title: Rails partial update ActionController::UnknownFormat
body: <p>I'm trying to update a partial. Everything worked perfectşy in Rails 3 but now bumped to Rails 4.1 and I'm getting the ActionController::UnknownFormat error.  I'm placing _form.html.haml into bootstrap 3 modal.</p>
  
  <p>aprs_controller.rb (** is the place code gets into and I get the error)</p>
  
  <pre><code>class AprsController &lt; ApplicationController
    include Transloadit::Rails::ParamsDecoder
    include AprsHelper
  
    respond_to :html, :json, :js
  
    def update 
      app = App.where('events._id' =&gt;  BSON::ObjectId.from_string(params[:eventid])).first
      unless  app.check_user_failed == true
        event = app.events.detect { |pr| pr.id.to_s == params[:eventid] }
        apr = event.aprs.detect { |pr| pr.id.to_s == params[:id] } 
        isvalid = check_video_validity(params[:transloadit], event)
        if isvalid == true
          videos = transloadit_file_uploads(params[:transloadit], apr.upload)
          @aprs=nil
          if videos.present?
            apr.upload = nil
            apr.upload = videos 
          else
            flash.now[:error] = "The time of video is wrong"
            return
          end    
          if apr.save  
            event = app.events.detect { |pr| pr.id.to_s == params[:eventid] }
            blank = event.aprs.map{|evt| evt.upload; evt.upload.blank?}
            unless blank.include? true
              event.status = 4
              event.save
            end
            **respond_to do |format| 
              @aprs = event.aprs 
              format.js     
            end**
          end
        else
          flash.now[:error] = "vieo is not valid"
          respond_to do |format| 
            @aprs = nil
            format.js     
          end
        end
      else
        flash.now[:error] = "user failed"   
      end 
    end
  
    private 
    def apr_params
      params.required(:apr).permit(:upload)
    end 
  end
  </code></pre>
  
  <p>update.js.erb</p>
  
  <pre><code>$('#update_container').html("&lt;%= j render 'form',  :locals =&gt; {:aprs =&gt; @aprs} %&gt;");
  </code></pre>
  
  <p>routes</p>
  
  <pre><code>  resources :aprs 
  </code></pre>
  
  <p>_form.html.haml</p>
  
  <pre><code>#update_container
      - if @aprs.present?
          - @aprs.each_with_index do |apr,index|   
              = bootstrap_form_for apr, :remote=&gt; true,   html: {"data-remote" =&gt; 'true', 'data-method' =&gt; 'post', :id =&gt; "showapr#{apr.id}" , "data-type" =&gt; :json,    class: 'form-horizontal' } do |f|
                  = hidden_field_tag :eventid, apr.event.id
                  = transloadit :video_encode
                  .fileupload.fileupload-new.pull-left{"data-provides" =&gt; "fileupload", style: "padding-right: 5px;"}  
                      .fileupload-preview.thumbnail{:style =&gt; "width: 140px; height: 140px;"}
                          - if apr.upload.present?
                              - if apr.upload["thumbs"].present?
                                  %img{ :src =&gt; apr.upload["thumbs"][0], :style =&gt; "width: 140px;height: 140px;"}
                          -else
                              %img{"data-src" =&gt; "holder.js/140x140/text:Lorem ipsum/social", :src =&gt; "", :style =&gt; "width: 140px;height: 140px;"}/
                      - if apr.event.app.check_user_failed == false &amp;&amp;  (apr.event.start_time.day == Time.zone.now.day)
                          %div
                              %span.btn.btn-default.btn-file
                                  %span.fileupload-new Select image
                                  =f.file_field "upload#{apr.id}" , accept: 'video/flv,video/avi,video/mov,video/mp4,video/mpg,video/wmv,video/3gp,video/asf,video/rm,video/swf',  :data =&gt; {:max_file_size =&gt; 30.megabytes}
                          = transloadit_jquerify "showapr#{apr.id}", :wait =&gt; true, :modal=&gt;true,  :triggerUploadOnFileSelection=&gt; true 
      -else
          = label_tag :error_label, "time doesn't fit to update time", class: 'control-label' 
  </code></pre>
  
