一、环境配置
操作系统:WIndows 64
django版本:3.0.3
数据库:mysql
二、报错代码
c = Category() c.name = cleaned_data.get("name") c.brief = cleaned_data.get("brief") c.author.add(User.objects.get(username=username)) c.save()
ValueError: "<Category: C++>" needs to have a value for field "id" before this many-to-many relationship can be used.
三、解决方法
c = Category() c.name = cleaned_data.get("name") c.brief = cleaned_data.get("brief") c.save() c.author.add(User.objects.get(username=username)) c.save()