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

i creating api using drf-nested-routers application django rest framework. application tracker users have sessions , tasks. each user can have 3 active tasks , can work on each of these tasks in 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 following (abbreviated) serializers 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 have views.py , urls.py set routing properly.

i can navigate sessions , tasks api views fine. however, whenever try navigate user view, throws following error:

'user' object has no attribute 'tasks'. 

what's interesting, though, if remove 'tasks' , include sessions, serializes fine , gives me nested view of user's various sessions.

i'm @ loss here , appreciate assistance.

i rubber-ducked wife , figured out problem.

i had 'related_name="sessions"' in foreignkey field user in models.py.

i missing information in foreignkey field in task model.

hopefully else stumbles on , can learn mistake.