ActionController UnknownFormat

Question

In my rails app I have a ajax request to the server  to store some data  This used to work without any problem  but now I get an error   ActionController  UnknownFormat  ActionController  UnknownFormat     app controllers reservations controller rb 45 in  create    As following is the controller and my javascript file where I declare the datatype do be JSON  class ReservationController  lt  ApplicationController    respond to  html   json    def create             respond to do  format        if  reservation save         format html do           redirect to             end         format json   render json   reservation to json         else         render  new        end     end   respond to   end   create  end   ReservationController   function js    ajax           url  url link          dataType   json           type   POST           data  dataToSend            The complete error log is   Completed 406 Not Acceptable in 45ms  ActionController  UnknownFormat  ActionController  UnknownFormat   app controllers bookings controller rb 45 in  create   Rendered  Users tiagovieira  rvm gems ruby-2 0 0-p451 gems actionpack-4 0 0 lib action dispatch middleware templates rescues  source erb  0 5ms  Rendered  Users tiagovieira  rvm gems ruby-2 0 0-p451 gems actionpack-4 0 0 lib action dispatch middleware templates rescues  trace erb  0 8ms  Rendered  Users tiagovieira  rvm gems ruby-2 0 0-p451 gems actionpack-4 0 0 lib action dispatch middleware templates rescues  request and response erb  0 8ms  Rendered  Users tiagovieira  rvm gems ruby-2 0 0-p451 gems actionpack-4 0 0 lib action dispatch middleware templates rescues diagnostics erb within rescues layout  9 6ms

User · Answer

Well I fond this post because I got a similar error. So I added the top line like in your controller respond_to :html, :json

then I got a different error(see below)

The controller-level respond_to' feature has been extracted to theresponders` gem. Add it to your Gemfile to continue using this feature: gem 'responders', '~> 2.0' Consult the Rails upgrade guide for details. But that had nothing to do with it.

User · Answer

Update the create action as below   def create         respond to do  format      if  reservation save       format html do         redirect to           end       format json   render json   reservation to json       else       format html   render  new      Specify the format in which you are rendering  new  page       format json   render json   reservation errors      You might want to specify a json format as well     end   end end   You are using respond to method but anot specifying the format in which a new page is rendered  Hence  the error ActionController  UnknownFormat

User · Answer

This problem happened with me and sovled by just add    respond to  html   json   to ApplicationController file  You can Check Devise issues on Github  https   github com plataformatec devise issues 2667

User · Answer

You can also modify your config routes rb file like    get  ajax  action   to   ajax  action    defaults   gt     format   gt   json      Which will default the format to json  It is working fine for me in Rails 4   Or if you want to go even further and you are using namespaces  you can cut down the duplicates   namespace  api  defaults   format   json   do     your controller routes here     end   with the above everything under  api will be formatted as json by default

User · Answer

There is another scenario where this issue reproduces  as in my case   When THE CLIENT REQUEST doesn t contain the right extension on the url  the controller can t identify the desired result format    For example  the controller is set to respond to  json  as a single option  without a HTML response - while the client call is set to  reservations instead of  reservations json   Bottom line  change the client call to  reservations json

[ruby] ActionController::UnknownFormat

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