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I want to only be able to upload .apk files.
However, when I try this with an .apk file it is rejected.
What I have tried so far:
validates_attachment_content_type :app, :content_type => ['apk']
How do you do this? Perhaps there is a way to specify a regex for the file name (and extension) ?
Try
This is the actual mime type for apk files.
If that doesn’t work, then remove the validation temporarily and upload an apk file. See what the content_type is being stored as in the database and then use that as the string. You may need to test with a variety of browsers in case there are differences.
Hope this helps.