django - How to you pass a validation error to a template -

i have ip validation rule such :

>>> validate_ipv46_address("1.1.1") traceback (most recent call last):   file "<console>", line 1, in <module>   file "/usr/local/lib/python2.7/site-packages/django/core/validators.py", line 125, in validate_ipv46_address     raise validationerror(_('enter valid ipv4 or ipv6 address.'), code='invalid') validationerror: [u'enter valid ipv4 or ipv6 address.'] 

and have form functioning like...

class cachecheck(forms.form):     type = forms.typedchoicefield(choices=type_choices, initial='fixed')     record = forms.typedchoicefield(choices=record_choices, initial='fixed')     hostname = forms.charfield(max_length=100)      validate_hostname = regexvalidator(regex=r'[a-za-z0-9-_]*\.[a-za-z]{2,6}')      def clean(self):         cleaned_data = super(cachecheck, self).clean()         record = cleaned_data.get("record")         hostname = cleaned_data.get("hostname", "")          if record == "ptr":             validate_ipv46_address(hostname)         elif record == "a":             validate_hostname(hostname)          return cleaned_data 

however there few things im unclear on. if enter incorrect ip still passes me cleaned data. cleaned_data method ? how pass validation errors template ?

thanks,

according django documentation code should work , display "an error message @ top of form". won't display error @ correct input element though.

there alternative approach try. assumed validate_ipv46_address() , validate_hostname() return boolean instead of raising exception:

def clean(self):     cleaned_data = super(cachecheck, self).clean()     record = cleaned_data.get("record")     hostname = cleaned_data.get("hostname", "")      if record == "ptr" , not validate_ipv46_address(hostname):         msg = "enter valid ipv4 or ipv6 address."     elif record == "a" , not validate_hostname(hostname):         msg = "enter valid hostname."      if msg:                     self._errors["hostname"] = self.error_class([msg])         del cleaned_data["hostname"]      return cleaned_data