Started added a validation mixin

Usage:
  class Invoice < CouchRest::ExtendedDocument
    include CouchRest::Validation

    property :client_name
    property :employee_name
    property :location

    # Validation
    validates_present :client_name, :employee_name
    validates_present :location, :message => "Hey stupid!, you forgot the location"

  end

lib/couchrest/mixins/extended_document_mixins.rb

@@ -1,4 +1,5 @@
 require File.join(File.dirname(__FILE__), 'properties')
 require File.join(File.dirname(__FILE__), 'document_queries')
 require File.join(File.dirname(__FILE__), 'views')
-require File.join(File.dirname(__FILE__), 'design_doc')
+require File.join(File.dirname(__FILE__), 'design_doc')
+require File.join(File.dirname(__FILE__), 'validation')

lib/couchrest/mixins/validation.rb

@@ -0,0 +1,203 @@
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+require 'rubygems'
+require 'pathname'
+
+class Object
+  def validatable?
+    false
+  end
+end
+
+dir = File.join(Pathname(__FILE__).dirname.expand_path, '..', 'validation')
+
+require File.join(dir, 'validation_errors')
+require File.join(dir, 'contextual_validators')
+
+require File.join(dir, 'validators', 'generic_validator')
+require File.join(dir, 'validators', 'required_field_validator')
+require File.join(dir, 'validators', 'absent_field_validator')
+require File.join(dir, 'validators', 'format_validator')
+require File.join(dir, 'validators', 'length_validator')
+require File.join(dir, 'validators', 'numeric_validator')
+require File.join(dir, 'validators', 'method_validator')
+
+module CouchRest
+  module Validation
+    
+    def self.included(base)
+      base.extend(ClassMethods)
+    end
+
+    # Return the ValidationErrors
+    #
+    def errors
+      @errors ||= ValidationErrors.new
+    end
+
+    # Mark this resource as validatable. When we validate associations of a
+    # resource we can check if they respond to validatable? before trying to
+    # recursivly validate them
+    #
+    def validatable?
+      true
+    end
+
+    # Alias for valid?(:default)
+    #
+    def valid_for_default?
+      valid?(:default)
+    end
+
+    # Check if a resource is valid in a given context
+    #
+    def valid?(context = :default)
+      self.class.validators.execute(context, self)
+    end
+
+    # Begin a recursive walk of the model checking validity
+    #
+    def all_valid?(context = :default)
+      recursive_valid?(self, context, true)
+    end
+
+    # Do recursive validity checking
+    #
+    def recursive_valid?(target, context, state)
+      valid = state
+      target.instance_variables.each do |ivar|
+        ivar_value = target.instance_variable_get(ivar)
+        if ivar_value.validatable?
+          valid = valid && recursive_valid?(ivar_value, context, valid)
+        elsif ivar_value.respond_to?(:each)
+          ivar_value.each do |item|
+            if item.validatable?
+              valid = valid && recursive_valid?(item, context, valid)
+            end
+          end
+        end
+      end
+      return valid && target.valid?
+    end
+
+
+    def validation_property_value(name)
+      self.respond_to?(name, true) ? self.send(name) : nil
+    end
+
+    # Get the corresponding Resource property, if it exists.
+    #
+    # Note: CouchRest validations can be used on non-CouchRest resources.
+    # In such cases, the return value will be nil.
+    def validation_property(field_name)
+      properties.find{|p| p.name == field_name}
+    end
+
+    module ClassMethods
+      include CouchRest::Validation::ValidatesPresent
+      include CouchRest::Validation::ValidatesAbsent
+      # include CouchRest::Validation::ValidatesIsConfirmed
+      # include CouchRest::Validation::ValidatesIsPrimitive
+      # include CouchRest::Validation::ValidatesIsAccepted
+      include CouchRest::Validation::ValidatesFormat
+      include CouchRest::Validation::ValidatesLength
+      # include CouchRest::Validation::ValidatesWithin
+      include CouchRest::Validation::ValidatesIsNumber
+      include CouchRest::Validation::ValidatesWithMethod
+      # include CouchRest::Validation::ValidatesWithBlock
+      # include CouchRest::Validation::ValidatesIsUnique
+      # include CouchRest::Validation::AutoValidate
+
+      # Return the set of contextual validators or create a new one
+      #
+      def validators
+        @validations ||= ContextualValidators.new
+      end
+      
+      # Clean up the argument list and return a opts hash, including the
+      # merging of any default opts. Set the context to default if none is
+      # provided. Also allow :context to be aliased to :on, :when & group
+      #
+      def opts_from_validator_args(args, defaults = nil)
+        opts = args.last.kind_of?(Hash) ? args.pop : {}
+        context = :default
+        context = opts[:context] if opts.has_key?(:context)
+        context = opts.delete(:on) if opts.has_key?(:on)
+        context = opts.delete(:when) if opts.has_key?(:when)
+        context = opts.delete(:group) if opts.has_key?(:group)
+        opts[:context] = context
+        opts.mergs!(defaults) unless defaults.nil?
+        opts
+      end
+      
+      # Given a new context create an instance method of
+      # valid_for_<context>? which simply calls valid?(context)
+      # if it does not already exist
+      #
+      def create_context_instance_methods(context)
+        name = "valid_for_#{context.to_s}?"           # valid_for_signup?
+        if !self.instance_methods.include?(name)
+          class_eval <<-EOS, __FILE__, __LINE__
+            def #{name}                               # def valid_for_signup?
+              valid?('#{context.to_s}'.to_sym)        #   valid?('signup'.to_sym)
+            end                                       # end
+          EOS
+        end
+
+        all = "all_valid_for_#{context.to_s}?"        # all_valid_for_signup?
+        if !self.instance_methods.include?(all)
+          class_eval <<-EOS, __FILE__, __LINE__
+            def #{all}                                # def all_valid_for_signup?
+              all_valid?('#{context.to_s}'.to_sym)    #   all_valid?('signup'.to_sym)
+            end                                       # end
+          EOS
+        end
+      end
+
+      # Create a new validator of the given klazz and push it onto the
+      # requested context for each of the attributes in the fields list
+      #
+      def add_validator_to_context(opts, fields, klazz)
+        fields.each do |field|
+          validator = klazz.new(field, opts)
+          if opts[:context].is_a?(Symbol)
+            unless validators.context(opts[:context]).include?(validator)
+              validators.context(opts[:context]) << validator
+              create_context_instance_methods(opts[:context])
+            end
+          elsif opts[:context].is_a?(Array)
+            opts[:context].each do |c|
+              unless validators.context(c).include?(validator)
+                validators.context(c) << validator
+                create_context_instance_methods(c)
+              end
+            end
+          end
+        end
+      end
+      
+    end # module ClassMethods
+  end # module Validation
+
+end # module CouchRest

