Question

I want to add a composite primary key into a table. So I added the following raw sql query into my migration file. However, when I run rake db:setup, I did not see a primary key for the table because schema.rb was not affected by this migration. How should I make this work? Thanks.

class AddPrimaryKeyToTable < ActiveRecord::Migration
  def up
    execute "ALTER TABLE table ADD PRIMARY KEY(identifier,time)"
  end

  ...

Answer 1

将sql查询更新到下面。

execute "ALTER TABLE table ADD PRIMARY KEY (identifier,time);"

Adding a composite primary key in migration using raw sql

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