title: 'str' object is not callable Django Rest Framework
body: <p>I'm trying to create an API view but I'm getting an error. Can anyone help?</p>
  
  <p>urls.py:</p>
  
  <pre><code>app_name = 'ads'
  urlpatterns = [
      # ex: /ads/
      url(r'^$', views.ListBrand.as_view(), name='brand_list'),
  ]
  </code></pre>
  
  <p>views.py:</p>
  
  <pre><code>from rest_framework.views import APIView
  from rest_framework.response import Response
  from . import models
  from . import serializers
  
  
  class ListBrand(APIView):
      def get(self, request, format=None):
          brands = models.Brand.objects.all()
          serializer = serializers.BrandSerializer(brands, many=True)
          data = serializer.data
          return Response(data)
  </code></pre>
  
  <p>UPDATE: HERE IS THE ERROR, it is a string error. And I can't seem to find where its coming from.</p>
  
  <pre><code>TypeError at /api/v1/ads/
  'str' object is not callable
  Request Method: GET
  Request URL:    http://localhost/api/v1/ads/
  Django Version: 1.10.2
  Exception Type: TypeError
  Exception Value:    
  'str' object is not callable
  Exception Location: C:\Users\Leon\Desktop\esriom\lib\site-packages\rest_framework\views.py in &lt;listcomp&gt;, line 264
  Python Executable:  C:\Users\Leon\Desktop\esriom\Scripts\python.exe
  Python Version: 3.5.2
  Python Path:    
  ['C:\\Users\\Leon\\Desktop\\esirom',
   'C:\\Users\\Leon\\Desktop\\esriom\\lib\\site-packages\\setuptools-18.1-py3.5.egg',
   'C:\\Users\\Leon\\Desktop\\esriom\\lib\\site-packages\\pip-7.1.0-py3.5.egg',
   'C:\\Users\\Leon\\Desktop\\esriom\\Scripts\\python35.zip',
   'C:\\Users\\Leon\\AppData\\Local\\Programs\\Python\\Python35-32\\DLLs',
   'C:\\Users\\Leon\\AppData\\Local\\Programs\\Python\\Python35-32\\lib',
   'C:\\Users\\Leon\\AppData\\Local\\Programs\\Python\\Python35-32',
   'C:\\Users\\Leon\\Desktop\\esriom',
   'C:\\Users\\Leon\\Desktop\\esriom\\lib\\site-packages']
  Server time:    Fri, 7 Oct 2016 12:44:04 -0500
  </code></pre>
  
  <p>HERE IS THERE TRACEBACK TOO</p>
  
  <pre><code>Environment:
  
  
  Request Method: GET
  Request URL: http://localhost/api/v1/ads/
  
  Django Version: 1.10.2
  Python Version: 3.5.2
  Installed Applications:
  ['rest_framework',
   'ads.apps.AdsConfig',
   'django.contrib.admin',
   'django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.messages',
   'django.contrib.staticfiles']
  Installed Middleware:
  ['django.middleware.security.SecurityMiddleware',
   'django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.common.CommonMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware',
   'django.middleware.clickjacking.XFrameOptionsMiddleware']
  
  
  
  Traceback:
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\django\core\handlers\exception.py" in inner
    39.             response = get_response(request)
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\django\core\handlers\base.py" in _get_response
    187.                 response = self.process_exception_by_middleware(e, request)
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\django\core\handlers\base.py" in _get_response
    185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\django\views\decorators\csrf.py" in wrapped_view
    58.         return view_func(*args, **kwargs)
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\django\views\generic\base.py" in view
    68.             return self.dispatch(request, *args, **kwargs)
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\rest_framework\views.py" in dispatch
    457.         request = self.initialize_request(request, *args, **kwargs)
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\rest_framework\views.py" in initialize_request
    364.             authenticators=self.get_authenticators(),
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\rest_framework\views.py" in get_authenticators
    264.         return [auth() for auth in self.authentication_classes]
  
  File "C:\Users\Leon\Desktop\esriom\lib\site-packages\rest_framework\views.py" in &lt;listcomp&gt;
    264.         return [auth() for auth in self.authentication_classes]
  
  Exception Type: TypeError at /api/v1/ads/
  Exception Value: 'str' object is not callable
  </code></pre>