有多种方法可以做到这一点，但我认为在序列化程序中这样做更好。
我不知道如何向接受many=True的ModelSerializer添加其他字段。这是我所有的代码：
视图集：
def list(self, request, *args, **kwargs):
contracts = self.request.user.all_contracts
serializer = ContractGetSerializer(contracts, many=True, context={'request': request}, )
return Response({"results": serializer.data}, status=status.HTTP_200_OK)
ContractGetSerializer串行器。它还具有内部Many=True字段
class ContractGetSerializer(serializers.ModelSerializer):
files = FileModelSerializer(many=True)
is_author = serializers.SerializerMethodField('is_author_method')
contract_signing_status = serializers.SerializerMethodField('get_recipient_signing_status')
def is_author_method(self, foo):
return foo.owner.id == self.context['request'].user.id
class Meta:
model = Contract
fields = ['id', 'is_author', 'title','contract_signing_status','files', ]
现在，我的ContractGetSerializer返回一个包含所有合约的ReturnList。如何向ReturnList添加其他字段并使其成为字典？
例如，我只需要返回5个最近的合同(按时间戳过滤(。此外，我需要添加total SIGNED contracts和total PENDING contracts，计算所有合同数据，这样我的前端就不需要这样做了。
我当前的JSON:
{
"results": [
{
"id": 178,
"is_author": true,
"title": "ahhzhzh",
"message_to_all_recipients": null,
"contract_signing_status": "WAITING_FOR_ME",
"contract_signing_type": "SIMPLE",
"contract_signing_date": {
"start_date": "2010-09-04T14:15:22Z",
"end_date": "2010-09-04T14:15:22Z"
},
"recipients": [
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "ADMIN"
},
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "BASE"
}
]
},
{
"id": 179,
"is_author": true,
"title": "dhhdhd",
"message_to_all_recipients": null,
"contract_signing_status": "WAITING_FOR_ME",
"contract_signing_type": "SIMPLE",
"contract_signing_date": {
"start_date": "2010-09-04T14:15:22Z",
"end_date": "2010-09-04T14:15:22Z"
},
"recipients": [
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "ADMIN"
},
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "BASE"
}
]
},
]
}
我想要的JSON:
{
"recents_count": 5,
"signed_count": 10,
"results": [
{
"id": 178,
"is_author": true,
"title": "ahhzhzh",
"message_to_all_recipients": null,
"contract_signing_status": "WAITING_FOR_ME",
"contract_signing_type": "SIMPLE",
"contract_signing_date": {
"start_date": "2010-09-04T14:15:22Z",
"end_date": "2010-09-04T14:15:22Z"
},
"recipients": [
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "ADMIN"
},
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "BASE"
}
]
},
{
"id": 179,
"is_author": true,
"title": "dhhdhd",
"message_to_all_recipients": null,
"contract_signing_status": "WAITING_FOR_ME",
"contract_signing_type": "SIMPLE",
"contract_signing_date": {
"start_date": "2010-09-04T14:15:22Z",
"end_date": "2010-09-04T14:15:22Z"
},
"recipients": [
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "ADMIN"
},
{
"message": null,
"recipient_signing_status": "NOT_SIGNED",
"recipient_review_status": "NOT_REQUIRED",
"recipient_action": "SIGN",
"role": "BASE"
}
]
},
]
}
我会做这样的事情：
可视
def list(self, request, *args, **kwargs):
serializer = ContractResultSerializer(self.request.user, context={'request': request}, )
return Response(serializer.data, status=status.HTTP_200_OK)
在串行器
class ContractResultSerializer(serializers.Serializers):
recents_count = serializers.SerializerMethodField()
signed_count = serializers.SerializerMethodField()
results = serializers.SerializerMethodField()
def get_recents_count(self, obj):
# I don't know how is your model looks like to write the query to get the recent count
# but I think it will be something like this
return obj.contracts.filter(your recent condition).count()
def get_signed_count(self, obj):
# is the same as get_recents_count()
def get_results(self, obj):
return ContractGetSerializer(obj.all_contracts, many=True, context={'request': self.context['request']}).data
class ContractGetSerializer(serializers.ModelSerializer):
files = FileModelSerializer(many=True)
is_author = serializers.SerializerMethodField('is_author_method')
contract_signing_status = serializers.SerializerMethodField('get_recipient_signing_status')
def is_author_method(self, foo):
return foo.owner.id == self.context['request'].user.id
class Meta:
model = Contract
fields = ['id', 'is_author', 'title','contract_signing_status','files', ]
如果您愿意，也可以在视图中执行同样的操作，而不是编写新的序列化程序例如：
def list(self, request, *args, **kwargs):
contracts = self.request.user.all_contracts
serializer = ContractGetSerializer(contracts, many=True, context={'request': request}, )
response ={
"recents_count": self.request.user.contracts.filter(your recent condition).count(),
"signed_count": self.request.user.contracts.filter(your recent condition).count(),
"results": serializer.data
}
return Response(response, status=status.HTTP_200_OK)