Django中的外键字段

Question

在不让用户从父模型中选择的情况下保存外键字段的最佳方法是什么？ 假设我有这些模型

型号

class Category(models.Model):
    category_id = models.AutoFiled(primary_key=True)

class Brand(models.Model):
    brand_id = models.AutoFiled(primary_key=True)

class Product(models.Model):
    category = models.ForeignKey(Category)
    brand = models.ForeignKey(Brand)
    name = models.CharField(max_length = 10, blank=True)

表格

Class ProductForm(forms.ModelForm):
    class Meta:
        Model = Product
        fields = ['name']

观看次数

def create_product(request):
    if request.method == "POST":
        form = ProductForm(request.POST or None)
        if form.is_valid():
            form.save()
            messages.success(request, 'Successfully Saved!', 'alert-success')
            return redirect('products')
   else:
        return render(request, ' manageproducts/create_product.html', {'form':form})

我希望用户只输入一个名称，但在数据库中我想要一个表单来发布 category_id、brand_id 和名称。我该怎么做？

Answer 1

您可以尝试 HiddenInput 小部件，它将呈现为 <input type="hidden" ...>。但这需要一些js代码在表单提交之前提供正确的category和brand值

from django import forms

class ProductForm(ModelForm):
    class Meta:
        model = Product
        fields = ('category', 'brand', 'name')
        widgets = {
            'category': forms.HiddenInput(),
            'brand': forms.HiddenInput()
        }

更新

def update_product(request, pk=None):
    try:
        product = Product.ojbects.get(pk=pk)
    except Product.DoesNotExist：
        raise Http404

    form = ProductForm(request.POST or None, instance=product)
    if request.method == "POST":
        if form.is_valid():
            # category and brand will be unchanged
            form.save()
            messages.success(request, 'Successfully Saved!', 'alert-success')
            return redirect('products')
    else:
        return render(request, ' manageproducts/create_product.html', {'form':form})

不选择category和brand只有更新才合理，创建新产品必须选择新的品类和品牌，否则会破坏Foreign Key Constraints p>