How can I restrict Paperclip to only accept images?

问题

How can I restrict Paperclip to only accept images? I'm using Amazon S3 for storage if that's relevant. Thanks for reading.

回答1:

Paperclip has validation methods like validates_attachment_presence, validates_attachment_content_type, and validates_attachment_size.

So all you need to do is pass mime types of images you'd like to have as attachments:

validates_attachment_content_type 'image/png', 'image/jpg'

回答2:

From https://makandracards.com/makandra/606-only-allow-pictures-as-paperclip-attachments

validates_attachment_content_type :image, :content_type => /^image\/(jpg|jpeg|pjpeg|png|x-png|gif)$/, :message => 'file type is not allowed (only jpeg/png/gif images)'

来源：https://stackoverflow.com/questions/4676902/how-can-i-restrict-paperclip-to-only-accept-images