Create a primary key for a table without one in migration

Question

I've created table

create_table :friendships , :force => true, :id => false do |t|
  t.integer :person_id
  t.integer :friend_id
end

Now i need to create id for that table. how can i do that in migration?

minute after i've asked i found an answer http://stackoverflow.com/questions/5328528/how-do-i-retroactively-add-a-primary-key-to-my-table-in-rails — Elmor, Nov 20 '12 at 09:57
so please post your answer as an answer of your question and accept it. — Thanh, Nov 20 '12 at 10:35

score 0 · Answer 1 · answered Nov 20 '12 at 14:22

0

The command to add a primary key in a migration is:

add_column :my_table, :id, :primary_key

answered Nov 20 '12 at 14:22

Elmor

1 Answers1