  <p>Produces this error:</p>
  
  <pre><code> ActionController::UnknownFormat - ActionController::UnknownFormat:
        actionpack (4.1.6) lib/action_controller/metal/mime_responds.rb:440:in `retrieve_collector_from_mimes'
        actionpack (4.1.6) lib/action_controller/metal/mime_responds.rb:256:in `respond_to'
        app/controllers/aprs_controller.rb:40:in `update'
        actionpack (4.1.6) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
        actionpack (4.1.6) lib/abstract_controller/base.rb:189:in `process_action'
        actionpack (4.1.6) lib/action_controller/metal/rendering.rb:10:in `process_action'
        actionpack (4.1.6) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
        activesupport (4.1.6) lib/active_support/callbacks.rb:113:in `call'
        activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
        activesupport (4.1.6) lib/active_support/callbacks.
  </code></pre>
  
  <p>I registered all mime types too(even they are registered)</p>
  
  <pre><code>Mime::Type.register "text/html", :html, %w( application/xhtml+xml ), %w( xhtml )
  Mime::Type.register "text/plain", :text, [], %w(txt)
  Mime::Type.register "text/javascript", :js,
    %w(application/javascript application/x-javascript)
  Mime::Type.register "text/css", :css
  Mime::Type.register "text/calendar", :ics
  Mime::Type.register "text/csv", :csv
  
  Mime::Type.register "image/png", :png, [], %w(png)
  Mime::Type.register "image/jpeg", :jpeg, [], %w(jpg jpeg jpe pjpeg)
  Mime::Type.register "image/gif", :gif, [], %w(gif)
  Mime::Type.register "image/bmp", :bmp, [], %w(bmp)
  Mime::Type.register "image/tiff", :tiff, [], %w(tif tiff)
  
  Mime::Type.register "video/mpeg", :mpeg, [], %w(mpg mpeg mpe)
  
  Mime::Type.register "application/xml", :xml, %w(text/xml application/x-xml)
  Mime::Type.register "application/rss+xml", :rss
  Mime::Type.register "application/atom+xml", :atom
  Mime::Type.register "application/x-yaml", :yaml, %w( text/yaml )
  
  Mime::Type.register "multipart/form-data", :multipart_form
  Mime::Type.register "application/x-www-form-urlencoded", :url_encoded_form
  
  Mime::Type.register "application/json", :json,
    %w(text/x-json application/jsonrequest)
  
  Mime::Type.register "application/pdf", :pdf, [], %w(pdf)
  Mime::Type.register "application/zip", :zip, [], %w(zip)
  </code></pre>
  
  <p>Everything used to work in rails 3 didn't change the code.</p>
  
  <p>Server log after the update action</p>
  
  <pre><code>Completed 200 OK in 320ms (Views: 308.7ms)
  
  
  Started PATCH "/aprs/5429cf4663616e0f6d100000" for 127.0.0.1 at 2014-09-30 00:30:18 +0300
  Processing by AprsController#update as HTML
    Parameters: {"transloadit"=&gt;"{\"ok\":\"ASSEMBLY_COMPLETED\",\"message\":\"The assembly was successfully completed.\",\"assembly_id\":\"c0bbb2b0481f11e4bb7fe3cde209aa37\",\"parent_id\":null,\"assembly_url\":\"http://api2.ebeny.transloadit.com/assemblies/c0bbb2b0481f11e4bb7fe3cde209aa37\",\"assembly_ssl_url\":\"https://ebeny.transloadit.com/assemblies/c0bbb2b0481f11e4bb7fe3cde209aa37\",\"bytes_received\":258018,\"bytes_expected\":258018,\"client_agent\":\"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/36.0.1985.125 Chrome/36.0.1985.125 Safari/537.36\",\"client_ip\":\"85.100.75.234\",\"client_referer\":\"http://0.0.0.0:3000/apps/5429cf4563616e0f6d010000\",\"start_date\":\"2014/09/29 21:29:54 GMT\",\"is_infinite\":false,\"has_dupe_jobs\":false,\"upload_duration\":4.538,\"execution_start\":\"2014/09/29 21:29:59 GMT\",\"execution_duration\":18.362,\"notify_start\":null,\"notify_url\":null,\"notify_status\":null,\"last_job_completed\":\"2014/09/29 21:30:17 GMT\",\"notify_duration\":null,\"fields\":{},\"running_jobs\":[],\"bytes_usage\":1374741,\"executing_jobs\":[],\"started_jobs\":[],\"files_to_store_on_s3\":0,\"queued_files_to_store_on_s3\":0,\"parent_assembly_status\":null,\"params\":\"{\\\"template_id\\\":\\\"8f64b330a16f11e394d06b3e241b8964\\\"}\",\"uploads\":[{\"id\":\"c3485100481f11e494cc9bab5ef2bbe3\",\"name\":\"IMG_1561.MOV\",\"basename\":\"IMG_1561\",\"ext\":\"mov\",\"size\":257409,\"mime\":\"video/quicktime\",\"type\":\...........
  flags=[]
                           COMMAND      database=approachmachine_development command={:getlasterror=&gt;1, :w=&gt;1} runtime: 2.2516ms
  Completed 406 Not Acceptable in 80ms
  
