>From the http://code.djangoproject.com/wiki/NewbieMistakes

Problem ¶

When you have a Field: current_zip =
meta.IntegerField(maxlength=5,blank=True)

django will create a not nullable field in the DB. However leaving the
field blank (in admin/web) django will try and insert a NULL value in
the DB.
Solution ¶

Add null=True:

current_zip = meta.IntegerField(maxlength=5,null=True,blank=True)


I suppose it will do the trick for a ForeignKey too.


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