Standarize error response

KawowyDzienniczek/App/user/serializers.py

@@ -17,8 +17,11 @@ class AuthTokenSerializerByEmail(serializers.Serializer):
     def validate(self, attrs):
         email = attrs.get('email')
         password = attrs.get('password')
-        queryset = User.objects.all()
-        user_by_email = get_object_or_404(queryset, email__iexact=email)
+        user_query = User.objects.filter(email__iexact=email)
+        if not user_query:
+            msg = _('Unable to log in with provided credentials.')
+            raise serializers.ValidationError(msg)
+        user_by_email = user_query[0]
         if user_by_email and password:
             user = authenticate(username=user_by_email.username, password=password)