Django 在中间模型中保存大量字段数据的问题
首先,对不起我的英语 我有这样的结构,想法是: 产品可以有很多供应商,供应商自己也有产品Django 在中间模型中保存大量字段数据的问题,django,many-to-many,relationship,django-orm,Django,Many To Many,Relationship,Django Orm,首先,对不起我的英语 我有这样的结构,想法是: 产品可以有很多供应商,供应商自己也有产品 class Supplier(Model): title = CharField() def add_product(self, **kwargs): s2p = Stock(supplier=self, **kwargs) s2p.save() class Product(Model): title = CharField()
class Supplier(Model):
title = CharField()
def add_product(self, **kwargs):
s2p = Stock(supplier=self, **kwargs)
s2p.save()
class Product(Model):
title = CharField()
stock = ManyToManyField(Supplier, through="Stock")
class Stock(Model):
in_stock = BooleanField()
product = ForeignKey(Product, related_name="product_stock")
supplier = ForeignKey(Supplier, related_name="supplier_stock")
# forms.py
class ProductForm(ModelForm):
class Meta:
model = Product
stock = ModelChoiceField(queryset=Supplier.objects.all(), widget=CheckboxSelectMultiple)
# views.py
def product_edit(request, product_id, template):
if product_id:
product = get_object_or_404(Product, pk=product_id)
else:
product = Product()
if request.method == "POST":
data = request.POST.copy()
form = ProductForm(data, request.FILES, instance=product)
if form.is_valid():
prod = form.save(commit=False)
if product.id:
prod.editedby = product.editedby
else:
prod.createdby = request.user
prod.editedby = request.user
prod.save()
if "stock" in request.POST:
actions.clear_stock()
suppliers = data.get('stock','')
for supplier in suppliers:
supp = Supplier.objects.get(pk=supplier)
supp.add_product(product=prod)
else:
form = ProductForm(instance=product)
dict = {
'form': form,
}
return render_to_response(template, dict, context_instance=RequestContext(request))
# actions.py
def clear_stock():
s2ps = Stock.objects.all()
for s2p in s2ps:
s2p.delete()
当我添加产品时,它必须与供应商相关,我使用这种类型的逻辑:
希望我解释了问题。您想更改此设置:
data.get('stock','')
为此:
data.getlist('stock')
QueryDict.get('foo')
只为foo
返回一个值,即使foo
有多个值。请参阅。要更改此设置,请执行以下操作:
data.get('stock','')
为此:
data.getlist('stock')
QueryDict.get('foo')
只为foo
返回一个值,即使foo
有多个值。请参阅。另一种解决方案是将表单字段更改为ModelMultipleChiceField。然后您将能够迭代form.cleaned_数据['stock'],它将为您提供所选供应商的实际实例。这避免了直接处理POST QueryDict,也消除了“手动”进行供应商查询的需要。另一种解决方案是将表单字段更改为ModelMultipleChiceField。然后您将能够迭代form.cleaned_数据['stock'],它将为您提供所选供应商的实际实例。这避免了直接处理后查询信息,也消除了“手动”进行供应商查询的需要。OMG!这是可行的,没想到会这么容易!谢谢:)顺便说一句,我试图使用数据['stock'],但我也没有返回list.OMG!这是可行的,没想到会这么容易!谢谢:)顺便说一句,我试图使用数据['stock',],但我也没有返回列表。