Access-Control-Allow-Origin不允许Angularjs Rails- Origin http：// localhost：9000。

Question

I just started out with angularjs and I am using rails as a backend api. I have successfully setup angular rails resouce ( https://github.com/FineLinePrototyping/angularjs-rails-resource ) and rack cors to get data from rails. When I try to save a festival though, I get the following error:

XMLHttpRequest cannot load http://localhost:3000/festivals. Origin http://localhost:9000 is not allowed by Access-Control-Allow-Origin. 

Here's my code,

app/scripts/directives/festival_form.coffee

'use strict'

angular.module('MFNApp')
  .directive 'festivalForm', ->
    return {
      compile: (scope, element, attributes) ->
        console.log 'compile'

      link: (scope, element, attributes) ->
        console.log 'link'

      controller: ($scope, Festival) ->
        $scope.newFestival = new Festival
        console.log $scope.newFestival

        $scope.save = ->
          $scope.newFestival.save().then(
            (festival) ->
              console.log 'success'
              # $scope.festivalForm.$setPristine()
              # $scope.newFestival.$dirty = false
            ,
            (response) ->
              console.log 'failure'
              # $scope.festivalForm.$setValidity(false)
              # angular.forEach response.data, (value, key) ->
              #   $scope.festivalForm.$error[key] = value[0]
          )

    }

Here's the festival factory using angular rails resource

app/scripts/services/Festival.coffee

'use strict'

angular.module('MFNApp')
  .factory 'Festival', (railsResourceFactory) ->
    railsResourceFactory
      url: 'http://localhost:3000/festivals', 
      name: 'festival'

And here is the view

app/views/fesitvals/new.html

<div festival-form>
  <form>
    <fieldset>
      <legend>Festival Information</legend>

      <div class="row">
        <div class="large-12 columns">
          <label>Festival Name</label>
          <input ng-model='newFestival.name' type="text" placeholder="Name of your festival...">
        </div>
      </div>

      <div class="row">
        <div class="large-12 columns">
          <label>Description</label>
          <input ng-model='newFestival.description' type="text" placeholder="About your festival...">
        </div>
      </div>

      <button ng-click='save()'>Save</button>


    </fieldset>
  </form>

</div>

Answer 1

您必须允许Web api接受来自该域（ http://localhost:9000 ）的请求，或者可以按此处所述为所有域打开它， 通过CORS Policy允许任何操作

Answer 2

The error was a little misleading, because it seemed to be a cross origin request error. It was actually just an error in the rails controller. So if you ever hook up rails as a backend to angular and encounter this error, it could just be incorrect rails code. hope this helps!