[LRUG] AJAX file uploads and content types

[Viktor Tron]

On Wed, 04 Apr 2012 09:29:12 +0100, Andrew Stewart  
<boss at airbladesoftware.com> wrote:

> Morning El Rug,
>
> I have a Rails 3.0.11 app which does AJAX file uploads using the  
> remotipart gem [1].  Everything works perfectly in development.
>
>
> In production I get 406 errors.  I'd like to (a) find and fix the  
> problem, and (b) work around it in the meantime.
>
> The basic process is this:
>
> 1) User submits a 'remote' form with a file input.
> 2) Remotipart's javascript intercepts the form submission, creates an  
> iframe with the form data in it, and posts the iframe's form to the  
> server (with content type text/html).
> 3) A remotipart middleware intervenes in the request to convert the  
> request to text/javascript.
> 4) My controller action saves the image and responds by rendering  
> create.js.erb.
>
> The problem seems to be at step 3.  To gather more information I added  
> `$stderr.puts "useful info"` etc to the remotipart middleware but I  
> can't find the output in my unicorn logs.
>
> The 406 error is thrown at step 4 because my controller action only  
> responds to javascript but the request is arriving as HTML.

then the problem is in step 1.
make sure you have :remote => true option in the form.
you could also try adding :format => :js to your route.
 from rails 3.1 (but not in 3.0) file_field automatically adds :multipart  
=> true to the enclosing form.

hth

> Can anyone shed any light on this?
>
> And in the meantime, can anyone tell me how to render my create.js.erb  
> response even if the request wants html?  I have tried various  
> permutations in my respond_to block without success.
>
> Thank you!
>
> [1] https://github.com/JangoSteve/remotipart
> [2]  
> https://github.com/JangoSteve/remotipart/blob/master/lib/remotipart/middleware.rb
>
> Cheers,
>
> Andy Stewart
> ----
> http://airbladesoftware.com
>
>
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