Question

我有一个Upload模型用于fileuploads，它与其他具有多态关联的模型共享。

# upload.rb
class Upload < ApplicationRecord
  include ImageUploader[:image]
  include VideoUploader[:video]
  include BackgroundUploader[:background]

  belongs_to :uploadable, polymorphic: true
end

# product.rb
class Product < ApplicationRecord
  has_many :uploads, as: :uploadable, dependent: :destroy
end

# announcement.rb
class Announcement < ApplicationRecord
  has_many :uploads, as: :uploadable, dependent: :destroy
end

# site.rb
class Site < ApplicationRecord
  has_many :uploads, as: :uploadable, dependent: :destroy
end

...

Upload与不同的Shrine上传者联系，例如ImageUploader，BackgroundUploader或VideoUploader，以便上传和处理不同的文件类型。为此，上传针对每种文件类型都有不同的列，例如image_data，video_data或background_data。

现在，Upload的关联“父母”应该只支持某些文件类型。与......相关联时。

Product，它应该只允许图片和视频上传
Announcement，它应该只允许图片上传
Site，它应该只允许后台上传

如何根据与其父记录的关联验证Upload模型？此验证是否应在upload.rb或其父模型中进行？

就代码而言，Upload应仅在与父级相关联时允许相应的字段。有点像...

if upload.parent == product
  validate presence image_data xor video_data

if upload.parent == announcement
  validate presence of image_data

if upload.parent == site
  validate presence of background_data

谢谢！

（Rails）根据父记录验证多态关联？

0 个答案: