Can I make an admin field not required in Django without creating a form?

python django django-models django-admin django-forms

Every time I enter in a new player in the Admin portion of Django I get an error message that says "This field is required.".

Is there a way to make a field not required without having to create a custom form? Can I do this within models.py or admin.py?

Here's what my class in models.py looks like.

class PlayerStat(models.Model):
    player = models.ForeignKey(Player)

    rushing_attempts = models.CharField(
        max_length = 100,
        verbose_name = "Rushing Attempts"
        )
    rushing_yards = models.CharField(
        max_length = 100,
        verbose_name = "Rushing Yards"
        )
    rushing_touchdowns = models.CharField(
        max_length = 100,
        verbose_name = "Rushing Touchdowns"
        )
    passing_attempts = models.CharField(
        max_length = 100,
        verbose_name = "Passing Attempts"
        )

Thanks

The simplest way is by using the field option blank=True (docs.djangoproject.com/en/dev/ref/models/fields/#blank). Is there a reason why that won't work?

fabrizioM

Just Put

blank=True

in your model i.e.:

rushing_attempts = models.CharField(
        max_length = 100,
        verbose_name = "Rushing Attempts",
        blank=True
        )

Be aware that if you use "forms", the blank=true will not work. E.g. here the blank= true from the model will not work: class MusModelForm( forms.ModelForm ): name = forms.CharField( widget=forms.Textarea ) #~ mitglieder = forms.CharField( widget=forms.Textarea ) class Meta: model = Musician

If the field is set blankable in model level, it really means empty string are allowed. An empty string and a null really aren't the same thing. Don't break your data integrity only because the framework has set some bad default features. Instead of setting the blank, override the get_form -method: stackoverflow.com/a/70212909/784642

Dawn T Cherian

Use blank=True, null=True

class PlayerStat(models.Model):
    player = models.ForeignKey(Player)

    rushing_attempts = models.CharField(
        max_length = 100,
        verbose_name = "Rushing Attempts",
        blank=True,
        null=True
        )
    rushing_yards = models.CharField(
        max_length = 100,
        verbose_name = "Rushing Yards",
        blank=True,
        null=True
        )
    rushing_touchdowns = models.CharField(
        max_length = 100,
        verbose_name = "Rushing Touchdowns",
        blank=True,
        null=True
        )
    passing_attempts = models.CharField(
        max_length = 100,
        verbose_name = "Passing Attempts",
        blank=True,
        null=True
        )

You should not need "null=True" on CharFields at least from Django 1.6 forward, probably even earlier. Similarly for TextField, SlugField, EmailField, ... anything that is stored as text.

Django doesn't recommend "null=True" for fields strictly containing text.

@Paullo "Avoid using null on string-based fields such as CharField and TextField. If a string-based field has null=True, that means it has two possible values for “no data”: NULL, and the empty string. In most cases, it’s redundant to have two possible values for “no data;” the Django convention is to use the empty string, not NULL. One exception is when a CharField has both unique=True and blank=True set. In this situation, null=True is required to avoid unique constraint violations when saving multiple objects with blank values." docs.djangoproject.com/en/2.1/ref/models/fields/#null

Although the rationale is unconvincing to me. :)

@MassoodKhaari I see what you mean and I agree with you that "rationale is unconvincing".

niko.makela

Instead of setting the blank, override the get_form -method:

    def get_form(self, request, obj=None, **kwargs):
        form = super().get_form(request, obj, **kwargs)
        form.base_fields["rushing_attempts"].required = False

not answered enough - explain how it is used practically, why using super()? Newcomers to django can't understand the answer

Can I make an admin field not required in Django without creating a form?

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