Django-Rest-Framework-如何反序列化自定义嵌套字段

Question

I have a model called 'Invite' that searches for an existing user and creates one if they do not already exist:

from django.contrib.gis.db import models
from users.models import CustomUser

class Hangout(models.Model):
  name = models.CharField(max_length=255)

class InviteManager(models.Manager):
  def create_invite(self, hangout, phone):
    (user, did_create) = CustomUser.objects.get_or_create(phone=phone)
    invite = self.create(status=status, hangout=hangout, arrival_time=arrival_time, user=user)
    return invite

class Invite(models.Model):
  hangout = models.ForeignKey(Hangout, on_delete=models.CASCADE, related_name='invites')
  user = models.ForeignKey(CustomUser)

  objects = InviteManager()

I am having a lot of trouble deserializing it. I'd like to create a hangout with nested invites with this post request:

{ 'name': 'Bobs House',
  'invites': [
             { 'phone': '5127914819', 'name': 'Bob1' },
             { 'phone': '0000000000', 'name': 'Bob2' },
             { 'phone': '0000000001', 'name': 'Bob3' },
             { 'phone': '0000000002', 'name': 'Bob3' },
             { 'phone': '0000000003', 'name': 'Bob4' }
             ]
}

I want the Invite serializer to check that phone exists and is 10 digits long. I am having a lot of trouble setting up a sequence of serializers to work. I have tried combinations of the solutions here and here , but the combination of nested deserializers and custom create fields that are not on the model at all is driving me nuts. Any help is much appreciated! Thanks

Answer 1

I ended up using an serializer with different fields than those on the model. Here is the working code in case it helps someone:

from rest_framework import serializers
from . import models
from users.models import CustomUser

class InviteSerializer(serializers.ModelSerializer):
  phone = serializers.CharField()
  name = serializers.CharField(required=False)

  class Meta:
    extra_kwargs = { 'name': { 'read_only': True },
                     'phone': { 'read_only': True }}

    fields = (
      'phone',
      'name',
      )
    model = models.Invite

  def validate(self, data):
    return data

  def create(self, validated_data):
    phone = validated_data.pop('phone')
    name = validated_data.pop('name', None)
    (user, did_create) = CustomUser.objects.get_or_create(phone=phone)
    if (user.display_name is None) and (name is not None):
      user.display_name = name
    user.save()
    instance = self.Meta.model.objects.create(user=user, hangout=validated_data['hangout'])
    instance.save()

class HangoutSerializer(serializers.ModelSerializer):
  name = serializers.CharField(required=True)
  invites = InviteSerializer(many=True)

  class Meta: 
    extra_kwargs = { 'phones': {'write_only': True, 'required': True } }

    fields = (
      'invites',
      'name',
      )

    model = models.Hangout

  def create(self, validated_data):
    invites_data = validated_data.pop('invites')
    instance = self.Meta.model(**validated_data)
    instance.save()

    serializer = InviteSerializer(data=invites_data, many=True)
    if serializer.is_valid(raise_exception=True):
      invites = serializer.save(hangout=instance)
      return instance