JSON response , error message

[Akvarel]

Hello

I am trying to show the errors that can occur by uploading a file (file

name, size).

I need have your error messages associated to the 'error' key in my json response

else

   format.html { render action: "new" }

   format.json { render json: @upload.errors, status:

:unprocessable_entity }

end

my validations:

validates_uniqueness_of :upload_file_name, :message => "File with

this name is already in the database"

validates :upload_file_size,  :inclusion  => {:in

=>10.megabytes..20.megabytes}, :message =>"Too big or too small"

      def to_jq_upload

        {

          "name" => read_attribute(:upload_file_name),

          "size" => read_attribute(:upload_file_size),

          "url" => upload.url(:original),

          "delete_url" => upload_path(self),

          "delete_type" => "DELETE"

        }

      end

    end

I have tried:
format.json { render json: => [{:error=> @upload.errors.full_messages }] } 

using this shows the validation message but I need the status: to be there as well

render json: {error: @upload.errors.full_messages}, status: :unprocessable_entity 

shows no error messages at all

render json: {error: @upload.errors.full_messages}, status: :unprocessable_entity 
 I get an error-text : Internal Server Error and not what stands in my validation messages

Thanks in advanced

[Saravanan P]

in your controller:

render :json => { :errors => @example.errors.full_messages }, :status => 422

in your js file:

    $('.form_id_or_class').live('submit', function() {

      $.ajax({

        url: $(this).attr("action"),

          type: "POST",

          data: $(this).serialize(),

          success: function(data) {

           // do some action

        }

        ,error: function(xhr){

          var errors = $.parseJSON(xhr.responseText).errors

        }

      });

      return false;

    });

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Regards by

Saravanan.P

[Jordon Bedwell]

On Sun, Oct 28, 2012 at 12:26 AM, Saravanan P
<sarav...@shriramits.com> wrote:
> render :json => { :errors => @example.errors.full_messages }, :status => 422

Why are you sending a 422? If you really want to stick in the 400
range it would be more suitable to send a 409 conflict since it
literally is a conflict but some just prefer to stick to a generic
500.

[Katja Kokatjuhha]

in your js file:

    $('.form_id_or_class').live('submit', function() {

      $.ajax({

        url: $(this).attr("action"),

          type: "POST",

          data: $(this).serialize(),

          success: function(data) {

           // do some action

        }

        ,error: function(xhr){

          var errors = $.parseJSON(xhr.responseText).errors

        }

      });

      return false;

    });

The only js script i have there is the following and it is in the index.html.erb. I am using this example for File uploader in Ruby on Rails.
Should I just add your code to mine or mine code has to be modified?


<script type="text/javascript" charset="utf-8">
  $(function () {
      // Initialize the jQuery File Upload widget:
      $('#fileupload').fileupload();
      //
      // Load existing files:
      $.getJSON($('#fileupload').prop('action'), function (files) {
        var fu = $('#fileupload').data('fileupload'),
          template;
        fu._adjustMaxNumberOfFiles(-files.length);
        console.log(files);
        template = fu._renderDownload(files)
          .appendTo($('#fileupload .files'));
        // Force reflow:
        fu._reflow = fu._transition && template.length &&
          template[0].offsetWidth;
        template.addClass('in');
        $('#loading').remove();
      });

  });
</script>

[Matt Jones]

422 is the recommended behavior from respond_with and friends:

https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/metal/responder.rb#L259

409 seems odd, given that the error could be "file too large" which isn't really "a conflict with the current state of the resource" as described in the RFC.

Also note that returning a 422 causes ActiveResource to behave in an expected manner (failing a save rather than raising an exception), which may-or-may-not be relevant for this use case.

--Matt Jones