Question

以下方法适当地传递测试：

def associate_grid_location
        devices.each do |device|
            if device.grid_location and grid_location_id.nil?
                update_attribute(:grid_location_name,device.grid_location.grid_name)
                update_attribute(:grid_location_id,device.grid_location_id)
                break
            end
        end
    end

但是，如果我在调用此方法时运行相同的测试逻辑，则无法更新每个机柜的grid_location_name和grid_location_id：

def self.associate_grid_locations
        Cabinet.all.each do |cabinet|
            cabinet.associate_grid_location
        end
    end

请说明为什么会失败。

通过考试：

test "Cabinet associate grid location from device where device has grid location" do
    @cabinet = cabinets(:one)
    @cabinet.grid_location_id = nil
    @device = devices(:one)
    @grid_location = grid_locations(:one)
    @grid_location.grid_name = "test location"
    @device.grid_location = @grid_location
    @cabinet.devices << @device
    @cabinet.associate_grid_location

    assert_equal @grid_location.grid_name, @cabinet.grid_location_name, "Failed: Did not update cabinet grid location"
    assert_equal @device.grid_location.id, @cabinet.grid_location_id, "Failed: Did not update cabinet grid location"
  end

测试失败：

test "Cabinet associate grid location from device where device has grid location (Called on Cabinet)" do
    @cabinet = cabinets(:one)
    @cabinet.grid_location_id = nil
    @device = devices(:one)
    @grid_location = grid_locations(:one)
    @grid_location.grid_name = "test location"
    @device.grid_location = @grid_location
    @cabinet.devices << @device
    Cabinet.associate_grid_locations

    assert_equal @grid_location.grid_name, @cabinet.grid_location_name, "Failed: Did not update cabinet grid location"
    assert_equal @device.grid_location.id, @cabinet.grid_location_id, "Failed: Did not update cabinet grid location"
  end

谢谢。

Answer 1

Cabinet.associate_grid_locations调用Cabinet.all，它实例化新对象（除非您启用了身份映射），这些对象未链接到您在测试中实例化的对象。假设没有其他错误，在#reload上调用@cabinet会使测试通过。

请说明以下测试失败的原因

1 个答案: