CODEWITHSUNDEEP
djangodjango-modelsdjango-admin
Adilet Maratov
Adilet Maratov

Reputation: 1382

django charfield with default empty string is required in admin

I have a model with a Charfield:

class SomeModel(models.Model):
    charfield = models.Charfield(max_length=5, default="")
    ...

I expect this field to be not required when using in the admin. But when I include this model to the admin, I have this field required. I could use null=True, blank=True, but I'm curious Is it some kind of a bug or am I implementing something wrong?

Upvotes: 3

Views: 13534

Answers (2)

Daniel Roseman
Daniel Roseman

Reputation: 599530

I'm not sure why you think that's a bug. If you don't specify blank=True, some kind of non-empty value is required. The empty string, by definition, is an empty value; so Django quite correctly displays an error telling you to supply an actual value.

You do need to specify blank=True if you want the empty string to be allowed. But you don't need to specify null=True; indeed, as the docs show, you shouldn't use that on CharFields.

Upvotes: 9

Carlos Hernando
Carlos Hernando

Reputation: 319

It's correct. default, null and blank have different meanings.

null allows NULL value on database https://docs.djangoproject.com/en/dev/ref/models/fields/#null

blank allows blank value on the model https://docs.djangoproject.com/en/dev/ref/models/fields/#blank

Additionally, a ModelForm (used by admin) with blank=True sets the required field as false, see https://docs.djangoproject.com/en/dev/topics/forms/modelforms/#field-types

Upvotes: 1

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