擅长:python、mysql、java
<p>在model<strong>列表中,category</em>是一个is外键,正如错误提示的那样,您应该存储<strong>category</strong>的实例</p>
<p>试试这个:</p>
<pre><code>category = Category.object.filter(id = form.cleaned_data["category"]).first()
item = Listing(owner=owner, title=title, description=description, link=link, startingBid=startingBid, category=category)
</code></pre>