如何使用Postman表单数据在Django REST Framework中发布嵌套数组？ [英] How to post nested arrays in Django REST Framework with Postman form-data?

问题描述

我有一个带有数组字段的嵌套可写序列化程序。我需要使用表单数据对其进行测试，因为字段类型之一是 ImageField 。当我将 ImageField 更改为 CharField 时，如果我以原始JSON格式发布它，则可以正常工作。

我的简化 serializers.py ：

I have a nested writable serializer with array fields. I need to test it with form-data because one of the field type is ImageField. When I changed the ImageField into CharField it worked fine if I posted it with raw JSON format.
My simplified serializers.py:

class ProductMarketSerializer(serializers.ModelSerializer):
    id = serializers.IntegerField(required=False)
    market = serializers.PrimaryKeyRelatedField(many=False, queryset=Market.objects.all())
    slabs = serializers.PrimaryKeyRelatedField(many=True, queryset=Slab.objects.all())
    thicknesses = serializers.PrimaryKeyRelatedField(many=True, queryset=Thickness.objects.all())
    finish_types = serializers.PrimaryKeyRelatedField(many=True, queryset=FinishType.objects.all())

    class Meta:
        model = ProductMarket
        fields = ['id', 'market', 'name', 'slabs', 'thicknesses', 'finish_types']


class ProductSerializer(serializers.ModelSerializer):
    collection = serializers.PrimaryKeyRelatedField(queryset=ProductCollection.objects.all(), many=False)
    color = serializers.PrimaryKeyRelatedField(queryset=ColorParent.objects.all(), many=False)
    images = ProductImageSerializer(many=True)
    descriptions = ProductDescriptionSerializer(many=True)
    markets = ProductMarketSerializer(many=True)

    class Meta:
        model = Product
        fields = ['id', 'product_code', 'collection', 'color', 'images', 'descriptions', 'markets', 'video', 'status']

    def create(self, validated_data):
        image_data = validated_data.pop('images')
        description_data = validated_data.pop('descriptions')
        market_data = validated_data.pop('markets')

        images = []
        for image in image_data:
            img_obj = ProductImage.objects.create(**image)
            images.append(img_obj)

        descriptions = []
        for description in description_data:
            desc_obj = ProductDescription.objects.create(**description)
            descriptions.append(desc_obj)

        markets = []
        for market in market_data:
            slabs = market.pop('slabs')
            thicknesses = market.pop('thicknesses')
            finish_types = market.pop('finish_types')
            market_obj = ProductMarket.objects.create(**market)
            market_obj.slabs.set(slabs)
            market_obj.thicknesses.set(thicknesses)
            market_obj.finish_types.set(finish_types)
            markets.append(market_obj)

        product = Product.objects.create(**validated_data)
        product.images.set(images)
        product.descriptions.set(descriptions)
        product.markets.set(markets)

        return product

视图。 py ：

class ProductView(viewsets.ModelViewSet):
    permission_classes = [permissions.DjangoModelPermissions]
    serializer_class = ProductSerializer
    queryset = Product.objects.all()

现在我只能发送1个厚板，厚度和 1个 markets 字段中的finish_types 个。如何添加其他平板，厚度和 finish_types 相同的市场？如果我将表单数据用作正文，正确的键值对格式是什么？



创建的产品对象：

For now I can only send 1 slabs, thicknesses, and finish_types each within 1 markets field. How to add another slabs, thicknesses, and finish_types for the same markets? What's the correct key-value pair format if I use form-data as Body?

The created Product object:

{
    "message": "success",
    "data": {
        "id": 60,
        "product_code": "BQ1010",
        "collection": 1,
        "color": 1,
        "images": [
            {
                "id": 57,
                "image": "image",
                "default": false
            }
        ],
        "descriptions": [
            {
                "id": 65,
                "language": 1,
                "description": "new description in english"
            }
        ],
        "markets": [
            {
                "id": 47,
                "market": 1,
                "name": "White Stone",
                "slabs": [
                    1
                ],
                "thicknesses": [
                    2
                ],
                "finish_types": [
                    1
                ]
            }
        ],
        "video": "https://www.youtube.com",
        "status": "Continue"
    }
}

当我尝试添加第二个平板和厚度时，如下所示：


平板和厚度字段将为空。

When I try to add the second slabs and thicknesses like this:
The slabs and thicknesses fields will be empty.

 "markets": [
            {
                "id": 48,
                "market": 1,
                "name": "White Stone",
                "slabs": [],
                "thicknesses": [],
                "finish_types": [
                    1
                ]
            }
        ],

推荐答案

Multiset Python

enter code here

导入数学
导入os
随机导入
导入re
导入系统

import math import os import random import re import sys

类多集：
def init （自我）：
self.item = []

class Multiset: def init(self): self.item=[]

def add(self, val):
    # adds one occurrence of val from the multiset, if any
    return self.item.append(val)
    

def remove(self, val):
    # removes one occurrence of val from the multiset, if any
    if self.item.count(val)!=0:
        return self.item.remove(val)

def __contains__(self, val):
    # returns True when val is in the multiset, else returns False
    if val in self.item:
        return True
    else:
        return False

def __len__(self):
    # returns the number of elements in the multiset
    return len(self.item)

如果 name ==' main '：

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