CODEWITHSUNDEEP
pythondjangodjango-rest-frameworkdrf-nested-routers
Neighlyd
Neighlyd

Reputation: 352

Django drf-nested-routers - model object has no attributed related field

I am creating an API using the drf-nested-routers application for Django Rest Framework. This application is a tracker where users have sessions and tasks. Each user can have three active tasks and can work on each of these tasks in a given session.

My (abbreviated) models are:

#models.py
class User(models.Model):
    name = models.Charfield()

class Task(models.Model):
    start_date = models.Datefield()
    task_title = models.Charfield()
    user = models.ForeignKey(User, on_delete=models.CASCADE)

class Session(models.Model):
    session_date = models.Datefield()
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='sessions')
    task_one = models.ForeignKey(related_name="task_one")
    task_one_attempts = models.IntegerField()
    task_two = models.ForeignKey(related_name="task_two")
    task_two_attempts = models.IntegerField()

I have created the following (abbreviated) Serializers for these models:

#serializers.py
class TaskSerializer(serializers.ModelSerializer):
     user = serializers.StringRelatedField(many=False)

    class Meta:
        model = Task
        fields = ('start_date', 'task_title', 'user')

 class SessionSerializer(serializers.ModelSerializer):
      user = Serializers.StringRelatedField(many=False)

      class Meta:
           model = Session
           fields = ('session_date', 'user', 'task_one', 'task_one_attempts', 'task_two', 'task_two_attempts')

class UserSerializer(models.ModelSerializer):
    sessions = SessionSerializer(many=True)
    tasks = TaskSerializer(many=True)
    sessions = SessionSerializer(many=True)

    class Meta:
         model = Users
         fields = ('name', 'sessions', 'tasks')

I also have my views.py and urls.py set up to do the routing properly.

I can navigate to the sessions and tasks API views just fine. However, whenever I try to navigate to the user view, it throws the following error:

'User' object has no attribute 'tasks'.

What's really interesting, though, is that if I remove 'tasks' and just include sessions, it serializes everything just fine and gives me a nested view of the User's various sessions.

I'm at a loss here and would appreciate any assistance.

Upvotes: 0

Views: 451

Answers (1)

Neighlyd
Neighlyd

Reputation: 352

I rubber-ducked it with my wife and figured out my problem.

I had 'related_name="sessions"' in my ForeignKey field for user in models.py.

I was missing that information in the ForeignKey field in the task model.

Hopefully someone else stumbles on this and can learn from my mistake.

Upvotes: 2

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