# \[help\] problem uploading file... w stringifykey! **URL:** \ **Category:** Rails\ **Created:** [August 21, 2007, 12:01pm UTC](https://www.ruby-forum.com/t/help-problem-uploading-file-w-stringifykey/112611 "2007-08-21T12:01:57Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [August 21, 2007, 12:01pm UTC](https://www.ruby-forum.com/t/help-problem-uploading-file-w-stringifykey/112611/1 "2007-08-21T12:01:57Z")
I am uploading an image the standard way… advertising edit view .... .. my controller try to create the image… advertising\_controller def update … @illustration = Illustration.new(params[:file\_data]) … @illustration.save … end from the Illustration model… … attr\_accessor :file\_data … def file\_data=(file\_data) @file\_name = sanitize\_filename(@file\_data.original\_filename) # windows trick write\_attribute ‘extension’, @file\_name.split(’.’).last.downcase end … the request parameters : “\_method”=\>“put”, “id”=\>“5”, “file\_data”=\>#\… but I always get an error : NoMethodError (undefined method `stringify_keys!' for #): /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.2/lib/active_record/base.rb:1669:in`attributes=’ the problem is actually in passing the params[:file\_data], as using @illustration = Illustration.new is OK… 1- what’s this ActiveRecord error `stringify\_keys!’ 2- what’s wrong with my param ? cannot even get into the file\_data method ? thanks a lot for your help… I am stuck for 2 days on this problem… ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [August 21, 2007, 12:07pm UTC](https://www.ruby-forum.com/t/help-problem-uploading-file-w-stringifykey/112611/2 "2007-08-21T12:07:38Z")
i think this method def get\_file send\_file(params[:file]) end is missing check it out ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [August 21, 2007, 12:47pm UTC](https://www.ruby-forum.com/t/help-problem-uploading-file-w-stringifykey/112611/3 "2007-08-21T12:47:34Z")
small background: “stringify\_keys!” errors usually are populated because of some bad usage with hashes: basically, a key of the hash is supposed to be ‘stringified’ to\_s of some sort, but it cannot, because there is no way to ‘stringify’ that key. look at [http://api.rubyonrails.org/classes/ActiveSupport/CoreExtensions/Hash/Keys.html#M000365](http://api.rubyonrails.org/classes/ActiveSupport/CoreExtensions/Hash/Keys.html#M000365) say, as an example, if it u had a hash like {:controller =\> ‘some’, :action =\>‘thing’} it would become {“controller” =\> ‘some’, “action” =\>‘thing’} after using the stringify\_keys! method. but, if you have a hash that has keys that cannot be ‘stringified’, you’ll get this error. in our case, my guess would be #\ is causing an error. maybe it is trying to create a hash out of that object, (while changing it to a params[:file\_data] ) but fails as it is a picture / no method to stringify the key of this object exists … any special reason u don’t use some rails plugin for uploading pics? just googling for a sec, i found [http://www.flex888.com/2007/03/21/three-ruby-on-rails-file-upload-plugins-reviewed.html](http://www.flex888.com/2007/03/21/three-ruby-on-rails-file-upload-plugins-reviewed.html) and i’ve heard good things about acts\_as\_attachment (although i haven’t personally used it). anyway, hope this helps out. shai ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [August 21, 2007, 2:31pm UTC](https://www.ruby-forum.com/t/help-problem-uploading-file-w-stringifykey/112611/4 "2007-08-21T14:31:58Z")
Shai R. wrote: > small background: > > “stringify\_keys!” errors usually are populated because of some bad usage > with hashes: > > basically, a key of the hash is supposed to be ‘stringified’ to\_s of > some sort, but it cannot, because there is no way to ‘stringify’ that > key. > look at > > [http://api.rubyonrails.org/classes/ActiveSupport/CoreExtensions/Hash/Keys.html#M000365](http://api.rubyonrails.org/classes/ActiveSupport/CoreExtensions/Hash/Keys.html#M000365) > > say, as an example, if it u had a hash like > {:controller =\> ‘some’, :action =\>‘thing’} > it would become > {“controller” =\> ‘some’, “action” =\>‘thing’} > after using the stringify\_keys! method. > > but, if you have a hash that has keys that cannot be ‘stringified’, > you’ll get this error. in our case, my guess would be > > #\ > > is causing an error. maybe it is trying to create a hash out of that > object, (while changing it to a params[:file\_data] ) but fails as it is > a picture / no method to stringify the key of this object exists … > > any special reason u don’t use some rails plugin for uploading pics? > just googling for a sec, i found > > [http://www.flex888.com/2007/03/21/three-ruby-on-rails-file-upload-plugins-reviewed.html](http://www.flex888.com/2007/03/21/three-ruby-on-rails-file-upload-plugins-reviewed.html) > > and i’ve heard good things about acts\_as\_attachment (although i haven’t > personally used it). > > anyway, hope this helps out. > > shai thanks a lot for doc links… I already gave a look at the plugins… but actually I don’t need all their features, so I am using the standard Rails’ cookbook indications… writing in my controller @illustration = Illustration.new @illustration.uploaded\_file = params[:illustration][:file\_data] and attr\_accessor :file\_data def uploaded\_file=(incoming\_file) self.file\_name = incoming\_file.original\_filename self.file\_data = incoming\_file write\_attribute ‘extension’, self.file\_name.split(‘.’).last.downcase end makes things running well… need (later) to understand why … kad