Re: How to raise integrity error in save method of model

def save(self, *args, **kw):
if not
mdlcountry.objects.filter(country_name=self.country_name).exists():
super(mdlroomtypes, self).save(*args, **kw)
else:
#do something or do nothing
pass

Here in else part how will i set error message that should display to the
user
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