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I have = f.file_field "file", required: true, class: "filestyle" in my html.slim in Rails. How do I make sure that only text files with extension .txt can be uploaded, but not other files with other extensions like .png or .jpg

gogofan
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2 Answers2

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Use :accept parameter of file_field:

:accept - If set to one or multiple mime-types, the user will be suggested a filter when choosing a file. You still need to set up model validations.

Mime type for text files is text/plain. So your field would look like this:

= f.file_field "file", required: true, class: "filestyle", accept: "text/plain"
Sergio Tulentsev
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  • What if I am not using a modal for that, is it still doable? – gogofan Aug 08 '17 at 11:50
  • @JeffreyYong: I don't see the word "modal" mentioned anywhere in this post or linked docs. So I'm not sure what you meant by that. – Sergio Tulentsev Aug 08 '17 at 17:18
  • Your solution actually already works for me. The file chooser prevents the user from choosing file type other than text file. Thanks! – gogofan Aug 08 '17 at 20:02
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Try using Paperclip or carrierwave gem.This should make your life easier :)

Jishnu Janardhanan
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