How to add foreign key in rails migration with different table name

Question

How can I assign different table name with adding foreign key. for e.g

I have a model like

class MyPost < ActiveRecord::Base
  has_many :comments, cla         


        

Answer 1

It should look like this:

class CreatePostComments < ActiveRecord::Migration
  def change
    create_table :post_comments do |t|
     t.belongs_to :post, index: true
     t.timestamps null: false
    end
    add_foreign_key :post_comments, :my_posts, column: :post_id
  end
end 

Take a look at the documentation: http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/add_foreign_key

You use the column option when the column is named differently.