lib/couchrest/mixins/views.rb

@@ -0,0 +1,169 @@
+module CouchRest
+  module Mixins
+    module Views
+      
+      def self.included(base)
+        base.extend(ClassMethods)
+        # extlib is required for the following code
+        base.send(:class_inheritable_accessor, :design_doc)
+        base.send(:class_inheritable_accessor, :design_doc_slug_cache)
+        base.send(:class_inheritable_accessor, :design_doc_fresh)
+      end
+      
+      module ClassMethods
+        
+        # Define a CouchDB view. The name of the view will be the concatenation
+        # of <tt>by</tt> and the keys joined by <tt>_and_</tt>
+        #  
+        # ==== Example views:
+        #  
+        #   class Post
+        #     # view with default options
+        #     # query with Post.by_date
+        #     view_by :date, :descending => true
+        #  
+        #     # view with compound sort-keys
+        #     # query with Post.by_user_id_and_date
+        #     view_by :user_id, :date
+        #  
+        #     # view with custom map/reduce functions
+        #     # query with Post.by_tags :reduce => true
+        #     view_by :tags,                                                
+        #       :map =>                                                     
+        #         "function(doc) {                                          
+        #           if (doc['couchrest-type'] == 'Post' && doc.tags) {                   
+        #             doc.tags.forEach(function(tag){                       
+        #               emit(doc.tag, 1);                                   
+        #             });                                                   
+        #           }                                                       
+        #         }",                                                       
+        #       :reduce =>                                                  
+        #         "function(keys, values, rereduce) {                       
+        #           return sum(values);                                     
+        #         }"                                                        
+        #   end
+        #  
+        # <tt>view_by :date</tt> will create a view defined by this Javascript
+        # function:
+        #  
+        #   function(doc) {
+        #     if (doc['couchrest-type'] == 'Post' && doc.date) {
+        #       emit(doc.date, null);
+        #     }
+        #   }
+        #  
+        # It can be queried by calling <tt>Post.by_date</tt> which accepts all
+        # valid options for CouchRest::Database#view. In addition, calling with
+        # the <tt>:raw => true</tt> option will return the view rows
+        # themselves. By default <tt>Post.by_date</tt> will return the
+        # documents included in the generated view.
+        #  
+        # CouchRest::Database#view options can be applied at view definition
+        # time as defaults, and they will be curried and used at view query
+        # time. Or they can be overridden at query time.
+        #  
+        # Custom views can be queried with <tt>:reduce => true</tt> to return
+        # reduce results. The default for custom views is to query with
+        # <tt>:reduce => false</tt>.
+        #  
+        # Views are generated (on a per-model basis) lazily on first-access.
+        # This means that if you are deploying changes to a view, the views for
+        # that model won't be available until generation is complete. This can
+        # take some time with large databases. Strategies are in the works.
+        #  
+        # To understand the capabilities of this view system more compeletly,
+        # it is recommended that you read the RSpec file at
+        # <tt>spec/core/model_spec.rb</tt>.
+
+        def view_by(*keys)
+          self.design_doc ||= Design.new(default_design_doc)
+          opts = keys.pop if keys.last.is_a?(Hash)
+          opts ||= {}
+          ducktype = opts.delete(:ducktype)
+          unless ducktype || opts[:map]
+            opts[:guards] ||= []
+            opts[:guards].push "(doc['couchrest-type'] == '#{self.to_s}')"
+          end
+          keys.push opts
+          self.design_doc.view_by(*keys)
+          self.design_doc_fresh = false
+        end
+
+        # returns stored defaults if the there is a view named this in the design doc
+        def has_view?(view)
+          view = view.to_s
+          design_doc && design_doc['views'] && design_doc['views'][view]
+        end
+
+        # Dispatches to any named view.
+        def view name, query={}, &block
+          unless design_doc_fresh
+            refresh_design_doc
+          end
+          query[:raw] = true if query[:reduce]        
+          raw = query.delete(:raw)
+          fetch_view_with_docs(name, query, raw, &block)
+        end
+
+        def all_design_doc_versions
+          database.documents :startkey => "_design/#{self.to_s}-", 
+            :endkey => "_design/#{self.to_s}-\u9999"
+        end
+
+        # Deletes any non-current design docs that were created by this class. 
+        # Running this when you're deployed version of your application is steadily 
+        # and consistently using the latest code, is the way to clear out old design 
+        # docs. Running it to early could mean that live code has to regenerate
+        # potentially large indexes.
+        def cleanup_design_docs!
+          ddocs = all_design_doc_versions
+          ddocs["rows"].each do |row|
+            if (row['id'] != design_doc_id)
+              database.delete_doc({
+                "_id" => row['id'],
+                "_rev" => row['value']['rev']
+              })
+            end
+          end
+        end
+
+        private
+
+        def fetch_view_with_docs name, opts, raw=false, &block
+          if raw
+            fetch_view name, opts, &block
+          else
+            begin
+              view = fetch_view name, opts.merge({:include_docs => true}), &block
+              view['rows'].collect{|r|new(r['doc'])} if view['rows']
+            rescue
+              # fallback for old versions of couchdb that don't 
+              # have include_docs support
+              view = fetch_view name, opts, &block
+              view['rows'].collect{|r|new(database.get(r['id']))} if view['rows']
+            end
+          end
+        end
+
+        def fetch_view view_name, opts, &block
+          retryable = true
+          begin
+            design_doc.view(view_name, opts, &block)
+            # the design doc could have been deleted by a rouge process
+          rescue RestClient::ResourceNotFound => e
+            if retryable
+              refresh_design_doc
+              retryable = false
+              retry
+            else
+              raise e
+            end
+          end
+        end
+        
+      end # module ClassMethods
+      
+      
+    end
+  end
+end

