method 
 foreign_key
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foreign_key(separate_class_name_and_id_with_underscore = true) public Creates a foreign key name from a class name. separate_class_name_and_id_with_underscore sets whether the method should put ‘_’ between the name and ‘id’.
'Message'.foreign_key # => "message_id" 'Message'.foreign_key(false) # => "messageid" 'Admin::Post'.foreign_key # => "post_id"

 
 
 