Using factory_girl with PaperClip 4.0

factory-bot, paperclip, ruby-on-rails

Solution

The issue appears to be caused by line 61 in media_type_spoof_detector.

Paperclip is trying to find the mime type of the "file" you have uploaded. When there isn't one, it's failing validation to protect you from file type spoofing.

I haven't tried this myself, but perhaps your best bet would be to use a real file, and set it using the `fixture_file_upload` method from `ActionDispatch::TestProcess`.

factory :attachment do
   supporting_documentation { fixture_file_upload 'test.pdf', 'application/pdf' }

   # This is to prevent Errno::EMFILE: Too many open files
   after_create do |attachment, proxy|
     proxy.supporting_documentation.close
   end
end

You will need to include `ActionDispatch::TestProcess` in `test_helper.rb`

This was first posted here.

Problem

Does anyone know the proper way to create PaperClip 4.0 attachments with factory_girl, bypassing any of the PaperClip processing and validation? I used to just be able to do the following in my factory: ``` factory :attachment do supporting_documentation_file_name { 'test.pdf' } supporting_documentation_content_type { 'application/pdf' } supporting_documentation_file_size { 1024 } # ... end ``` This would basically trick PaperClip into thinking that there was a valid attachment. After upgrading from 3.5.3 to 4.0, I now get a validation error: ``` ActiveRecord::RecordInvalid: Validation failed: Image translation missing: en.activerecord.errors.models.attachment.attributes.supporting_documentation.spoofed_media_type ``` NOTE: The original discussion for PaperClip 3.X is here: How Do I Use Factory Girl To Generate A Paperclip Attachment?

Original source

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