Where in Django Charfield() is max_length defined as compulsory?

Question

I have a Django app and trying to understand the logic on how to read docs correctly in order to e.g. create a Charfield object.

So here is my model:

from django.db import models class Person(models.Model): f_name = models.CharField() . . . . . .

If I run the app I get the error:

Charfields must define a 'max_length' attribute

I get that I need to do:

f_name = models.CharField(max_length=40)

But why? when I read the code for Charfield it's not there, so I read the code for its superclass Field but I don't see where max_length is set to be compulsory!

Please assist (new to oop)

AKX · Accepted Answer · 2022-10-07 09:53:42Z

Technically, the check is right here in the definition of CharField, as a Django system check (def _check_max_length_attribute(self, **kwargs):):

def _check_max_length_attribute(self, **kwargs): if self.max_length is None: return [ checks.Error("CharFields must define a 'max_length' attribute.", obj=self, id="fields.E120", ) ] # ...

It's hooked up to be a Django system check for CharFields in the check function just above.

For future reference, I found it by just searching for CharFields must define a in the Django code base.

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