python - django Rest框架如何删除多余的查询？

Question

我使用 Django debug_toolbar 查看 SQL 查询，我想删除第二个 SQL 查询。

1.(SELECT ... FROM auth_user LEFT OUTER JOIN accounts_userextension ON (auth_user.id = accounts_userextension.user_id) 50.86474349085549% 28.30 Sel 
Expl)   
2.(SELECT ... FROM auth_user LIMIT 1000  49.13525650914451%   27.34 Sel  Expl)

这是models.py:

class UserExtension(models.Model):      
    user = models.OneToOneField(User,on_delete=models.CASCADE,related_name='user_detail')
    birthday = models.DateField(null=True,blank=True)

这是serializers.py:

from django.contrib.auth.models import User   
from .models import UserExtension    
class UserExtensionSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserExtension
        fields = '__all__'

class accountDetailSerializer(serializers.ModelSerializer):
    user_detail = UserExtensionSerializer()
    class Meta:
        model = User
        fields = [
            "username",
            "email",
            "first_name",
            'user_detail',
        ]

这是views.py:

class AccountView(generics.ListCreateAPIView):    
    queryset = User.objects.all().select_related('user_detail')
    serializer_class = accountDetailSerializer
    permission_classes = ()

Answer 1

我认为额外的查询是因为user_detail = UserExtensionSerializer()。尝试下面的代码。我没有测试过，但应该可以。

class accountDetailSerializer(serializers.ModelSerializer):
    user_details = UserExtensionSerializer(source='user_detail')
    class Meta:
        model = User
        fields = [
            "username",
            "email",
            "first_name",
            'user_details',
        ]