lib/couchrest/validation/contextual_validators.rb

@@ -0,0 +1,55 @@
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class ContextualValidators
+
+      def dump
+        contexts.each_pair do |key, context|
+          puts "Key=#{key} Context: #{context}"
+        end
+      end
+
+      # Get a hash of named context validators for the resource
+      #
+      # @return <Hash> a hash of validators <GenericValidator>
+      def contexts
+        @contexts ||= {}
+      end
+
+      # Return an array of validators for a named context
+      #
+      # @return <Array> An array of validators
+      def context(name)
+        contexts[name] ||= []
+      end
+
+      # Clear all named context validators off of the resource
+      #
+      def clear!
+        contexts.clear
+      end
+
+      # Execute all validators in the named context against the target
+      #
+      # @param <Symbol> named_context the context we are validating against
+      # @param <Object> target        the resource that we are validating
+      # @return <Boolean> true if all are valid, otherwise false
+      def execute(named_context, target)
+        raise(ArgumentError, 'invalid context specified') if !named_context || (contexts.length > 0 && !contexts[named_context])
+        target.errors.clear!
+        result = true
+        context(named_context).each do |validator|
+          next unless validator.execute?(target)
+          result = false unless validator.call(target)
+        end
+
+        result
+      end
+
+    end # module ContextualValidators
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validation_errors.rb

