CODEWITHSUNDEEP
pythondjangodjango-models
Martin
Martin

Reputation: 4330

Get name of primary field of Django model

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?

Upvotes: 51

Views: 27731

Answers (2)

zonky
zonky

Reputation: 1078

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). :-)

Upvotes: 70

dm03514
dm03514

Reputation: 55952

Field objects have a primary_key attribute

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


# True
# primary
# False
# payload

Upvotes: 6

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