optional fields in django models -


i have following model in django. 

class link(models.model):     name = models.charfield(max_length=100)     url = models.charfield(max_length=100)     tag = models.charfield(max_length=100)      def __unicode__(self):         return self.name

i need url field optional. how do this?

add attribute blank=true. optionally, can make field nullable null=true.


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