Get name of primary field of Django model

Question

In Django, every model has a pseudo attribute pk , that points to the field that is declared as primary key.

class TestModel(models.Model):
    payload = models.Charfield(max_length=200)

In this model, the pk attribute would point to the implicit id field, that is generated if no field is declared to be the primary.

class CustomPK(models.Model)
    primary = models.CharField(max_length=100, primary=True)
    payload = models.Charfield(max_length=200)

In this model, the pk attribute would point to the explicit defined primary key field primary

So my question is, how can I get the name of the field, that is the primary key?

Answer 1

You will also have an attribute "name" on the pk-attribute. This seems to hold the name of the Field.

CustomPK._meta.pk.name

In my case I get the value "id" as result (like it should). :-)

Answer 2

Field objects have a primary_key attribute

for field in CustomPK._meta.fields:
  print field.primary_key
  print field.name


# True
# primary
# False
# payload