  ActionController::UnknownFormat - ActionController::UnknownFormat:
    actionpack (4.1.6) lib/action_controller/metal/mime_responds.rb:440:in `retrieve_collector_from_mimes'
    actionpack (4.1.6) lib/action_controller/metal/mime_responds.rb:256:in `respond_to'
    app/controllers/aprs_controller.rb:30:in `update'
    actionpack (4.1.6) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
    actionpack (4.1.6) lib/abstract_controller/base.rb:189:in `process_action'
    actionpack (4.1.6) lib/action_controller/metal/rendering.rb:10:in `process_action'
    actionpack (4.1.6) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
    activesupport (4.1.6) lib/active_support/callbacks.rb:113:in `call'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:282:in `block (2 levels) in halting_and_conditional'
    activesupport (4.1.6) lib/active_support/core_ext/time/zones.rb:47:in `use_zone'
    app/controllers/application_controller.rb:23:in `set_user_time_zone'
    activesupport (4.1.6) lib/active_support/callbacks.rb:424:in `block in make_lambda'
    activesupport (4.1.6) lib/active_support/callbacks.rb:281:in `block in halting_and_conditional'
    activesupport (4.1.6) lib/active_support/callbacks.rb:299:in `block (2 levels) in halting'
    i18n (0.6.11) lib/i18n.rb:256:in `with_locale'
    app/controllers/application_controller.rb:19:in `set_locale'
    activesupport (4.1.6) lib/active_support/callbacks.rb:424:in `block in make_lambda'
    activesupport (4.1.6) lib/active_support/callbacks.rb:298:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:149:in `block in halting_and_conditional'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:229:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:229:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
    activesupport (4.1.6) lib/active_support/callbacks.rb:86:in `run_callbacks'
    actionpack (4.1.6) lib/abstract_controller/callbacks.rb:19:in `process_action'
    actionpack (4.1.6) lib/action_controller/metal/rescue.rb:29:in `process_action'
    actionpack (4.1.6) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
    activesupport (4.1.6) lib/active_support/notifications.rb:159:in `block in instrument'
    activesupport (4.1.6) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
    activesupport (4.1.6) lib/active_support/notifications.rb:159:in `instrument'
    actionpack (4.1.6) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
    actionpack (4.1.6) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
    actionpack (4.1.6) lib/abstract_controller/base.rb:136:in `process'
    actionview (4.1.6) lib/action_view/rendering.rb:30:in `process'
    actionpack (4.1.6) lib/action_controller/metal.rb:196:in `dispatch'
    actionpack (4.1.6) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
    actionpack (4.1.6) lib/action_controller/metal.rb:232:in `block in action'
    actionpack (4.1.6) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
    actionpack (4.1.6) lib/action_dispatch/routing/route_set.rb:50:in `call'
    actionpack (4.1.6) lib/action_dispatch/journey/router.rb:73:in `block in call'
    actionpack (4.1.6) lib/action_dispatch/journey/router.rb:59:in `call'
    actionpack (4.1.6) lib/action_dispatch/routing/route_set.rb:678:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!'
    omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    meta_request (0.3.4) lib/meta_request/middlewares/app_request_handler.rb:13:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    meta_request (0.3.4) lib/meta_request/middlewares/meta_request_handler.rb:13:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    bullet (4.13.2) lib/bullet/rack.rb:12:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    i18n-js (2.1.2) lib/i18n-js/middleware.rb:11:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack-mobile-detect (0.4.0) lib/rack/mobile-detect.rb:164:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    http_accept_language (2.0.2) lib/http_accept_language/middleware.rb:13:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/rack/error_collector.rb:50:in `traced_call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:55:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/rack/agent_hooks.rb:26:in `traced_call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:55:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/rack/browser_monitoring.rb:23:in `traced_call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:55:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/rack/developer_mode.rb:48:in `traced_call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:55:in `call'
    warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
    warden (1.2.3) lib/warden/manager.rb:34:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
     () home/caner/.rvm/gems/ruby-2.1.2/bundler/gems/client_side_validations-e431ba00e2d7/lib/client_side_validations/middleware.rb:17:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/etag.rb:23:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/head.rb:11:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/flash.rb:254:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
    rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/cookies.rb:560:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
    activesupport (4.1.6) lib/active_support/callbacks.rb:82:in `run_callbacks'
    actionpack (4.1.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/reloader.rb:73:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    better_errors (2.0.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
    better_errors (2.0.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
    better_errors (2.0.0) lib/better_errors/middleware.rb:57:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack-contrib (1.1.0) lib/rack/contrib/response_headers.rb:17:in `call'
    meta_request (0.3.4) lib/meta_request/middlewares/headers.rb:16:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    railties (4.1.6) lib/rails/rack/logger.rb:38:in `call_app'
    railties (4.1.6) lib/rails/rack/logger.rb:20:in `block in call'
    activesupport (4.1.6) lib/active_support/tagged_logging.rb:68:in `block in tagged'
    activesupport (4.1.6) lib/active_support/tagged_logging.rb:26:in `tagged'
    activesupport (4.1.6) lib/active_support/tagged_logging.rb:68:in `tagged'
    railties (4.1.6) lib/rails/rack/logger.rb:20:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/request_id.rb:21:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/runtime.rb:17:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    activesupport (4.1.6) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/lock.rb:17:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    actionpack (4.1.6) lib/action_dispatch/middleware/static.rb:64:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    railties (4.1.6) lib/rails/engine.rb:514:in `call'
    railties (4.1.6) lib/rails/application.rb:144:in `call'
    railties (4.1.6) lib/rails/railtie.rb:194:in `method_missing'
    newrelic_rpm (3.9.4.245) lib/new_relic/agent/instrumentation/middleware_tracing.rb:57:in `call'
    rack (1.5.2) lib/rack/content_length.rb:14:in `call'
    thin (1.6.2) lib/thin/connection.rb:86:in `block in pre_process'
    thin (1.6.2) lib/thin/connection.rb:84:in `pre_process'
    thin (1.6.2) lib/thin/connection.rb:53:in `process'
    thin (1.6.2) lib/thin/connection.rb:39:in `receive_data'
    eventmachine (1.0.3) lib/eventmachine.rb:187:in `run'
    thin (1.6.2) lib/thin/backends/base.rb:73:in `start'
    thin (1.6.2) lib/thin/server.rb:162:in `start'
    rack (1.5.2) lib/rack/handler/thin.rb:16:in `run'
    rack (1.5.2) lib/rack/server.rb:264:in `start'
    railties (4.1.6) lib/rails/commands/server.rb:69:in `start'
    railties (4.1.6) lib/rails/commands/commands_tasks.rb:81:in `block in server'
    railties (4.1.6) lib/rails/commands/commands_tasks.rb:76:in `server'
    railties (4.1.6) lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    railties (4.1.6) lib/rails/commands.rb:17:in `&lt;top (required)&gt;'
    bin/rails:4:in `&lt;main&gt;'
  </code></pre>