discourse/db/migrate/20130416004933_group_users.rb

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class GroupUsers < ActiveRecord::Migration
def change
create_table :group_users, force: true do |t|
t.integer :group_id, null: false
t.integer :user_id, null: false
t.timestamps
end
add_index :group_users, [:group_id, :user_id], unique: true
end
end