I have model field foreign key to self
but sql have error and cant create null field for field
why?
class Category(models.Model):
title = models.CharField(max_length=250,\
unique=True, verbose_name=_("Title"))
slug = models.SlugField(max_length=100,\
verbose_name=_("Slug"),\
help_text=_("This Field will fill\
automaticaly by title"))
parent = models.ForeignKey('self', blank=True, null=True,
verbose_name=_("parent"))
thanks
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