621f5565e9
property :casted_attribute, :cast_as => 'WithCastedModelMixin' A casted attribute now knows about its parent. (#casted_by to retrieve the parent's object)
119 lines
4.4 KiB
Ruby
119 lines
4.4 KiB
Ruby
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.cattr_accessor(:properties)
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base.class_eval <<-EOS, __FILE__, __LINE__
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@@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] = v.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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# TODO move the argument checking to the cast method for early crashes
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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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klass = ::CouchRest.constantize(target[0])
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self[property.name] = self[key].collect do |value|
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obj = ( (property.init_method == 'send') && 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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# Let people use :send as a Time parse arg
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self[property.name] = if ((property.init_method != 'send') && target == 'Time')
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Time.parse(self[property.init_method])
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else
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klass = ::CouchRest.constantize(target)
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klass.send(property.init_method, self[property.name])
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end
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self[key].casted_by = self if self[key].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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define_property(name, options) unless properties.map{|p| p.name}.include?(name.to_s)
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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] = true if options[:cast_as]
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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 |