validation - Django Rest Framework - how to create custom error messages for all ModelSerializer fields? -

this serializers.py (i want create serializer built-in user model):

from rest_framework import serializers  django.contrib.auth.models import user  class userserializer(serializers.modelserializer):      class meta:         model = user         fields = ('username', 'password', 'email', ) 

i'm aware django rest framework has it's own field validators, because when try create user using username exists, raises error saying:

{'username': [u'this field must unique.']} 

i want customize error message , make "this username taken. please try again" rather saying "this field must unique".

it has built-in regex validator, because when create username exclamation mark, says:

{'username': [u'enter valid username. value may contain letters, numbers , @/./+/-/_ characters.']} 

i want customize regex validator says "invalid username".

how customize of error messages each field has?

note: according post: custom error messages in django rest framework serializer can do:

class userserializer(serializers.modelserializer):     class meta:         model = user      def __init__(self, *args, **kwargs):         super(userserializer, self).__init__(*args, **kwargs)          self.fields['username'].error_messages['required'] = u'my custom required msg' 

but do 'unique' , 'regex' validators? tried doing

self.fields['username'].error_messages['regex'] = u'my custom required msg' 

and

self.fields['username'].error_messages['validators'] = u'my custom required msg' 

but neither worked.

in order replace unique or regex error messages should change message member of corresponding validator object. done using separate mixin class:

from django.core.validators import regexvalidator rest_framework.validators import uniquevalidator django.utils.translation import ugettext_lazy _   class setcustomerrormessagesmixin:     """     replaces built-in validator messages messages, defined in meta class.      mixin should inherited before actual serializer class in order call __init__ method.      example of meta class:      >>> class meta:     >>>     model = user     >>>     fields = ('url', 'username', 'email', 'groups')     >>>     custom_error_messages_for_validators = {     >>>         'username': {     >>>             uniquevalidator: _('this username taken. please, try again'),     >>>             regexvalidator: _('invalid username')     >>>         }     >>>     }     """     def __init__(self, *args, **kwargs):         # noinspection pyargumentlist         super(setcustomerrormessagesmixin, self).__init__(*args, **kwargs)         self.replace_validators_messages()      def replace_validators_messages(self):         field_name, validators_lookup in self.custom_error_messages_for_validators.items():             # noinspection pyunresolvedreferences             validator in self.fields[field_name].validators:                 if type(validator) in validators_lookup:                     validator.message = validators_lookup[type(validator)]      @property     def custom_error_messages_for_validators(self):         meta = getattr(self, 'meta', none)         return getattr(meta, 'custom_error_messages_for_validators', {}) 

then inherit mixin , update meta class:

class userserializer(setcustomerrormessagesmixin, serializers.hyperlinkedmodelserializer):     class meta:         model = user         fields = ('url', 'username', 'email', 'groups')         custom_error_messages_for_validators = {             'username': {                 uniquevalidator: _('this username taken. please, try again'),                 regexvalidator: _('invalid username')             }         }