couchrest_model/lib/couchrest/mixins/validation.rb
2009-02-20 15:34:49 -08:00

235 lines
8.3 KiB
Ruby

# 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.
class Object
def validatable?
false
end
end
require 'pathname'
require File.join(File.dirname(__FILE__), '..', 'support', 'class')
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, 'auto_validate')
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')
require File.join(dir, 'validators', 'confirmation_validator')
module CouchRest
module Validation
def self.included(base)
base.cattr_accessor(:auto_validation)
base.class_eval <<-EOS, __FILE__, __LINE__
# Turn off auto validation by default
@@auto_validation = false
# Force the auto validation for the class properties
# This feature is still not fully ported over,
# test are lacking, so please use with caution
def self.auto_validate!
self.auto_validation = true
end
EOS
base.extend(ClassMethods)
base.class_eval <<-EOS, __FILE__, __LINE__
if method_defined?(:_run_save_callbacks)
save_callback :before, :check_validations
end
EOS
base.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
def self.define_property(name, options={})
super
auto_generate_validations(properties.last)
autovalidation_check = true
end
RUBY_EVAL
end
# Ensures the object is valid for the context provided, and otherwise
# throws :halt and returns false.
#
def check_validations(context = :default)
throw(:halt, false) unless context.nil? || valid?(context)
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 Object property, if it exists.
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.merge!(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.to_sym, 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