Ajax请求不起作用rails 4

Question

I am trying to hit the database at the exit of a field without reloading the form using Ajax. The controller must do some process on the data obtained from the database and respond to the view. The user will then continue with the input.

I am missing something and just can't see what is wrong. I have the same piece of code working in a Rails 3.2 application without a problem. In Rails 3.2 the request goes to the check_matricula method, but in Rails 4, it goes to the show action.

The following code is not working in my Rails 4 app:

Gemfile

gem 'responders', '~> 2.0'

View

<div class="field">
    <%= f.text_field :matricula, { "data-remote" => true, "data-url" => "/liquidaciones_de_viajes/check_matricula", "data-type" => :json, :size => 10 } %>
    <span id="check_matricula">&nbsp;</span>
</div>

Controller

class LiquidacionesDeViajesController < ApplicationController
        respond_to :html, :json

  def check_matricula
    @matricula = Matricula.find_by_codigo(params[:liquidacion_de_viajes][:matricula])

    # ... some process that result in matricula_ok true or false ...

    if matricula_ok
      respond_with(@matricula.empresa.razon_social)
    else
      respond_with(nil)
    end
  end
end

assets/javascripts/check_matricula.js

$(document).ready(function() {
    $("#liquidacion_de_viajes_matricula").bind('ajax:success', function(evt, data, status, xhr) {
        if (data !== null) {
            $('#razon_social').html(data.razon_social);
            $('#check_matricula').html('');
        } else {
            $('#check_matricula').html('Error de matricula');
            $('#razon_social').empty();
        }
    });

    $("#liquidacion_de_viajes_matricula").live('ajax:before', function() {
        if ($(this).val() == '') {
            return false;
        }
    });

    $("#liquidacion_de_viajes_matricula").focus(function() {
        $('#check_matricula').empty();
        $('#razon_social').empty();
    });
});

I see in console a GET is there but I did a POST in the route:

Started GET "/liquidaciones_de_viajes/check_matricula?liquidacion_de_viajes%5Bmatricula%5D=5‌​555" for 127.0.0.1 at 2016-05-30 15:00:50 -0300
Processing by LiquidacionesDeViajesController#show as JSON
Parameters: {"liquidacion_de_viajes"=>{"matricula"=>"5555"}, "id"=>"check_matricula"}

Answer 1

Please change your response in Json

  def check_matricula
      @matricula = Matricula.find_by_codigo(params[:liquidacion_de_viajes][:matricula])

  ... some process that result in matricula_ok true or false ...

       if matricula_ok
        respond_to do |format|
          format.html
          format.json{
            render :json => @matricula.empresa.razon_social.to_json
          }
      end

      else
          respond_with(nil)
      end
  end