Django Rest Framework将对象附加到多个字段中，而不删除前一个字段
Django Rest Framework将对象附加到多个字段中，而不删除前一个字段
提问于 2021-04-03 12:07:11
我是DRF的新手，不知道如何在不删除前一个字段的情况下将一个对象附加到多个字段中。
我使用修补程序更新字段监视器，但是前面的值被实际值所替代。我想把它加上去。
API GET是：
{
"id": 1,
"created": "2018-05-02T23:43:07.605000Z",
"modified": "2021-04-03T10:25:12.280896Z",
"companies_house_id": "",
"name": "Ellison PLC",
"description": "",
"date_founded": "2018-04-28",
"country": 4,
"creator": 7,
"monitors": [
3
]
}在PATCH {"monitors":[11]}之后，我得到：
{
"id": 1,
"created": "2018-05-02T23:43:07.605000Z",
"modified": "2021-04-03T10:25:12.280896Z",
"companies_house_id": "",
"name": "Ellison PLC",
"description": "",
"date_founded": "2018-04-28",
"country": 4,
"creator": 7,
"monitors": [
11
]
}我希望最终的GET API是"monitors": [3, 11]
models.py
class Company(TimeStampedModel):
companies_house_id = models.CharField(max_length=8, blank=True)
name = models.CharField(max_length=200, blank=True)
description = models.TextField(blank=True)
date_founded = models.DateField(null=True, blank=True)
country = models.ForeignKey(Country, on_delete=models.PROTECT, blank=True)
creator = models.ForeignKey(
settings.AUTH_USER_MODEL,
on_delete=models.SET_NULL,
null=True,
related_name='companies_created'
)
monitors = models.ManyToManyField(
settings.AUTH_USER_MODEL,
blank=True,
related_name='companies_monitored',
help_text='Users who want to be notified of updates to this company'
)
def __unicode__(self):
return u'{0}'.format(self.name)serializers.py
from rest_framework import serializers
from .models import Company
from django.contrib.auth import get_user_model
class CompanySerializer(serializers.ModelSerializer):
class Meta:
model = Company
fields = '__all__'
class UserSerializer(serializers.ModelSerializer):
companies_monitored = CompanySerializer(many=True, read_only=True)
# companies_moniotred = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
class Meta:
model = get_user_model()
fields = ('id', 'username', 'companies_monitored')views.py
class CompanyDetailsView(generics.RetrieveUpdateAPIView):
queryset = Company.objects.all()
serializer_class = CompanySerializer
class UserList(generics.ListCreateAPIView):
queryset = get_user_model().objects.all()
serializer_class = UserSerializer
class UserDetail(generics.RetrieveUpdateDestroyAPIView):
queryset = get_user_model().objects.all()
serializer_class = UserSerializer
def get_object(self, username):
username = get_object_or_404(get_user_model(), username=username)
return username
def get(self, request, username):
username = self.get_object(username)
serializer = UserSerializer(username)
return Response(serializer.data)urls.py
from django.conf.urls import url
from django.urls import path
from . import views
from .views import CompanyDetailsView, UserList, UserDetail
urlpatterns = [
path('details/<int:pk>/', CompanyDetailsView.as_view(), name='company_details'),
path('users/<str:username>/', UserDetail.as_view(), name='profile_view'),
]回答 2
Stack Overflow用户
回答已采纳
发布于 2021-04-04 09:33:42
对PATCH方法使用不同的序列化程序。
class CompanyDetailsView(generics.RetrieveUpdateAPIView):
queryset = Company.objects.all()
serializer_class = CompanySerializer
def get_serializer_class(self):
if self.request.method == 'PATCH':
return CompanyPatchSerializer
return self.serializer_class并处理序列化程序中所需的内容。
class CompanyPatchSerializer(serializers.ModelSerializer):
class Meta:
model = Company
fields = '__all__'
@transaction.atomic
def update(self, instance, validated_data):
if 'monitors' in validated_data:
monitor_ids = validated_data.pop('monitors')
# todo: handle get_or_create
return super().update(instance, validated_data)我不喜欢隐式m2m模型，所以我的建议也是添加through模型。
Stack Overflow用户
发布于 2021-04-04 09:37:02
我不建议重写修补程序方法，但是下面的代码应该可以完成此工作。
def patch(self, request, *args, **kwargs):
request.data._mutable = True
new_monitors = request.data.get('monitors')
existing_monitors = Company.objects.get(kwargs.get('id')).values_list('monitors__id', flat=True)
all_monitors = existing_monitors + new_monitors
request.data.update({'monitors': set(all_monitors)})
return self.partial_update(request, *args, **kwargs)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/66930970
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