@@ -0,0 +1,118 @@
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class ValidationErrors
+
+      include Enumerable
+
+      @@default_error_messages = {
+        :absent => '%s must be absent',
+        :inclusion => '%s must be one of [%s]',
+        :invalid => '%s has an invalid format',
+        :confirmation => '%s does not match the confirmation',
+        :accepted  => "%s is not accepted",
+        :nil => '%s must not be nil',
+        :blank => '%s must not be blank',
+        :length_between => '%s must be between %s and %s characters long',
+        :too_long => '%s must be less than %s characters long',
+        :too_short => '%s must be more than %s characters long',
+        :wrong_length => '%s must be %s characters long',
+        :taken => '%s is already taken',
+        :not_a_number => '%s must be a number',
+        :not_an_integer => '%s must be an integer',
+        :greater_than => '%s must be greater than %s',
+        :greater_than_or_equal_to => "%s must be greater than or equal to %s",
+        :equal_to => "%s must be equal to %s",
+        :less_than => '%s must be less than %s',
+        :less_than_or_equal_to => "%s must be less than or equal to %s",
+        :value_between => '%s must be between %s and %s',
+        :primitive => '%s must be of type %s'
+      }
+
+      # Holds a hash with all the default error messages that can be replaced by your own copy or localizations.
+      cattr_writer :default_error_messages
+
+      def self.default_error_message(key, field, *values)
+        field = Extlib::Inflection.humanize(field)
+        @@default_error_messages[key] % [field, *values].flatten
+      end
+
+      # Clear existing validation errors.
+      def clear!
+        errors.clear
+      end
+
+      # Add a validation error. Use the field_name :general if the errors does
+      # not apply to a specific field of the Resource.
+      #
+      # @param <Symbol> field_name the name of the field that caused the error
+      # @param <String> message    the message to add
+      def add(field_name, message)
+        (errors[field_name] ||= []) << message
+      end
+
+      # Collect all errors into a single list.
+      def full_messages
+        errors.inject([]) do |list, pair|
+          list += pair.last
+        end
+      end
+
+      # Return validation errors for a particular field_name.
+      #
+      # @param <Symbol> field_name the name of the field you want an error for
+      def on(field_name)
+        errors_for_field = errors[field_name]
+        errors_for_field.blank? ? nil : errors_for_field
+      end
+
+      def each
+        errors.map.each do |k, v|
+          next if v.blank?
+          yield(v)
+        end
+      end
+
+      def empty?
+        entries.empty?
+      end
+
+      def method_missing(meth, *args, &block)
+        errors.send(meth, *args, &block)
+      end
+
+      private
+      def errors
+        @errors ||= {}
+      end
+
+    end # class ValidationErrors
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/absent_field_validator.rb

@@ -0,0 +1,75 @@
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    class AbsentFieldValidator < GenericValidator
+
+      def initialize(field_name, options={})
+        super
+        @field_name, @options = field_name, options
+      end
+
+      def call(target)
+        value = target.send(field_name)
+        return true if (value.nil? || (value.respond_to?(:empty?) && value.empty?))
+
+        error_message = @options[:message] || ValidationErrors.default_error_message(:absent, field_name)
+        add_error(target, error_message, field_name)
+
+        return false
+      end
+    end # class AbsentFieldValidator
+
+    module ValidatesAbsent
+
+      ##
+      #
+      # @example [Usage]
+      #   require 'dm-validations'
+      #
+      #   class Page
+      #
+      #     property :unwanted_attribute, String
+      #     property :another_unwanted, String
+      #     property :yet_again, String
+      #
+      #     validates_absent :unwanted_attribute
+      #     validates_absent :another_unwanted, :yet_again
+      #
+      #     # a call to valid? will return false unless
+      #     # all three attributes are blank
+      #   end
+      #
+      def validates_absent(*fields)
+        opts = opts_from_validator_args(fields)
+        add_validator_to_context(opts, fields, CouchRest::Validation::AbsentFieldValidator)
+      end
+
+    end # module ValidatesAbsent
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/format_validator.rb

@@ -0,0 +1,117 @@
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+require 'pathname'
+require Pathname(__FILE__).dirname.expand_path + 'formats/email'
+require Pathname(__FILE__).dirname.expand_path + 'formats/url'
+
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class FormatValidator < GenericValidator
+
+      FORMATS = {}
+      include CouchRest::Validation::Format::Email
+      include CouchRest::Validation::Format::Url
+
+      def initialize(field_name, options = {}, &b)
+        super(field_name, options)
+        @field_name, @options = field_name, options
+        @options[:allow_nil] = false unless @options.has_key?(:allow_nil)
+      end
+
+      def call(target)
+        value = target.validation_property_value(field_name)
+        return true if @options[:allow_nil] && value.nil?
+
+        validation = @options[:as] || @options[:with]
+
+        raise "No such predefined format '#{validation}'" if validation.is_a?(Symbol) && !FORMATS.has_key?(validation)
+        validator = validation.is_a?(Symbol) ? FORMATS[validation][0] : validation
+
+        valid = case validator
+          when Proc   then validator.call(value)
+          when Regexp then value =~ validator
+          else
+            raise UnknownValidationFormat, "Can't determine how to validate #{target.class}##{field_name} with #{validator.inspect}"
+        end
+
+        return true if valid
+
+        error_message = @options[:message] || ValidationErrors.default_error_message(:invalid, field_name)
+
+        field = Extlib::Inflection.humanize(field_name)
+        error_message = error_message.call(field, value) if error_message.respond_to?(:call)
+
+        add_error(target, error_message, field_name)
+
+        false
+      end
+
+      #class UnknownValidationFormat < StandardError; end
+
+    end # class FormatValidator
+
+    module ValidatesFormat
+
+      ##
+      # Validates that the attribute is in the specified format. You may use the
+      # :as (or :with, it's an alias) option to specify the pre-defined format
+      # that you want to validate against. You may also specify your own format
+      # via a Proc or Regexp passed to the the :as or :with options.
+      #
+      # @option :allow_nil<Boolean>         true/false (default is true)
+      # @option :as<Format, Proc, Regexp>   the pre-defined format, Proc or Regexp to validate against
+      # @option :with<Format, Proc, Regexp> an alias for :as
+      #
+      # @details [Pre-defined Formats]
+      #   :email_address (format is specified in DataMapper::Validation::Format::Email)
+      #   :url (format is specified in DataMapper::Validation::Format::Url)
+      #
+      # @example [Usage]
+      #
+      #   class Page
+      #
+      #     property :email, String
+      #     property :zip_code, String
+      #
+      #     validates_format :email, :as => :email_address
+      #     validates_format :zip_code, :with => /^\d{5}$/
+      #
+      #     # a call to valid? will return false unless:
+      #     # email is formatted like an email address
+      #     # and
+      #     # zip_code is a string of 5 digits
+      #
+      def validates_format(*fields)
+        opts = opts_from_validator_args(fields)
+        add_validator_to_context(opts, fields, CouchRest::Validation::FormatValidator)
+      end
+
+    end # module ValidatesFormat
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/formats/email.rb

