saving model to database throw ValueError in django [closed]

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I have two model employee and department. Employee has one to one connection with department like

class Employee(models.Model): 
      department = models.ForeignKey(to=Department, on_delete=models.CASCADE)

but when I try to create object from rest request, it throws

ValueError: Cannot assign "{'id': 1, 'name': 'wrewrwerwe'}": "Employee.department" must be a "Department" instance.

Can you share the code fragment (likely view) where you create the Employee model object. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented May 14, 2021 at 10:50

AlexTorx · Accepted Answer · 2021-05-14 11:25:04Z

1

I guess you are posting a JSON, with a field department which is the primary key of the department you want to link (or a JSON representing the department).

When creating your model, you must not provide the primary key of the department for the department keywork, but provide a Department object.

In your view, you should do :

# You have data like : {"department": {"id": 1, "name": "wrewrwerwe"}, with 1 the department's PK
department = Department.objects.get(pk=data["department"]["id"])
employee = Employee(department=department)
employee.save()   # Should work

answered May 14, 2021 at 11:25

AlexTorx

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