About Nullable Boolean Fields
If you make a boolean field nullable, it will be rendered in the forms as a select field with three options: "Unknown", "Yes", and "No".
class Survey(models.Model):
user = models.ForeignKey(
User, on_delete=models.CASCADE
)
statement = models.ForeignKey(
Statement, on_delete=models.CASCADE
)
has_agreed = models.BooleanField(null=True, blank=True)
Behind the scenes, it will be using forms.NullBooleanField for the form field.
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