I have models like following:
class Task(models.Model):
what_task = models.CharField(max_length=100, )
#This helps to print in admin interface
def __str__(self):
return u"%s" % (self.what_task)
class Step(models.Model):
task = models.ForeignKey(Task, related_name='steps', on_delete=models.CASCADE, )
what_step = models.CharField(max_length=50, blank=True, )
#This helps to print in admin interface
def __str__(self):
return u"%s" % (self.what_step)
I have serializers:
class StepSerializer(serializers.ModelSerializer):
class Meta:
model = Step
fields = '__all__'
class TaskSerializer(serializers.ModelSerializer):
steps = StepSerializer(many=True)
class Meta:
model = Task
fields = '__all__'
def create(self, validated_data):
steps_data = validated_data.pop('steps')
task = Task.objects.create(**validated_data)
for step_data in steps_data:
Step.objects.create(task=task, **step_data)
return task
and my views:
@api_view(['GET', 'POST'])
def task_list(request):
"""
List all tasks, or create a new task.
"""
if request.method == 'GET':
tasks = Task.objects.all()
serializer = TaskSerializer(tasks, many=True)
return Response(serializer.data)
elif request.method == 'POST':
serializer = TaskSerializer(data=request.data)
if serializer.is_valid():
serializer.save()
return Response(serializer.data, status=status.HTTP_201_CREATED)
else:
return Response(
serializer.errors, status=status.HTTP_400_BAD_REQUEST)
I am expecting that when I create a Task, I also create it's Steps in a single request. My request JSON sent from frontend looks like following:
{what_task: "Sample task three", steps:[{task: 0, what_step: "Test Step"}]}
This throws me {"steps":[{"task":["This field is required."]}]} error. What am I doing wrong? Am I sending wrong JSON?
P.S.: As I do not have a task id at the time of creation, I was sending 0, what should be correct value, how am I suppose to handle it on backend?
The StepSerializer is expecting to receive a Task id. In your situation, it is not required as you grab it from the parent serializer (TaskSerializer).
Just modify your StepSerializer to exclude the task field:
class StepSerializer(serializers.ModelSerializer):
class Meta:
model = Step
exclude = ('task',)
You may also set that field as read_only if you want to display but it should not be necessary as it is included in the Task.
In any case you may omit the task field in steps when creating the task (any value you set will be ignored anyway).
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