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我试图使一个电子商务网站，但它不会让我创建的上市，并张贴在这里views.py

from django.contrib.auth import authenticate, login, logout
from django.db import IntegrityError
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import render
from django.urls import reverse

from .models import User, Category, Listing

def index(request):
    activeListings = Listing.objects.filter(isActive=True)
    allCategories = Category.objects.all()
    return render(request, "auctions/index.html",{
        "listings": activeListings,
        "categories": allCategories
    })

def displayCategory(request):
    if request.method == "POST":
        categoryFromForm = request.POST['category']
        category = category.objects.get(categoryName=categoryFromForm)
        activeListings = Listing.objects.filter(isActive=True, category=category)
        allCategories = Category.objects.all()
        return render(request, "auctions/index.html",{
            "listings": activeListings,
            "categories": allCategories
        })

def createListing(request):
    if request.method=="GET":
        allCategories = Category.objects.all()
        return render(request, "auctions/create.html", {
            "categories": allCategories
        })
    else:
        title = request.POST.get("title")
        description = request.POST.get("description")
        imageurl = request.POST.get("imageurl")
        price = request.POST.get("price")
        category = request.POST.get("category")
        currentUser = request.user
        categoryData=Category.objects.get(categoryName=category)
        newListing = Listing(
            title = title,
            description = description,
            imageUrl = imageurl,
            price = str(price),
            category = categoryData,
            owner = currentUser
        )
        newListing.save()
        return HttpResponseRedirect(index)

def login_view(request):
    if request.method == "POST":

        # Attempt to sign user in
        username = request.POST["username"]
        password = request.POST["password"]
        user = authenticate(request, username=username, password=password)

        # Check if authentication successful
        if user is not None:
            login(request, user)
            return HttpResponseRedirect(reverse("index"))
        else:
            return render(request, "auctions/login.html", {
                "message": "Invalid username and/or password."
            })
    else:
        return render(request, "auctions/login.html")

def logout_view(request):
    logout(request)
    return HttpResponseRedirect(reverse("index"))

def register(request):
    if request.method == "POST":
        username = request.POST["username"]
        email = request.POST["email"]

        # Ensure password matches confirmation
        password = request.POST["password"]
        confirmation = request.POST["confirmation"]
        if password != confirmation:
            return render(request, "auctions/register.html", {
                "message": "Passwords must match."
            })

        # Attempt to create new user
        try:
            user = User.objects.create_user(username, email, password)
            user.save()
        except IntegrityError:
            return render(request, "auctions/register.html", {
                "message": "Username already taken."
            })
        login(request, user)
        return HttpResponseRedirect(reverse("index"))
    else:
        return render(request, "auctions/register.html")

网址：models.py

from django.db import models

class User(AbstractUser):
    pass

class Category(models.Model):
    categoryName = models.CharField(max_length=50)

    def __str__(self):
        return self.categoryName

class Listing(models.Model):
    title = models.CharField(max_length=30)
    imageUrl = models.CharField(max_length=300)
    price = models.FloatField(max_length=1000)
    isActive = models.BooleanField(default=True)
    owner = models.ForeignKey(User, on_delete=models.CASCADE, blank=True, null=True, related_name="user")
    category = models.ForeignKey(Category, on_delete=models.CASCADE, blank=True, null=True, related_name="category")

def __str__(self):
    return self.title

hereindex.html

{% extends "auctions/layout.html" %}

{% block body %}
    <h2>Active Listings</h2>
    <form action="{% url 'displayCategory' %}" method="POST">
        {% csrf_token %}
        <label for="category">Choose a category:</label>
        <select name="category" id="category">
            {% for cat in categories %}
                <option value="{{ cat }}">{{ cat }}</option>
            {% endfor %}
        </select>
        <button type="submit" class="btn btn-success">Select</button>
    </form>

    <div class="row mx-3">
        {% for listing in listings %}
                <div class="card" style="width: 18rem;">
                    <img class="card-img-top" src="{{ listing.imageUrl }}" alt="{{ listing.title }}">
                    <div class="card-body">
                        <h5 class="card-title">{{ listing.title }}</h5>
                        <p class="card-text">{{ listing.description }}</p>
                        <a href="" class="btn btn-primary"></a>
                    </div>
                </div>
        {% endfor %}
    </div>
{% endblock %}

这里是create.html

{% extends "auctions/layout.html" %}

{% block body %}
    <h2>Create Listing</h2>
    <form action="{% url 'create' %}" method="POST">
        {% csrf_token %}
        <div class="form-group">
            <label for="title">Title</label>
            <input type="text" class="form-control" id="title" placeholder="Enter Title:">
        </div>
        <div class="form-group">
            <label for="Description">Description</label>
            <input type="text" class="form-control" id="description" placeholder="Enter description:">
        </div>
        <div class="form-group">
            <label for="imageurl">Image</label>
            <input type="text" class="form-control" id="imageurl" placeholder="Enter image url:">
        </div>
        <div class="form-group">
            <label for="price">Price</label>
            <input type="text" class="form-control" id="price" placeholder="Enter Price">
        </div>
        <div class="form-group">
            <label for="category">Choose a category:</label>
            <select name="category" id="category">
                {% for cat in categories %}
                    <option value="{{ cat }}">{{ cat }}</option>
                {% endfor %}
            </select>
        </div>
        <button type="submit" class="btn btn-success">Add listing</button>
    </form>
{% endblock %}

我不知道该怎么办，但问题就在这里

title = request.POST.get("title")
        description = request.POST.get("description")
        imageurl = request.POST.get("imageurl")
        price = request.POST.get("price")
        category = request.POST.get("category")
        currentUser = request.user
        categoryData=Category.objects.get(categoryName=category)
        newListing = Listing(
                          …
            title = title,
            description = description,
            imageUrl = imageurl,
            price = str(price),
            category = categoryData,
            owner = currentUser

我不知道发生了什么事，请帮助它的一个cs50W项目称为商业，如果你们中的任何人做了。