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Editorial Team
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Asked: 2026-05-26T15:50:56+00:00

For some reason, one of my params (file upload) always is nil. Here is

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For some reason, one of my params (file upload) always is nil. Here is the params hash in the exception page that is shown:

{"utf8"=>"✓",
 "_method"=>"put",
 ...

 "avatar"=>#<ActionDispatch::Http::UploadedFile:0x007fe7fa1dd460 @original_filename="rp.jpg",
 @content_type="image/jpeg",
 @headers="Content-Disposition: form-data; name=\"user[avatar]\"; filename=\"rp.jpg\"\r\nContent-Type: image/jpeg\r\n",
 @tempfile=#<File:/var/folders/44/xrz6nqg91_l_gzmhxt8s771c0000gn/T/RackMultipart20111107-12870-nguhuw>>},
 "commit"=>"Update",
 "id"=>"1"}

In my controller, I have if params["avatar"], but avatar is always returning nil.

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1 Answer

  1. Editorial Team

    avatar is likely nested within another element. By omitting important details, we can’t tell, but I can tell that your dump has an unbalanced } on the line starting with @tempfile, so it’s likely that the matching { appears before "avatar"=> and thus it is nested within another hash.

    You might try something like params[:user][:avatar], or whatever the actual name of your model is.

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