129 lines
5 KiB
Ruby
129 lines
5 KiB
Ruby
require 'time'
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require File.join(File.dirname(__FILE__), '..', 'more', 'property')
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module CouchRest
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module Mixins
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module Properties
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class IncludeError < StandardError; end
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def self.included(base)
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base.class_eval <<-EOS, __FILE__, __LINE__
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extlib_inheritable_accessor(:properties)
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self.properties ||= []
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EOS
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base.extend(ClassMethods)
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raise CouchRest::Mixins::Properties::IncludeError, "You can only mixin Properties in a class responding to [] and []=, if you tried to mixin CastedModel, make sure your class inherits from Hash or responds to the proper methods" unless (base.new.respond_to?(:[]) && base.new.respond_to?(:[]=))
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end
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def apply_defaults
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return unless self.respond_to?(:new_document?) && new_document?
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return unless self.class.respond_to?(:properties)
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return if self.class.properties.empty?
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# TODO: cache the default object
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self.class.properties.each do |property|
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key = property.name.to_s
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# let's make sure we have a default and we can assign the value
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if property.default && (self.respond_to?("#{key}=") || self.key?(key))
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if property.default.class == Proc
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self[key] = property.default.call
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else
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self[key] = Marshal.load(Marshal.dump(property.default))
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end
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end
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end
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end
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def cast_keys
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return unless self.class.properties
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self.class.properties.each do |property|
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next unless property.casted
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key = self.has_key?(property.name) ? property.name : property.name.to_sym
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target = property.type
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if target.is_a?(Array)
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next unless self[key]
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klass = ::CouchRest.constantize(target[0])
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self[property.name] = self[key].collect do |value|
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# Auto parse Time objects
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obj = ( (property.init_method == 'new') && klass == Time) ? Time.parse(value) : klass.send(property.init_method, value)
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obj.casted_by = self if obj.respond_to?(:casted_by)
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obj
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end
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else
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# Auto parse Time objects
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self[property.name] = if ((property.init_method == 'new') && target == 'Time')
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self[key].is_a?(String) ? Time.parse(self[key].dup) : self[key]
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else
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# Let people use :send as a Time parse arg
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klass = ::CouchRest.constantize(target)
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# I'm not convince we should or should not create a new instance if we are casting a doc/extended doc without default value and nothing was passed
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# unless (property.casted &&
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# (klass.superclass == CouchRest::ExtendedDocument || klass.superclass == CouchRest::Document) &&
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# (self[key].nil? || property.default.nil?))
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klass.send(property.init_method, self[key])
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#end
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end
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self[property.name].casted_by = self if self[property.name].respond_to?(:casted_by)
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end
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end
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end
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module ClassMethods
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def property(name, options={})
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existing_property = self.properties.find{|p| p.name == name.to_s}
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if existing_property.nil? || (existing_property.default != options[:default])
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define_property(name, options)
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end
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end
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protected
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# This is not a thread safe operation, if you have to set new properties at runtime
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# make sure to use a mutex.
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def define_property(name, options={})
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# check if this property is going to casted
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options[:casted] = options[:cast_as] ? options[:cast_as] : false
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property = CouchRest::Property.new(name, (options.delete(:cast_as) || options.delete(:type)), options)
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create_property_getter(property)
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create_property_setter(property) unless property.read_only == true
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properties << property
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end
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# defines the getter for the property (and optional aliases)
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def create_property_getter(property)
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# meth = property.name
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class_eval <<-EOS, __FILE__, __LINE__
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def #{property.name}
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self['#{property.name}']
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end
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EOS
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if property.alias
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class_eval <<-EOS, __FILE__, __LINE__
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alias #{property.alias.to_sym} #{property.name.to_sym}
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EOS
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end
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end
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# defines the setter for the property (and optional aliases)
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def create_property_setter(property)
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meth = property.name
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class_eval <<-EOS
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def #{meth}=(value)
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self['#{meth}'] = value
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end
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EOS
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if property.alias
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class_eval <<-EOS
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alias #{property.alias.to_sym}= #{meth.to_sym}=
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EOS
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end
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end
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end # module ClassMethods
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end
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end
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end |