Django REST Framework (DRF): Set current user id as field value

Question

I have model NewsModel and 2 serializers for him:

models.py

class NewsModel(models.Model):     title = models.CharField('Заголовок', max_length=255, help_text='Максимальная длина - 255 символов')     announce = models.TextField('Анонс', help_text='Краткий анонс новости')     author = models.ForeignKey(settings.AUTH_USER_MODEL, help_text='Автор новости', related_name='news')     full_text = models.TextField('Полный текст новости', help_text='Полный текст новости')     pub_date = models.DateTimeField('Дата публикации', auto_now_add=True, default=timezone.now, help_text='Дата публикации')      def comments_count(self):         return NewsComment.objects.filter(news=self.id).count()      def get_author_full_name(self):         return self.author.get_full_name()      class Meta:         db_table = 'news'         ordering = ('-pub_date',) 

serilizers.py:

from rest_framework import serializers from .models import NewsModel from extuser.serializers import UserMiniSerializer  class NewsReadSerializer(serializers.ModelSerializer):      author = UserMiniSerializer()      class Meta:         model = NewsModel         fields = ('id', 'title', 'announce', 'comments_count', 'reviews', 'author_name')      def get_author_full_name(self, obj):         return obj.get_author_full_name()   class NewsWriteSerializer(serializers.ModelSerializer):      def validate_author(self, value):         value = self.request.user.id         return value      class Meta:         model = NewsModel         

I select serializers in the api.py:

class NewsList(ListCreateAPIView):     queryset = NewsModel.objects.order_by('-pub_date')     def get_serializer_class(self, *args, **kwargs):         if self.request.method == 'GET':             return NewsReadSerializer         return NewsWriteSerializer      class Meta:         model = NewsModel 

But when I will create NewsModel item, I see Error 400: Bad request [{'author': 'This field is required'}]

How I can set current user id as NewsItem.author value on creating new item?

Answer 1

I don't think you're using the serializer properly. A better practice to set request related data is to override perform_create in your view:

def perform_create(self, serializer):     serializer.save(author=self.request.user)  def perform_update(self, serializer):     serializer.save(author=self.request.user) 

and then set your author serializer to read-only:

author = UserMiniSerializer(read_only=True) 

this way you can simply use one single NewsSerializer for both read and write actions.

Answer 2

In new DRF you can write

owner = serializers.HiddenField(     default=serializers.CurrentUserDefault() ) 

See http://www.django-rest-framework.org/api-guide/validators/#currentuserdefault