Django 3：UpdateView 的 get_object_or_404

Question

我有一个问题：我想更新特定数据/产品，但无法使用get_object_or_404views.pyfrom django.shortcuts import render,get_object_or_404from django.http import HttpResponseRedirect, HttpResponsefrom django.urls import reversefrom django.contrib import messagesfrom django.views.generic import (    UpdateView,    DeleteView)from product.models import Productfrom pages.forms import ProductFormdef ProductUpdateView(request, pk):     # queryset = Product.objects.all()[0].pk_id <-- I tried this    # queryset = Product.objects.get() <-- and this    queryset = Product.objects.all()    product1 = get_object_or_404(queryset, pk=pk)    #product1 = get_object_or_404(Product, pk=pk) <-- and this         if request.method == 'POST':        productUpdate_form = ProductForm(data=request.POST,files=request.FILES,instance=request.product1))        # Check to see the form is valid        if productUpdate_form.is_valid(): # and profile_default.is_valid() :            # Sava o produto            productUpdate_form.save()            # Registration Successful! messages.success            messages.success(request, 'Produto Modificado com Sucesso')            #Go to Index            return HttpResponseRedirect(reverse('index'))        else:            # One of the forms was invalid if this else gets called.            print(productUpdate_form.errors)    else:        # render the forms with data.        productUpdate_form = ProductForm(instance=request.product1)            context = {'productUpdate_form': productUpdate_form,}    return render(request, 'base/update.html',context)urls.pyfrom django.urls import include, pathfrom pages.views import (ProductListView,                        ProductUpdateView,                        ProductDeleteView)服务器时间：2020年10月1日星期四21:36:44 -0300。因此，我无法比较get_object_or_404中的pk，我需要它来找到并使用特定的数据/产品。还有什么其他方法可以使用get_object_or_404或比较 link/pk 和 data/product ？请帮助。

Answer 1

问题出在：

productUpdate_form = ProductForm(instance=request.product1)

不request包含product1属性，您只需传递product1对象即可：

from django.shortcuts import render, get_object_or_404, redirect

from django.http import HttpResponseRedirect, HttpResponse

from django.contrib import messages

from django.views.generic import (

    UpdateView,

    DeleteView

)

from product.models import Product

from pages.forms import ProductForm

def ProductUpdateView(request, pk): 

    product1 = get_object_or_404(Product, pk=pk)

     

    if request.method == 'POST':

        productUpdate_form = ProductForm(data=request.POST,files=request.FILES,instance=product1))

        # Check to see the form is valid

        if productUpdate_form.is_valid(): # and profile_default.is_valid() :

            # Sava o produto

            productUpdate_form.save()

            # Registration Successful! messages.success

            messages.success(request, 'Produto Modificado com Sucesso')

            #Go to Index

            return redirect('index')

        else:

            # One of the forms was invalid if this else gets called.

            print(productUpdate_form.errors)

    else:

        # render the forms with data.

        productUpdate_form = ProductForm(instance=product1)

    

    

    context = {'productUpdate_form': productUpdate_form,}

    return render(request, 'base/update.html',context)

然而，这不是一个UpdateView：这不是一个基于类的视图，并且它不是从UpdateView.

注意：函数通常用Snake_case编写，而不是PerlCase，因此建议将函数重命名为product_update_view, not ProductUpdateView。

Answer 2

最好使用 ClassView

# views.py

from django.views.generic.edit import UpdateView

from product.models import Product

from django.contrib import messages

from pages.forms import ProductForm

class ProductUpdateView(UpdateView):

    model = Product

    form_class = ProductForm

    template_name = 'base/update.html'

    def form_valid(self, form):

        self.object = form.save()

        messages.success(self.request, 'Produto Modificado com Sucesso')

        return redirect('index')

 

    def get_context_data(self, **kwargs):

        if 'productUpdate_form' not in kwargs:

            kwargs['productUpdate_form'] = self.get_form()

        return super().get_context_data(**kwargs)

         

# urls.py

from django.urls import include, path

from pages.views import (ProductListView,

                        ProductUpdateView,

                        ProductDeleteView)

urlpatterns = [

    path('listProduct/', ProductListView, name='listProduct'),

    path('<int:pk>/update/', ProductUpdateView.as_view(), name='product-update'),

]