@@ -0,0 +1,66 @@
+# encoding: binary
+
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module CouchRest
+  module Validation
+    module Format
+      module Email
+
+        def self.included(base)
+          CouchRest::Validation::FormatValidator::FORMATS.merge!(
+            :email_address => [ EmailAddress, lambda { |field, value| '%s is not a valid email address'.t(value) }]
+          )
+        end
+
+        # RFC2822 (No attribution reference available)
+        EmailAddress = begin
+            alpha = "a-zA-Z"
+            digit = "0-9"
+            atext = "[#{alpha}#{digit}\!\#\$\%\&\'\*+\/\=\?\^\_\`\{\|\}\~\-]"
+            dot_atom_text = "#{atext}+([.]#{atext}*)*"
+            dot_atom = "#{dot_atom_text}"
+            qtext = '[^\\x0d\\x22\\x5c\\x80-\\xff]'
+            text = "[\\x01-\\x09\\x11\\x12\\x14-\\x7f]"
+            quoted_pair = "(\\x5c#{text})"
+            qcontent = "(?:#{qtext}|#{quoted_pair})"
+            quoted_string = "[\"]#{qcontent}+[\"]"
+            atom = "#{atext}+"
+            word = "(?:#{atom}|#{quoted_string})"
+            obs_local_part = "#{word}([.]#{word})*"
+            local_part = "(?:#{dot_atom}|#{quoted_string}|#{obs_local_part})"
+            no_ws_ctl = "\\x01-\\x08\\x11\\x12\\x14-\\x1f\\x7f"
+            dtext = "[#{no_ws_ctl}\\x21-\\x5a\\x5e-\\x7e]"
+            dcontent = "(?:#{dtext}|#{quoted_pair})"
+            domain_literal = "\\[#{dcontent}+\\]"
+            obs_domain = "#{atom}([.]#{atom})*"
+            domain = "(?:#{dot_atom}|#{domain_literal}|#{obs_domain})"
+            addr_spec = "#{local_part}\@#{domain}"
+            pattern = /^#{addr_spec}$/
+        end
+
+      end # module Email
+    end # module Format
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/formats/url.rb

@@ -0,0 +1,43 @@
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module CouchRest
+  module Validation
+    module Format
+      module Url
+
+        def self.included(base)
+          CouchRest::Validation::FormatValidator::FORMATS.merge!(
+            :url => [ Url, lambda { |field, value| '%s is not a valid URL'.t(value) }]
+          )
+        end
+
+        Url = begin
+          # Regex from http://www.igvita.com/2006/09/07/validating-url-in-ruby-on-rails/
+          /(^$)|(^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$)/ix
+        end
+
+      end # module Url
+    end # module Format
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/generic_validator.rb

