title: Django rest frame work; Combining data from different models doesnot work
body: <p>I tried combining data from two models. the serializers look like this.</p>
  
  <pre><code>
  class FindOwnerSaveSerializer(serializers.ModelSerializer):
  
  
  
      class Meta:
          model = User
          fields = ('id', 'username', 'first_name', 'last_name','image')
          #fields = ('__all__')
  
  class SaveSerializer(serializers.ModelSerializer):
  
      content = FindOwnerSaveSerializer(source='user',read_only=True)
  
      class Meta:
          model = Save
          fields = ('project_id','content')
  
  </code></pre>
  
  <p>The save model looks like this</p>
  
  <pre><code>class Save(models.Model):
      project_id = models.ForeignKey(Project, on_delete=models.DO_NOTHING)
      user_id = models.ForeignKey(User, on_delete=models.DO_NOTHING)
  </code></pre>
  
  <p>and the view looks like this</p>
  
  <pre><code>
  class SaveView(UpdateAPIView):
      serializer_class = SaveSerializer
      permission_classes = [IsAuthenticated]
  
      def get_queryset(self):
          try:
              return Save.objects.filter(user_id=self.request.user)
          except Exception as e:
              logger.error(e)
              return Response(data='false')
  
      def get_object(self):
          try:
              if Project.objects.get(project_id=self.request.data['project_id']):
                  return Response(data='true')
          except Exception as e:
              logger.error(e)
              return Response(data='false ')
  
  </code></pre>
  
  <p>the response keep looking like this. No user data is comming in.</p>
  
  <pre><code>[
      {
          "project_id": 78
      }
  ]
  
  
  </code></pre>
  
  <p>What could be the problem.Iam using django 2.2.7 and rest framwework 3.10.3.</p>