title: Getting an Assertion error in my django application(1.8.4)
body: <pre><code>from rest_framework import serializers
  from .models import Stock
  
  
  class StockSerializer(serializers.ModelSerializer):
  
      class Meta:
  
          model = Stock
  
          #field = ('ticker','volume')
          field = '__all__'
  </code></pre>
  <p>I am getting an exception value on running application : <code>(&quot;Creating a ModelSerializer without either the 'fields' attribute or the 'exclude' attribute has been deprecated since 3.3.0, and is now disallowed. Add an explicit fields = '__all__' to the StockSerializer serializer.&quot;,) </code></p>