我有兩個模型，看起來像這樣：
class Item(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField(max_length=60)
sku = models.CharField(max_length=60)
description = models.TextField()
price = models.DecimalField(max_digits=6, decimal_places=2)
location = models.CharField(max_length=60)
serial_number = models.CharField(max_length=60)
def __str__(self):
return self.name
class Warehouse(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField(max_length=60)
def __str__(self):
return self.name
他們有兩個如下所示的序列化程式：
class ItemSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = Item
fields = ('id', 'name', 'sku', 'description', 'price', 'location', 'serial_number')
#we need a validator that checks if location is in the list of warehouses
#we need a validator that checks if sku is in the list of products
class WarehouseSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = Warehouse
fields = ('id', 'name')
我需要一種方法來確保新創建的專案的位置欄位與倉庫中現有的名稱欄位匹配。我還需要洗掉一個倉庫來觸發該倉庫中所有專案的洗掉，或者，如果失敗了；如果倉庫有物品，則不能洗掉。
我是 python 和 django 的新手，所以任何幫助都將不勝感激！
作為參考，我的視圖類看起來像
class ItemViewSet(viewsets.ModelViewSet):
queryset = Item.objects.all().order_by('name')
serializer_class = ItemSerializer
class WarehouseViewSet(viewsets.ModelViewSet):
queryset = Warehouse.objects.all().order_by('name')
serializer_class = WarehouseSerializer
如果這有幫助，但據我所知，我不希望它。提前致謝！
uj5u.com熱心網友回復：
我認為這里的問題是您的資料模型。很明顯，倉庫和物品具有一對多的關系。這樣，您的模型中就會有類似的東西。
from django.db import models
class Warehouse(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField(max_length=60)
def __str__(self):
return self.name
class Item(models.Model):
id = models.AutoField(primary_key=True)
warehouse = models.ForeignKey(Warehouse, related_name="items", on_delete=models.CASCADE)
name = models.CharField(max_length=60)
sku = models.CharField(max_length=60)
description = models.TextField()
price = models.DecimalField(max_digits=6, decimal_places=2)
location = models.CharField(max_length=60)
serial_number = models.CharField(max_length=60)
def __str__(self):
return self.name
這on_delete=models.CASCADE將確保在洗掉倉庫時洗掉與倉庫相關的所有專案。外鍵關系將確保id您在創建專案時提供的倉庫在創建專案之前存在。
其他檔案如下所示。
序列化程式.py
from rest_framework import serializers
from .models import Warehouse, Item
class ItemSerializer(serializers.ModelSerializer):
class Meta:
model = Item
fields = ('id', 'name', 'sku', 'description', 'price', 'location', 'serial_number', "warehouse")
class WarehouseSerializer(serializers.HyperlinkedModelSerializer):
items = serializers.StringRelatedField(many=True, required=False)
class Meta:
model = Warehouse
fields = ('id', 'name', 'items')
視圖.py
from .models import Item, Warehouse
from .serializers import ItemSerializer, WarehouseSerializer
from rest_framework import viewsets
class ItemViewSet(viewsets.ModelViewSet):
queryset = Item.objects.all().order_by('name')
serializer_class = ItemSerializer
class WarehouseViewSet(viewsets.ModelViewSet):
queryset = Warehouse.objects.all().order_by('name')
serializer_class = WarehouseSerializer
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