解决Django中‘QuerySet’对象无‘name’属性错误的教程

from django.shortcuts import render, redirect
from django.http import HttpResponseRedirect, Http404
from django.urls import reverse
from django.contrib.auth.decorators import login_required
from .models import Category, AuctionItem # 假设模型在当前应用的models.py中

@login_required
def create_listing(request):
    if request.method == "POST":
        title = request.POST["title"]
        description = request.POST["description"]
        price = request.POST["price"]
        image = request.POST.get("image", "") # 使用.get()处理可选字段，提供默认值
        category_name = request.POST["category"] # 将表单提交的分类名存储在一个新变量中

        # 尝试获取现有分类，如果不存在则创建新分类
        try:
            category_obj = Category.objects.get(name=category_name)
        except Category.DoesNotExist:
            category_obj = Category.objects.create(name=category_name)

        # 创建新的拍卖物品
        item = AuctionItem.objects.create(
            user=request.user,
            title=title,
            description=description,
            price=price,
            image=image,
            category=category_obj # 将获取或创建的Category对象赋值给外键
        )
        return HttpResponseRedirect(reverse("index"))
    return render(request, "auctions/create_listing.html")

from django.shortcuts import render, redirect, get_object_or_404
# ... 其他导入

def some_other_view(request, category_id):
    # 如果 category_id 对应的 Category 不存在，直接返回 404 错误
    category = get_object_or_404(Category, pk=category_id)
    # ... 后续逻辑

from django.shortcuts import render, redirect
from django.http import HttpResponseRedirect
from django.urls import reverse
from django.contrib.auth.decorators import login_required
from .models import Category, AuctionItem # 假设模型在当前应用的models.py中

@login_required
def create_listing(request):
    if request.method == "POST":
        title = request.POST["title"]
        description = request.POST["description"]
        price = request.POST["price"]
        image = request.POST.get("image", "")
        category_name = request.POST["category"]

        # 使用 get_or_create 查找或创建分类
        # category_obj 是 Category 实例，created 是一个布尔值
        category_obj, created = Category.objects.get_or_create(name=category_name)

        # 创建新的拍卖物品
        item = AuctionItem.objects.create(
            user=request.user,
            title=title,
            description=description,
            price=price,
            image=image,
            category=category_obj # 将获取或创建的Category对象赋值给外键
        )
        return HttpResponseRedirect(reverse("index"))
    return render(request, "auctions/create_listing.html")