module CFoundry::V2::ModelMagic::ToOne

Public Instance Methods

to_one(name, opts = {}) click to toggle source
# File lib/cfoundry/v2/model_magic/to_one.rb, line 3
def to_one(name, opts = {})
  to_one_relations[name] = opts

  association_name = opts[:as] || name
  default = opts[:default]

  if has_default = opts.key?(:default)
    defaults[:"#{name}_guid"] = default
  end

  #
  # def MODEL
  #
  define_method(name) do
    return @cache[name] if @cache.key?(name)
    return @client.send(association_name) unless persisted?

    @cache[name] =
      if @manifest && @manifest[:entity].key?(name)
        @client.send(:"make_#{association_name}", @manifest[:entity][name])
      elsif url = send("#{name}_url")
        @client.send(:"#{association_name}_from", url)
      else
        default
      end
  end

  #
  # def create_MODEL
  #
  define_method("create_#{name}") do |*args|
    associated_instance = @client.send(:"#{association_name}")
    args.first.each do |name, value|
      associated_instance.send("#{name}=", value)
    end if args.first.is_a? Hash

    associated_instance.create!
    self.send("#{name}=", associated_instance)
  end

  #
  # def MODEL_url
  #
  define_method(:"#{name}_url") do
    manifest[:entity][:"#{name}_url"]
  end

  #
  # def MODEL=
  #
  define_method(:"#{name}=") do |assigned_value|
    klass = self.class.objects[association_name]

    unless has_default && assigned_value == default
      CFoundry::Validator.validate_type(assigned_value, klass)
    end

    @manifest ||= {}
    @manifest[:entity] ||= {}

    old_guid = @manifest[:entity][:"#{name}_guid"]
    association_guid = assigned_value ? assigned_value.guid : nil

    if old_guid != (association_guid)
      old_obj =
        @cache[name] || klass.new(@client, old_guid, @manifest[:entity][name])

      @changes[name] = [old_obj, assigned_value]
    end

    @cache[name] = assigned_value

    @manifest[:entity][:"#{name}_guid"] = association_guid
    @diff[:"#{name}_guid"] = association_guid
    assigned_value
  end
end