rails 添加删除表 字段

增加表

rails g model water_temperature position:integer name:string en_name:string

删除新增错误的表

rails d model water_temperature position:integer name:string en_name:string

新增表字段

rails g migration add_column_water_temperature_id_into_product

  def up    add_column :products, :water_temperature_id, :integer  end  def down    remove_column :water_temperature_id  end

删除表字段

rails g migration remove_column_water_temperature_id_into_product

  def change    remove_column :skus, :face_price_id  end

修改字段

rails g migration rename_column_seat_powers_id_into_product

  def up    rename_column :products, :seat_powers_id, :seat_power_id  end  def down    rename_column :products, :seat_power_id, :seat_powers_id  end

修改字段属性

rails g migration change_column_seat_powers_into_product

  def up    change_column :products, :seat_powers, :string  end  def down    change_column :products, :seat_powers, :integer  end