@@ -0,0 +1,120 @@
+# -*- coding: utf-8 -*-
+
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module CouchRest
+  module Validation
+
+    # All validators extend this base class. Validators must:
+    #
+    # * Implement the initialize method to capture its parameters, also calling
+    #   super to have this parent class capture the optional, general :if and
+    #   :unless parameters.
+    # * Implement the call method, returning true or false. The call method
+    #   provides the validation logic.
+    #
+    # @author Guy van den Berg
+    class GenericValidator
+
+      attr_accessor :if_clause, :unless_clause
+      attr_reader :field_name
+
+      # Construct a validator. Capture the :if and :unless clauses when present.
+      #
+      # @param field<String, Symbol> The property specified for validation
+      #
+      # @option :if<Symbol, Proc>   The name of a method or a Proc to call to
+      #                     determine if the validation should occur.
+      # @option :unless<Symbol, Proc> The name of a method or a Proc to call to
+      #                         determine if the validation should not occur
+      # All additional key/value pairs are passed through to the validator
+      # that is sub-classing this GenericValidator
+      #
+      def initialize(field, opts = {})
+        @if_clause     = opts.delete(:if)
+        @unless_clause = opts.delete(:unless)
+      end
+
+      # Add an error message to a target resource. If the error corresponds to a
+      # specific field of the resource, add it to that field, otherwise add it
+      # as a :general message.
+      #
+      # @param <Object> target the resource that has the error
+      # @param <String> message the message to add
+      # @param <Symbol> field_name the name of the field that caused the error
+      #
+      # TODO - should the field_name for a general message be :default???
+      #
+      def add_error(target, message, field_name = :general)
+        target.errors.add(field_name, message)
+      end
+
+      # Call the validator. "call" is used so the operation is BoundMethod and
+      # Block compatible. This must be implemented in all concrete classes.
+      #
+      # @param <Object> target  the resource that the validator must be called
+      #                         against
+      # @return <Boolean> true if valid, otherwise false
+      def call(target)
+        raise NotImplementedError, "CouchRest::Validation::GenericValidator::call must be overriden in a subclass"
+      end
+
+      # Determines if this validator should be run against the
+      # target by evaluating the :if and :unless clauses
+      # optionally passed while specifying any validator.
+      #
+      # @param <Object> target the resource that we check against
+      # @return <Boolean> true if should be run, otherwise false
+      def execute?(target)
+        if unless_clause = self.unless_clause
+          if unless_clause.is_a?(Symbol)
+            return false if target.send(unless_clause)
+          elsif unless_clause.respond_to?(:call)
+            return false if unless_clause.call(target)
+          end
+        end
+
+        if if_clause = self.if_clause
+          if if_clause.is_a?(Symbol)
+            return target.send(if_clause)
+          elsif if_clause.respond_to?(:call)
+            return if_clause.call(target)
+          end
+        end
+
+        true
+      end
+
+      def ==(other)
+        self.class == other.class &&
+        self.field_name == other.field_name &&
+        self.class == other.class &&
+        self.if_clause == other.if_clause &&
+        self.unless_clause == other.unless_clause &&
+        self.instance_variable_get(:@options) == other.instance_variable_get(:@options)
+      end
+
+    end # class GenericValidator
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/length_validator.rb

@@ -0,0 +1,134 @@
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class LengthValidator < GenericValidator
+
+      def initialize(field_name, options)
+        super
+        @field_name = field_name
+        @options = options
+
+        @min = options[:minimum] || options[:min]
+        @max = options[:maximum] || options[:max]
+        @equal = options[:is] || options[:equals]
+        @range = options[:within] || options[:in]
+
+        @validation_method ||= :range if @range
+        @validation_method ||= :min if @min && @max.nil?
+        @validation_method ||= :max if @max && @min.nil?
+        @validation_method ||= :equals unless @equal.nil?
+      end
+
+      def call(target)
+        field_value = target.validation_property_value(field_name)
+        return true if @options[:allow_nil] && field_value.nil?
+
+        field_value = '' if field_value.nil?
+
+        # XXX: HACK seems hacky to do this on every validation, probably should
+        #      do this elsewhere?
+        field = Extlib::Inflection.humanize(field_name)
+        min = @range ? @range.min : @min
+        max = @range ? @range.max : @max
+        equal = @equal
+
+        case @validation_method
+        when :range then
+          unless valid = @range.include?(field_value.size)
+            error_message = ValidationErrors.default_error_message(:length_between, field, min, max)
+          end
+        when :min then
+          unless valid = field_value.size >= min
+            error_message = ValidationErrors.default_error_message(:too_short, field, min)
+          end
+        when :max then
+          unless valid = field_value.size <= max
+            error_message = ValidationErrors.default_error_message(:too_long, field, max)
+          end
+        when :equals then
+          unless valid = field_value.size == equal
+            error_message = ValidationErrors.default_error_message(:wrong_length, field, equal)
+          end
+        end
+
+        error_message = @options[:message] || error_message
+
+        add_error(target, error_message, field_name) unless valid
+
+        return valid
+      end
+
+    end # class LengthValidator
+
+    module ValidatesLength
+
+      # Validates that the length of the attribute is equal to, less than,
+      # greater than or within a certain range (depending upon the options
+      # you specify).
+      #
+      # @option :allow_nil<Boolean> true/false (default is true)
+      # @option :minimum    ensures that the attribute's length is greater than
+      #   or equal to the supplied value
+      # @option :min        alias for :minimum
+      # @option :maximum    ensures the attribute's length is less than or equal
+      #   to the supplied value
+      # @option :max        alias for :maximum
+      # @option :equals     ensures the attribute's length is equal to the
+      #   supplied value
+      # @option :is         alias for :equals
+      # @option :in<Range>  given a Range, ensures that the attributes length is
+      #   include?'ed in the Range
+      # @option :within<Range>  alias for :in
+      #
+      # @example [Usage]
+      #
+      #   class Page
+      #
+      #     property high, Integer
+      #     property low, Integer
+      #     property just_right, Integer
+      #
+      #     validates_length :high, :min => 100000000000
+      #     validates_length :low, :equals => 0
+      #     validates_length :just_right, :within => 1..10
+      #
+      #     # a call to valid? will return false unless:
+      #     # high is greater than or equal to 100000000000
+      #     # low is equal to 0
+      #     # just_right is between 1 and 10 (inclusive of both 1 and 10)
+      #
+      def validates_length(*fields)
+        opts = opts_from_validator_args(fields)
+        add_validator_to_context(opts, fields, CouchRest::Validation::LengthValidator)
+      end
+
+    end # module ValidatesLength
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/method_validator.rb

