ActionView::MissingTemplateにはまる

JQueryの$.ajaxからangularjsの$httpに変更すると、railsのアクションの呼び出しで失敗するケースにはまったのでメモ。

railsのエラー内容(xxxxとかyyyyはアプリ固有の値)

ActionView::MissingTemplate (Missing template sample/index, application/index with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}. Searched in:
  * "/home/xxxx/yyyy/app/views"
):
  actionpack (4.0.1) lib/action_view/path_set.rb:46:in `find'
  actionpack (4.0.1) lib/action_view/lookup_context.rb:115:in `find'
  actionpack (4.0.1) lib/action_view/renderer/abstract_renderer.rb:18:in `find_template'
  actionpack (4.0.1) lib/action_view/renderer/template_renderer.rb:35:in `determine_template'
  actionpack (4.0.1) lib/action_view/renderer/template_renderer.rb:8:in `render'
  actionpack (4.0.1) lib/action_view/renderer/renderer.rb:42:in `render_template'
  actionpack (4.0.1) lib/action_view/renderer/renderer.rb:23:in `render'
  actionpack (4.0.1) lib/abstract_controller/rendering.rb:127:in `_render_template'
  actionpack (4.0.1) lib/action_controller/metal/streaming.rb:219:in `_render_template'
  actionpack (4.0.1) lib/abstract_controller/rendering.rb:120:in `render_to_body'
  actionpack (4.0.1) lib/action_controller/metal/rendering.rb:33:in `render_to_body'
  actionpack (4.0.1) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
  actionpack (4.0.1) lib/abstract_controller/rendering.rb:97:in `render'
  actionpack (4.0.1) lib/action_controller/metal/rendering.rb:16:in `render'
  actionpack (4.0.1) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
  activesupport (4.0.1) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
  /home/xxxx/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'

テンプレートがないということらしい。

JQueryの$.ajaxのコード

function xhr_get(url) {
  return $.ajax({
    url: url,
    type: 'get',
    dataType: 'json'
  })
         .always(function(){
           console.log("success");
         })
         .fail(function(){
           console.log("error");
         });
}

angularjsの$httpのコード

app.factory('SampleService', function($http) {
  var search = function(params) {
    return $http({
      method: 'GET',
      url:'/sample/index',
      params: params,
      responseType: 'json'
    }).then(function(response) {
             return response.data;
           });
  };
  return {
    search: search
  };
});

原因は、angularjsの$httpのパラメータのurlの最後に.jsをつけると解決。

      url:'/sample/index.js',