undefined method `stringify_keys'

Question

When I try to upload image using Paperclip gem I got this error:

NoMethodError (undefined method `stringify_keys' for <ActionDispatch::Http::UploadedFile:0x000000025387f0>)

class MenuItem < ActiveRecord::Base
 has_one :image


end

class Image < ActiveRecord::Base
 belongs_to :menu_item
 has_attached_file :image, :styles => {
            :large => "640x480",
            :medium => "300x300", 
            :thumb => "100x100" 
           }
end

possible duplicate of [undefined method \`stringify\_keys!' ruby on rails](http://stackoverflow.com/questions/1815697/undefined-method-stringify-keys-ruby-on-rails) — givanse, Dec 11 '13 at 17:14

score 74 · Answer 1 · answered Dec 15 '11 at 04:42

74

I've seen this error happen before, usually when people attempt to call update_attributes like this:

update_attributes(params[:image])

The call should actually be this:

update_attributes(:image => params[:image])

A bit of a shot in the dark, but if that's it I'm sure we'll all be impressed.

answered Dec 15 '11 at 04:42

Ryan Bigg

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1

This did the trick for me as well, except I was using build() instead of update_attributes(). Thanks :) – fholgado Feb 22 '12 at 21:11
@RyanBigg can you elaborate on the problem?I am having a similar issue with uploading a zip file which I create through Submission.uploaded_file = params[:submission]. Stringify Keys only happens when I have the CanCan gem turned on though. – BookOfGreg Aug 27 '12 at 18:37
1

Could the OP mark this as the correct answer? This fixed my issue as well. – battlemidget Feb 01 '13 at 18:22
@Hamdan: OMG YES!!!1one. Paperclip expects all the attributes for the image to be sent through as an 'image' attribute. What the OP was originally doing was not that. – Ryan Bigg Apr 27 '14 at 22:36
Thats not what im asking. I actually cant understand how (:image => params[:image]) is different from (params[:image]) since what is inside params[:image] is actually the image object that the :image use to inherit its status of 'image object'. Can anybody tell me? – Hamdan Apr 29 '14 at 12:18

score 1 · Answer 2 · edited Jun 20 '20 at 09:12

1

After struggling for a while in rails 3.2.2 I managed to solve this in this manner

(image = Image.new(image: params[:image])).save

update_attributes(image: image)

edited Jun 20 '20 at 09:12

Community

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answered Jun 13 '12 at 13:23

Sagish

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score 0 · Answer 3 · answered Jun 18 '13 at 10:43

I just had this problem, and to clarify things a bit, update_attributes is different from update_attribute.

The following should work:

update_attributes(:image => params[:image])

or

update_attribute(:image, params[:image])

There you go! There are other issues with update_attributes related to attr_accesible, but either works.

undefined method `stringify_keys'

3 Answers3

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