72 lines
2.2 KiB
Ruby
72 lines
2.2 KiB
Ruby
require 'active_support/concern'
|
|
require 'active_support/inflector'
|
|
|
|
module ActiveModel
|
|
# == Active Model Conversions
|
|
#
|
|
# Handles default conversions: to_model, to_key, to_param, and to_partial_path.
|
|
#
|
|
# Let's take for example this non-persisted object.
|
|
#
|
|
# class ContactMessage
|
|
# include ActiveModel::Conversion
|
|
#
|
|
# # ContactMessage are never persisted in the DB
|
|
# def persisted?
|
|
# false
|
|
# end
|
|
# end
|
|
#
|
|
# cm = ContactMessage.new
|
|
# cm.to_model == self # => true
|
|
# cm.to_key # => nil
|
|
# cm.to_param # => nil
|
|
# cm.to_path # => "contact_messages/contact_message"
|
|
#
|
|
module Conversion
|
|
extend ActiveSupport::Concern
|
|
|
|
# If your object is already designed to implement all of the Active Model
|
|
# you can use the default <tt>:to_model</tt> implementation, which simply
|
|
# returns self.
|
|
#
|
|
# If your model does not act like an Active Model object, then you should
|
|
# define <tt>:to_model</tt> yourself returning a proxy object that wraps
|
|
# your object with Active Model compliant methods.
|
|
def to_model
|
|
self
|
|
end
|
|
|
|
# Returns an Enumerable of all key attributes if any is set, regardless
|
|
# if the object is persisted or not.
|
|
def to_key
|
|
key = respond_to?(:id) && id
|
|
key ? [key] : nil
|
|
end
|
|
|
|
# Returns a string representing the object's key suitable for use in URLs,
|
|
# or nil if <tt>persisted?</tt> is false.
|
|
def to_param
|
|
persisted? ? to_key.join('-') : nil
|
|
end
|
|
|
|
# Returns a string identifying the path associated with the object.
|
|
# ActionPack uses this to find a suitable partial to represent the object.
|
|
def to_partial_path
|
|
self.class._to_partial_path
|
|
end
|
|
|
|
module ClassMethods #:nodoc:
|
|
# Provide a class level cache for the to_path. This is an
|
|
# internal method and should not be accessed directly.
|
|
def _to_partial_path #:nodoc:
|
|
@_to_partial_path ||= begin
|
|
element = ActiveSupport::Inflector.underscore(ActiveSupport::Inflector.demodulize(self))
|
|
collection = ActiveSupport::Inflector.tableize(self)
|
|
"#{collection}/#{element}".freeze
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|