Python 如何在同一api内的django rest框架中获得聚合
这是我的模特Python 如何在同一api内的django rest框架中获得聚合,python,django,Python,Django,这是我的模特 from __future__ import unicode_literals from django.db import models class User(models.Model): name = models.CharField(max_length=200) company_name = models.ForeignKey('Company',on_delete=models.CASCADE,related_name='user') def _
from __future__ import unicode_literals
from django.db import models
class User(models.Model):
name = models.CharField(max_length=200)
company_name = models.ForeignKey('Company',on_delete=models.CASCADE,related_name='user')
def __str__(self):
return self.name
class Company(models.Model):
name = models.CharField(max_length=200)
phone_number = models.IntegerField(null=True,blank=True)
def __str__(self):
return self.name
class Catalog(models.Model):
name = models.CharField(max_length=200)
no_of_pcs = models.IntegerField(null=True,blank=True)
per_piece_price = models.DecimalField(null=True,blank=True,max_digits=10,decimal_places=2)
company_name = models.ForeignKey(Company,on_delete=models.CASCADE,related_name='catalog')
def __str__(self):
return self.name
这是我的serializers.py
from rest_framework import serializers
from .models import *
from django.db.models import Sum,Avg,Max,Min,Count,F,Q
class CatalogSerializer(serializers.HyperlinkedModelSerializer):
dynamic_data = serializers.SerializerMethodField()
class Meta:
model = Catalog
fields = '__all__'
def get_dynamic_data(self, obj):
totalpieces = Catalog.objects.all().aggregate(total_pieces=Count('no_of_pcs'))
totalprice = Catalog.objects.all().aggregate(total_price=Sum('per_piece_price'))
print(totalpieces["total_pieces"],totalprice["total_price"])
return totalpieces["total_pieces"],totalprice["total_price"]
class UserSerializer(serializers.ModelSerializer):
# name = serializers.StringRelatedField()
company_name = serializers.CharField()
class Meta:
model = User
fields = '__all__'
class CatalogData(serializers.ModelSerializer):
class Meta:
model = Catalog
fields = ('name', 'no_of_pcs', 'per_piece_price')
class CompanySerializer(serializers.ModelSerializer):
# catalog_details = serializers.SerializerMethodField()
# name = serializers.StringRelatedField()
catalog = CatalogData(many=True)
user = UserSerializer(many=True)
class Meta:
model = Company
fields = ('name', 'phone_number', 'catalog','user')
这是我的观点
from __future__ import unicode_literals
from django.http import HttpResponse
from .models import *
import json
from django.http import JsonResponse, HttpResponse
from .serializers import *
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from rest_framework import viewsets
class CatalogView(viewsets.ModelViewSet):
queryset = Catalog.objects.select_related('company_name')
serializer_class = CatalogSerializer
class CompanyView(viewsets.ModelViewSet):
queryset = Company.objects.all()
serializer_class = CompanySerializer
class UserView(viewsets.ModelViewSet):
queryset = User.objects.all()
serializer_class = UserSerializer
我得到的api是这样的
[
{
"url": "http://127.0.0.1:8000/catalogs/1/",
"dynamic_data": [
3,
471118.0
],
"name": "sarees",
"no_of_pcs": 23,
"per_piece_price": "33333.00",
"company_name": "http://127.0.0.1:8000/companies/1/"
}
]
这里的动态数据3是总件数,表示总计数
在动态数据中,471118.0是总价格,即总金额
但我希望api采用不同的格式
像这样:
[
{
"url": "http://127.0.0.1:8000/catalogs/1/",
"total_pieces":3,
"total_price": 471118.0
"name": "sarees",
"no_of_pcs": 23,
"per_piece_price": "33333.00",
"company_name": "http://127.0.0.1:8000/companies/1/"
}
]
我想在同一个api中获得总件数和总价格
谢谢,,在一个函数中,您将返回两个值,因此django不会将其分开,并将其作为列表传递,如果您想要不同的键值对,请使用此选项
class CatalogSerializer(serializers.HyperlinkedModelSerializer):
total_pieces = serializers.SerializerMethodField()
total_price = serializers.SerializerMethodField()
class Meta:
model = Catalog
fields = '__all__'
def get_total_pieces(self, obj):
totalpieces = Catalog.objects.all().aggregate(total_pieces=Count('no_of_pcs'))
return totalpieces["total_pieces"]
def get_total_price(self, obj):
totalprice = Catalog.objects.all().aggregate(total_price=Sum('per_piece_price'))
return totalprice["total_price"]