Class: SimplyCouch::Model::BelongsTo::Property

Inherits:
Object
  • Object
show all
Defined in:
lib/simply_couch/model/belongs_to.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(owner_clazz, name, options = {}) ⇒ Property

Returns a new instance of Property.



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# File 'lib/simply_couch/model/belongs_to.rb', line 63

def initialize(owner_clazz, name, options = {})
  @name = name
  @options = {
    :class_name => owner_clazz.find_association_class_name(name)
  }.update(options)

  @options.assert_valid_keys(:class_name)

  owner_clazz.class_eval do
    property :"#{name}_id"
    alias_method :"#{name}_changed?", :"#{name}_id_changed?"

    define_method name do |*args|
      local_options = args.last.is_a?(Hash) ? args.last : {}
      local_options.assert_valid_keys(:force_reload, :with_deleted)
      forced_reload = local_options[:force_reload] || false
      with_deleted = local_options[:with_deleted] || false

      return instance_variable_get("@#{name}") unless instance_variable_get("@#{name}").nil? or forced_reload

      if send("#{name}_id").present?
        # Try to fetch the object. Does not have to be present. When relation dependency is ignore, the id remains.
        # This will result in a id to a non existent object. Therefore the rescue for object
        object = self.class.get_class_from_name(name).find(send("#{name}_id"), :with_deleted => with_deleted) rescue nil
        instance_variable_set("@#{name}",  object)
      else
        instance_variable_set("@#{name}",  nil)
      end
    end

    define_method "#{name}=" do |value|
      klass = self.class.get_class_from_name(name)
      raise ArgumentError, "expected #{klass} got #{value.class}" unless value.nil? || value.is_a?(klass)

      if value
        # Has many object update
        value_has_many_name = klass.properties.find{|p| p.is_a?(SimplyCouch::Model::HasMany::Property) && p.options[:class_name] == self.class.name}.try(:name)
        value.send(value_has_many_name) << self unless !value_has_many_name || value.send(value_has_many_name).include?(self)

        # Has one object update
        value_has_one_name = klass.properties.find{|p| p.is_a?(SimplyCouch::Model::HasOne::Property) && p.options[:class_name] == self.class.name}.try(:name)
        value.instance_variable_set("@#{value_has_one_name}", self) unless !value_has_one_name || value.send(value_has_one_name) == self
      end

      # Mark changed if appropriate
      # send("#{name}_will_change!") if value != instance_variable_get("@#{name}") is not a persisted property, do not mark as changed

      instance_variable_set("@#{name}", value)
      if value.nil?
        send("#{name}_id=", nil)
      else
        send("#{name}_id=", value.id)
      end
    end

    define_method "#{name}_id=" do |new_foreign_id|
      super(new_foreign_id)
      value = instance_variable_get("@#{name}")
      remove_instance_variable("@#{name}") if instance_variable_defined?("@#{name}") && new_foreign_id != value.try(:id)
    end
  end
end

Instance Attribute Details

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/simply_couch/model/belongs_to.rb', line 61

def name
  @name
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/simply_couch/model/belongs_to.rb', line 61

def options
  @options
end

Instance Method Details

#association? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/simply_couch/model/belongs_to.rb', line 134

def association?
  true
end

#build(object, json) ⇒ Object 



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# File 'lib/simply_couch/model/belongs_to.rb', line 125

def build(object, json)
  object.send "#{name}_id=", json["#{name}_id"]
end

#serialize(json, object) ⇒ Object Also known as: value 



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# File 'lib/simply_couch/model/belongs_to.rb', line 129

def serialize(json, object)
  json["#{name}_id"] = object.send("#{name}_id") if object.send("#{name}_id")
end