Question

我正在尝试将一个查询集解析为一个JSON对象，以便每个键都是模型的主键，每个值都是一个包含所有其他字段的JSON对象。

myjson = {
           apple:  { color: "r", calories: 10},
           banana: { color: "w", calories: 50}
         }

以下是收集数据的模型和Django视图（基于此blog post）：

class Fruit(models.Model):
    fruit_id = models.CharField(primary_key=True)
    color = models.CharField(max_length=50)
    calories = models.IntegerField()

def get_FruitsTableDjango(request):
    fruits_table = Fruit.objects.all().values()
    fruits_table_list = list(fruits_table )  # important: convert the QuerySet to a list object
    return JsonResponse(fruits_table_list , safe=False)

但是在客户端（通过AJAX），这将返回对象数组：

mydata = [
           0: { fruit_id: "apple", color: "r", calories: 10},
           1: { fruit_id: "banana", color: "w", calories: 50}
]

我还here发现了如何按预期对这个数组进行返工：

//Restructure JSON by fruit_id name
fruits= {},
mydata.forEach(function (a) {
    var temp = {};
    Object.keys(a).forEach(function (k) {
        if (k === 'fruit_id') {
            fruits[a[k]] = temp; //gets fruit_id
            return;
        }
        temp[k] = a[k]; //fill the temp variable with elements
    });
});
mydata=fruits; //overwrite initial array with nicely-rearranged-by-fruitId object

我基本上有两个问题：

是否有更直接的方法来获取所需的JSON（由主键嵌套）？
如果没有，则客观上执行对象解析逻辑的最佳位置是：在Javascript的客户端（如上），或在服务器端，例如在Django视图中？

Answer 1

在DRF中，

假设我有如下的model.py

from django.db import models


class OrganisationalUnitGrouper(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name

    @property
    def unit(self):
        return self.organisationalunit_set.all()


class OrganisationalUnit(models.Model):
    unit_id = models.CharField(max_length=255)
    name = models.CharField(max_length=255)
    display = models.CharField(max_length=255)
    description = models.CharField(max_length=255)
    path = models.CharField(max_length=255)
    ou_group = models.ForeignKey(OrganisationalUnitGrouper, on_delete=models.PROTECT)

    def __str__(self):
        return self.name

    class Meta:
        verbose_name_plural = "OU Unit"

序列化器，您可以定义

from rest_framework import serializers

from .models import OrganisationalUnitGrouper, OrganisationalUnit


class OUSerializer(serializers.ModelSerializer):
    # id = serializers.IntegerField(required=False)

    class Meta:
        model = OrganisationalUnit
        fields = ("unit_id", "name", "display", "description", "path")


class OUGroupSerializer(serializers.ModelSerializer):
    unit = OUSerializer(many=True)

    class Meta:
        model = OrganisationalUnitGrouper
        fields = ("name", "unit")

视图集可能是

from rest_framework import viewsets

from .serializers import OUSerializer, OUGroupSerializer
from .models import OrganisationalUnitGrouper, OrganisationalUnit


class OUGroupViewSet(viewsets.ModelViewSet):

    queryset = OrganisationalUnitGrouper.objects.all()
    serializer_class = OUGroupSerializer


class OUViewSet(viewsets.ModelViewSet):

    queryset = OrganisationalUnit.objects.all()
    serializer_class = OUSerializer

这将为您提供嵌套的API。

Django queryset到由主键嵌套的JSON对象

1 个答案: