ActiveModel :: MissingAttributeError:无法使用FactoryGirl写入未知属性"ad_id" [英] ActiveModel::MissingAttributeError: can't write unknown attribute `ad_id' with FactoryGirl

问题描述

我有以下型号:

class Ad < ActiveRecord::Base
  belongs_to :page

  has_one :image
  has_one :logo
end

class Page < ActiveRecord::Base
  has_many :logos
  has_many :images
  has_many :ads
end

class Image < ActiveRecord::Base
  belongs_to :page
  has_many :ads
end

我已经定义了以下工厂:

And I have defined the following Factories:

factory :page do
  url 'test.com'
end

factory :image do
  width 200
  height 200
  page
end

factory :ad do
  background 'rgb(255,0,0)'
  page
  image
end

当我尝试这样做时:

ad = FactoryGirl.create(:ad)我收到以下错误 ActiveModel :: MissingAttributeError:无法在我确定广告中图像关联的行中写入未知属性ad_id'工厂.

ad = FactoryGirl.create(:ad) I get the following error ActiveModel::MissingAttributeError: can't write unknown attribute ad_id' right in the line where I decide the image association in the ad Factory.

我在这里做什么错了?

推荐答案

当您说:

has_one :image

Rails希望您在 images 表中定义一个 ad_id 字段.考虑到您的关联的组织方式，我假设您有一个 image_id 和一个 logo_id 和一个 ads 表，所以不是:

Rails expects you to define an ad_id field at the images table. Given the way your associations are organised, I assume you have an image_id and a logo_id a the ads table so instead of:

class Ad < ActiveRecord::Base
  belongs_to :page

  has_one :image
  has_one :logo
end

您可能是说:

class Ad < ActiveRecord::Base
  belongs_to :page
  belongs_to :image
  belongs_to :logo
end

如果不是这种情况，则需要在 Image 和 Logo 中都添加 ad_id 列.

If that's not the case then you need to add ad_id columns to both Image and Logo.

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