如何使用DRF序列化django中的一些嵌套关系模型？
如何使用DRF序列化django中的一些嵌套关系模型？
提问于 2020-12-19 09:14:07
我有一些不同关系的Django模型-- Many-to-many和Foreignkey。通过这种方式，我希望使用djnago-rest来序列化它们。
以下是模型：
class CommonFieldsAbstract(models.Model):
name = models.CharField(max_length=30, unique=True)
class ServerModel(CommonFieldsAbstract):
server_ip = models.GenericIPAddressField(default='172.17.0.1')
server_port = models.IntegerField(default='9001')
class SNMPLineModel(CommonFieldsAbstract):
ip_address = models.GenericIPAddressField()
port = models.IntegerField(default=161)
class SNMPModel(CommonFieldsAbstract): # target
line = models.ForeignKey(SNMPLineModel, on_delete=CASCADE)
servers = models.ManyToManyField(ServerModel)
class MetaDataModel(models.Model):
key = models.CharField(max_length=20)
value = models.CharField(max_length=20)
snmp_device = models.ForeignKey(SNMPModel, on_delete=CASCADE)在此之前，我曾使用以下方法手动创建JSON：
def meta_data_json(meta_data):
meta_data_list = []
for meta in meta_data:
meta_data_list.append({
meta.key: meta.value
})
return meta_data_list
def server_json(servers):
return [{'ip': server.server_ip,
'port': server.server_port}
for server in servers]
def create_json():
snmp = SNMPModel.objects.filter(name__contains='a-name')
return {
'name': snmp.name,
'address': snmp.line.ip_address,
'port': snmp.line.port,
'servers': server_json(snmp.servers.all()),
'meta_data': meta_data_json(MetaDataModel.objects.filter(
snmp_device=snmp.pk
)
),
'device_pk': snmp.pk
}我的问题是：
现在，我如何通过django-rest-framework创建这样一个这样的json呢？
我对多到多领域没有任何问题。事实上，我的问题是foreignkey。
以下是我迄今所做的工作：
# serializers.py
from rest_framework import serializers
class MetaDataSerializer(serializers.ModelSerializer):
class Meta:
fields = [
'id',
'key',
'value',
]
model = MetaDataModel
class ServerSerializer(serializers.ModelSerializer):
class Meta:
fields = [
'id',
'server_ip',
'server_port',
]
model = ServerModel
class LineSerializer(serializers.ModelSerializer):
port = serializers.RelatedField(many=True)
class Meta:
fields = '__all__'
model = SNMPLineModel
class SNMPSerializer(serializers.ModelSerializer):
servers = ServerSerializer(many=True, read_only=True) # It is ok
meta_data = MetaDataSerializer(many=True, read_only=True) # It's not ok
line = LineSerializer(many=True, read_only=True) # It's not ok
address = serializers.CharField(source=SNMPLineModel.ip_address) # It's not ok
port = serializers.CharField(source=SNMPLineModel.port) # It's not ok
class Meta:
fields = [
'id',
'servers',
'name',
'address',
'port',
'line',
'meta_data'
]
model = SNMPModel# views.py
from django.views.decorators.csrf import csrf_exempt
from django.http import HttpResponse, JsonResponse
@csrf_exempt
def snippet_detail(request, name):
try:
snmp_conf = SNMPModel.objects.filter(name__contains=name)
except SNMPModel.DoesNotExist:
return HttpResponse(status=404)
if request.method == 'GET':
serializer = SNMPSerializer(snmp_conf, many=True)
return JsonResponse(serializer.data, status=200, safe=False)# urls.py
from django.urls import path
urlpatterns = [
path('snippets/<name>/', views.snippet_detail)
]任何帮助都将不胜感激。
Stack Overflow用户
回答已采纳
发布于 2020-12-19 09:56:03
serializers.SerializerMethodField()是添加这样的关系的一种有用方法。get_meta_data()有点神奇，通过计算字段名来调用该方法。
地址和端口似乎是一个简单的关系，line.FOO应该可以工作。
class SNMPSerializer(serializers.ModelSerializer):
servers = ServerSerializer(many=True, read_only=True) # It is ok
meta_data = serializers.SerializerMethodField()
line = serializers.SerializerMethodField()
address = serializers.CharField(source="line.ip_address", read_only=True)
port = serializers.CharField(source="line.port" , read_only=True)
class Meta:
fields = ['id', 'servers', 'name', 'address', 'port', 'line', 'meta_data']
model = SNMPModel
def get_meta_data(self, instance):
metadatamodels = MetaDataModel.objects.filter(snmp_device=instance)
serializer = MetaDataSerializer(instance=metadatamodels, many=True, read_only=True)
return serializer.data
def get_line(self, instance):
serializer = LineSerializer(instance.line, read_only=True)
return serializer.data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/65368285
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