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Thoughts on :foreign_key

December 8, 2010

Look at the models

class Topic < ActiveRecord::Base
  belongs_to :group
  belongs_to :creator, :class_name => "User"
  has_many :comments, :as => :commentable

class User < ActiveRecord::Base
  has_many :topics, :foreign_key => :creator_id

Now Topic has a field – creator_id meat to be used to point to the user who created the topic.

Thing is, I just did not expect has_many to need the :foreign_key specified to it. I expected Topic to need it. But theoretically, the foreign key can be deduced from the ‘belongs_to :creator’. so it is not required in the Topic model. However, it is required in the User model as shown in the above code


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