python - Django serializers: validate function not called -

i trying override validate() function called serializers.is_valid(), not getting called.

serializer.py

class loginserializer(serializers.serializer):     email = serializers.emailfield(max_length=255,required=true)     password = serializers.charfield(max_length=128,required=true)       def validate(self,data):        '''        check invalid email.        & blank email , password.         '''         print 'hey in login'         if data['email'] '':            raise serializers.validationerror("email cannot empty.")        if data['password'] '':           raise serializers.validationerror("password cannot empty.")        try:           validate_email(data['email'])        except validationerror:           raise serializers.validationerror("the email not valid email address.")        return data 

views.py

class loginapi(apiview):     permission_classes = (permissions.allowany,)     serializer = loginserializer      def post(self, request):        data = self.serializer(data=request.data)        if data.is_valid():           #do        else:            return response(data.errors,status=status.http_400_bad_request) 

while call is_valid(), print statement inside validate() function not getting executed. doing wrong?

i think not getting print statements because validate function not being called.

if there error in 1 of fields email, validate function won't called since didn't pass raise_exception=true argument in is_valid not getting errors , assume is_valid not running.

you write post method following:

def post(self, request):    serializer = self.serializer(data=request.data)     # following automatically raise exception if serialize data not valid    serializer.is_valid(raise_exception=true)     # if serializer valid 

update: if want raise specific message after validating different fields, create method validate_<fieldname> in serializer:

def validate_email(self, value):      if value == '':         raise serializers.validationerror("email cannot empty.")      try:         validate_email(value)     except validationerror:         raise serializers.validationerror("the email not valid email address.")      return value