Module: PolymorphicIdentity

Defined in:
lib/polymorphic_identity.rb

Overview

Adds dynamic attributes for polymorphic associations based on the name of the class for the polymorphic record. For example,

class Tag < ActiveRecord::Base
  belongs_to :taggable, :polymorphic => true
end

class Article < ActiveRecord::Base
  has_many :tags, :as => :taggable
end

t = Tag.find(1)   # => #<Tag id: 1, taggable_id: 1, taggable_type: "Article">
t.taggable        # => #<Article id: 1>
t.article         # => #<Article id: 1>

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object

:nodoc:



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# File 'lib/polymorphic_identity.rb', line 16

def self.included(base) #:nodoc:
  base.class_eval do
    alias_method_chain :method_missing, :polymorphic_identity
    alias_method_chain :respond_to?, :polymorphic_identity
  end
end

Instance Method Details

#method_missing_with_polymorphic_identity(method_id, *args, &block) ⇒ Object

:nodoc:



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# File 'lib/polymorphic_identity.rb', line 23

def method_missing_with_polymorphic_identity(method_id, *args, &block) #:nodoc:
  if association_name = find_polymorphic_association_name(method_id)
    send(association_name, *args, &block)
  else
    method_missing_without_polymorphic_identity(method_id, *args, &block)
  end
end

#respond_to_with_polymorphic_identity?(method, include_priv = false) ⇒ Boolean

True if a polymorphic association can be found whose foreign type is set to the name of the method

Returns:

  • (Boolean) 


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# File 'lib/polymorphic_identity.rb', line 33

def respond_to_with_polymorphic_identity?(method, include_priv = false) #:nodoc:
  respond_to_without_polymorphic_identity?(method, include_priv) || !find_polymorphic_association_name(method).nil?
end