I get the following error when I try to run an insert into one of my tables.
Cannot assign "1": "Team.department_id" must be a "Department" instance
Admittedly I'm slightly unsure if I'm using the foreign key concept correctly. The insert I'm trying to run and a snippet from my models.py are given below.
What I'm trying to do is that when someone wants to create a new team. They have to attach it to a department. Therefore the department ID should be in both sets of tables.
new_team = Team(
nickname = team_name,
employee_id = employee_id,
department_id = int(Department.objects.get(
password = password,
department_name = department_name
).department_id))
models.py
class Department(models.Model):
department_id = models.AutoField(auto_created=True,
primary_key=True,
default=1)
department_name = models.CharField(max_length=60)
head_id = models.CharField(max_length=30)
password = models.CharField(max_length=128)
class Team(models.Model):
team_id = models.AutoField(primary_key=True)
department_id = models.ForeignKey('Department',
related_name = 'Department_id')
employee_id = models.CharField(max_length=30)
nickname = models.CharField(max_length=60)
team_image = models.ImageField(upload_to=get_image_path,
blank=True, null=True)
You don't need to pass the department id, the instance itself is enough.
The following should work just fine:
new_team = Team(
nickname = team_name,
employee_id = employee_id,
department_id = Department.objects.get(password = password,
department_name = department_name))
Just a note: don't ever name your foreign fields something_id.
That something is enough. Django is meant to make things easy from the user's perspective and the _id
suffix means you're thinking of the database layer. In fact, if you named your column department
, django will automatically create department_id
column in the database for you.
The way things are, you're making Django create department_id_id
which is rather silly.