在ActiveAdmin中的两个模型之间共享一个载波上传器

Question

I have one CarrierWave Uploader called documents .

Three Models:

1. University has_many :documents
2. WebinarContent has_many :documents
3. Document
   belongs_to :university
   belongs_to :webinar_content

I currently have ActiveAdmin setup: app/admin/document.rb

belongs_to :university

That works well, however, when I try adding another belongs_to :webinar_content association, I get the following error:

Couldn't find University with 'id'=

Any idea on how to resolve this?

Answer 1

Without seeing your schema, its hard to tell. Though I suspect you want polymorphic associations.

http://guides.rubyonrails.org/association_basics.html#polymorphic-associations#polymorphic-associations

Basically you want your document to belongs_to :documentable having a documentable_id and a documentable_type on the Document model.

Then on your other models you wish to upload documents to you have has_many :documents