@@ -0,0 +1,66 @@
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class MethodValidator < GenericValidator
+
+      def initialize(field_name, options={})
+        super
+        @field_name, @options = field_name, options.clone
+        @options[:method] = @field_name unless @options.has_key?(:method)
+      end
+
+      def call(target)
+        result, message = target.send(@options[:method])
+        add_error(target, message, field_name) unless result
+        result
+      end
+
+      def ==(other)
+        @options[:method] == other.instance_variable_get(:@options)[:method] && super
+      end
+    end # class MethodValidator
+
+    module ValidatesWithMethod
+
+      ##
+      # Validate using the given method. The method given needs to return:
+      # [result::<Boolean>, Error Message::<String>]
+      #
+      # @example [Usage]
+      #
+      #   class Page
+      #
+      #     property :zip_code, String
+      #
+      #     validates_with_method :in_the_right_location?
+      #
+      #     def in_the_right_location?
+      #       if @zip_code == "94301"
+      #         return true
+      #       else
+      #         return [false, "You're in the wrong zip code"]
+      #       end
+      #     end
+      #
+      #     # A call to valid? will return false and
+      #     # populate the object's errors with "You're in the
+      #     # wrong zip code" unless zip_code == "94301"
+      #
+      #     # You can also specify field:
+      #
+      #     validates_with_method :zip_code, :in_the_right_location?
+      #
+      #     # it will add returned error message to :zip_code field
+      #
+      def validates_with_method(*fields)
+        opts = opts_from_validator_args(fields)
+        add_validator_to_context(opts, fields, CouchRest::Validation::MethodValidator)
+      end
+
+    end # module ValidatesWithMethod
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/numeric_validator.rb

@@ -0,0 +1,81 @@
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class NumericValidator < GenericValidator
+
+      def initialize(field_name, options={})
+        super
+        @field_name, @options = field_name, options
+        @options[:integer_only] = false unless @options.has_key?(:integer_only)
+      end
+
+      def call(target)
+        value = target.send(field_name)
+        return true if @options[:allow_nil] && value.nil?
+
+        value = value.kind_of?(BigDecimal) ? value.to_s('F') : value.to_s
+
+        error_message = @options[:message]
+        precision     = @options[:precision]
+        scale         = @options[:scale]
+
+        if @options[:integer_only]
+          return true if value =~ /\A[+-]?\d+\z/
+          error_message ||= ValidationErrors.default_error_message(:not_an_integer, field_name)
+        else
+          # FIXME: if precision and scale are not specified, can we assume that it is an integer?
+          #        probably not, as floating point numbers don't have hard
+          #        defined scale. the scale floats with the length of the
+          #        integral and precision. Ie. if precision = 10 and integral
+          #        portion of the number is 9834 (4 digits), the max scale will
+          #        be 6 (10 - 4). But if the integral length is 1, max scale
+          #        will be (10 - 1) = 9, so 1.234567890.
+          if precision && scale
+            #handles both Float when it has scale specified and BigDecimal
+            if precision > scale && scale > 0
+              return true if value =~ /\A[+-]?(?:\d{1,#{precision - scale}}|\d{0,#{precision - scale}}\.\d{1,#{scale}})\z/
+            elsif precision > scale && scale == 0
+              return true if value =~ /\A[+-]?(?:\d{1,#{precision}}(?:\.0)?)\z/
+            elsif precision == scale
+              return true if value =~ /\A[+-]?(?:0(?:\.\d{1,#{scale}})?)\z/
+            else
+              raise ArgumentError, "Invalid precision #{precision.inspect} and scale #{scale.inspect} for #{field_name} (value: #{value.inspect} #{value.class})"
+            end
+          elsif precision && scale.nil?
+            # for floats, if scale is not set
+
+            #total number of digits is less or equal precision
+            return true if value.gsub(/[^\d]/, '').length <= precision
+
+            #number of digits before decimal == precision, and the number is x.0. same as scale = 0
+            return true if value =~ /\A[+-]?(?:\d{1,#{precision}}(?:\.0)?)\z/
+          else
+            return true if value =~ /\A[+-]?(?:\d+|\d*\.\d+)\z/
+          end
+          error_message ||= ValidationErrors.default_error_message(:not_a_number, field_name)
+        end
+
+        add_error(target, error_message, field_name)
+
+        # TODO: check the gt, gte, lt, lte, and eq options
+
+        return false
+      end
+    end # class NumericValidator
+
+    module ValidatesIsNumber
+
+      # Validate whether a field is numeric
+      #
+      def validates_is_number(*fields)
+        opts = opts_from_validator_args(fields)
+        add_validator_to_context(opts, fields, CouchRest::Validation::NumericValidator)
+      end
+
+    end # module ValidatesIsNumber
+  end # module Validation
+end # module CouchRest

