class CreateBoardLabels < ActiveRecord::Migration[4.2]
DOWNTIME = false disable_ddl_transaction! def change create_table :board_labels do |t|
t.references :board, foreign_key: { on_delete: :cascade }, null: false t.references :label, foreign_key: { on_delete: :cascade }, null: false
t.index [:board_id, :label_id], unique: true end end end