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