Get serializer data by foreign key - django

Question

I need to pass data from EmployeeSerializer to VacationSerializer as nested json. This is my serializer.py:
class EmployeeSerializer(serializers.ModelSerializer):
class Meta:
model = Employee
fields = ('pk', 'first_name', 'surname', 'patronymic', 'birthday', 'email', 'position', 'phone_number')
class VacationSerializer(serializers.ModelSerializer):
class Meta:
model = Vacation
fields = ('pk', 'start_date', 'end_date', 'employee_id', 'employee')
and my models.py:
class Employee(models.Model):
first_name = models.CharField("Name", max_length=50)
surname = models.CharField("surname", max_length=50)
patronymic = models.CharField("patronymic", max_length=50)
birthday = models.DateField()
email = models.EmailField()
position = models.CharField("position", max_length=128)
phone_number = models.CharField("phone", max_length=12, null=True)
is_deleted = models.BooleanField(default=False)
def __str__(self):
return f'{self.surname} {self.first_name} {self.patronymic}'
class Vacation(models.Model):
start_date = models.DateField()
end_date = models.DateField()
employee_id = models.ForeignKey(Employee, related_name='employee', on_delete=models.PROTECT, default=-1)
def __str__(self):
return f'{self.start_date} - {self.end_date}'
#property
def date_diff(self):
return (self.end_date - self.start_date).days
in views.py I have this:
#api_view(['GET', 'POST'])
def vacations_list(request):
if request.method == 'GET':
data = Vacation.objects.all()
serializer = VacationSerializer(data, context={'request': request}, many=True)
return Response(serializer.data)
I've tried this:
class VacationSerializer(serializers.ModelSerializer):
employee = EmployeeSerializer(read_only=True, many=True)
class Meta:
model = Vacation
fields = ('pk', 'start_date', 'end_date', 'employee_id', 'employee')
but it doesn't show me even empty nested json, it shows me only VacationSerializer data.
I easily can access VacationSerializer from EmployeeSerializer using PrimaryKeySerializer or any other serializer and get nested json where VacationSerializer data is nested in EmployeeSerializer data. But I want it opposite - nested json of employee related to this vacation. How to achieve this?

Answer 1

That is because of the naming on your model. You need to serialize the 'employee_id' field:
class VacationSerializer(serializers.ModelSerializer):
employee_id = EmployeeSerializer()
class Meta:
model = Vacation
fields = ('pk', 'start_date', 'end_date', 'employee_id')