add_indexの追加

フォロー機能を追加したいため

add_indexを追加する

rails g migration AddIndexToRelationships

class AddIndexToRelationships < ActiveRecord::Migration[5.1]
def change

end

class AddIndexToRelationships < ActiveRecord::Migration[5.1]
def change
add_index :relationships, :follower_id
add_index :relationships, :followed_id
add_index :relationships, [:follower_id, :followed_id], unique: true　追加
end

rake db:migrate