How can I restrict Paperclip to only accept images?

How can I restrict Paperclip to only accept image开发者_如何学JAVAs? I'm using Amazon S3 for storage if that's relevant. Thanks for reading.

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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)'

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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'