lib/couchrest/validation/validators/required_field_validator.rb

@@ -0,0 +1,86 @@
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class RequiredFieldValidator < GenericValidator
+
+      def initialize(field_name, options={})
+        super
+        @field_name, @options = field_name, options
+      end
+
+      def call(target)
+        value = target.validation_property_value(field_name)
+        property = target.validation_property(field_name)
+        return true if present?(value, property)
+
+        error_message = @options[:message] || default_error(property)
+        add_error(target, error_message, field_name)
+
+        false
+      end
+
+      protected
+
+      # Boolean property types are considered present if non-nil.
+      # Other property types are considered present if non-blank.
+      # Non-properties are considered present if non-blank.
+      def present?(value, property)
+        boolean_type?(property) ? !value.nil? : !value.blank?
+      end
+
+      def default_error(property)
+        actual = boolean_type?(property) ? :nil : :blank
+        ValidationErrors.default_error_message(actual, field_name)
+      end
+
+      # Is +property+ a boolean property?
+      #
+      # Returns true for Boolean, ParanoidBoolean, TrueClass, etc. properties.
+      # Returns false for other property types.
+      # Returns false for non-properties.
+      def boolean_type?(property)
+        property ? property.primitive == TrueClass : false
+      end
+
+    end # class RequiredFieldValidator
+
+    module ValidatesPresent
+
+      ##
+      # Validates that the specified attribute is present.
+      #
+      # For most property types "being present" is the same as being "not
+      # blank" as determined by the attribute's #blank? method. However, in
+      # the case of Boolean, "being present" means not nil; i.e. true or
+      # false.
+      #
+      # @note
+      #   dm-core's support lib adds the blank? method to many classes,
+      # @see lib/dm-core/support/blank.rb (dm-core) for more information.
+      #
+      # @example [Usage]
+      #
+      #   class Page
+      #
+      #     property :required_attribute, String
+      #     property :another_required, String
+      #     property :yet_again, String
+      #
+      #     validates_present :required_attribute
+      #     validates_present :another_required, :yet_again
+      #
+      #     # a call to valid? will return false unless
+      #     # all three attributes are !blank?
+      #   end
+      def validates_present(*fields)
+        opts = opts_from_validator_args(fields)
+        add_validator_to_context(opts, fields, CouchRest::Validation::RequiredFieldValidator)
+      end
+
+    end # module ValidatesPresent
+  end # module Validation
+end # module CouchRest

spec/couchrest/more/property_spec.rb

@@ -2,6 +2,7 @@ require File.join(File.dirname(__FILE__), '..', '..', 'spec_helper')
 
 # check the following file to see how to use the spec'd features.
 require File.join(FIXTURE_PATH, 'more', 'card')
+require File.join(FIXTURE_PATH, 'more', 'invoice')
 
 describe "ExtendedDocument properties" do
   
@@ -33,11 +34,37 @@ describe "ExtendedDocument properties" do
     @card.family_name.should == @card.last_name
   end
   
-  it "should be able to be validated" do
-    pending("need to add validation") do
+  describe "validation" do
+    
+    before(:each) do
+      @invoice = Invoice.new(:client_name => "matt", :employee_name => "Chris", :location => "San Diego, CA")
+    end
+    
+    it "should be able to be validated" do
       @card.should be_valid
     end
-    #Card.property(:company, :required => true)
+    
+    it "should let you validate the presence of an attribute" do
+      @card.first_name = nil
+      @card.should_not be_valid
+      @card.errors.should_not be_empty
+      @card.errors.on(:first_name).should == ["First name must not be blank"]
+    end
+    
+    it "should validate the presence of 2 attributes" do
+      @invoice.clear
+      @invoice.should_not be_valid
+      @invoice.errors.should_not be_empty
+      @invoice.errors.on(:client_name).should == ["Client name must not be blank"]
+      @invoice.errors.on(:employee_name).should_not be_empty
+    end
+    
+    it "should let you set an error message" do
+      @invoice.location = nil
+      @invoice.valid?
+      @invoice.errors.on(:location).first.should == "Hey stupid!, you forgot the location"
+    end
+  
   end
   
 end

spec/fixtures/more/card.rb

@@ -1,7 +1,16 @@
 class Card < CouchRest::ExtendedDocument  
+  # Include the validation module to get access to the validation methods
+  include CouchRest::Validation
+  
+  # Set the default database to use
   use_database TEST_SERVER.default_database
+  
+  # Official Schema
   property :first_name
   property :last_name,        :alias     => :family_name
   property :read_only_value,  :read_only => true
   
+  # Validation
+  validates_present :first_name
+  
 end

spec/fixtures/more/invoice.rb

@@ -0,0 +1,17 @@
+class Invoice < CouchRest::ExtendedDocument  
+  # Include the validation module to get access to the validation methods
+  include CouchRest::Validation
+  
+  # Set the default database to use
+  use_database TEST_SERVER.default_database
+  
+  # Official Schema
+  property :client_name
+  property :employee_name
+  property :location
+  
+  # Validation
+  validates_present :client_name, :employee_name
+  validates_present :location, :message => "Hey stupid!, you forgot the location"
+  
+end