Django学习过程中的排错总结

报错一：
RuntimeError: You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data. Change your form to point to 127.0.0.1:8090/add_user/ (note the trailing slash), or set APPEND_SLASH=False in your Django settings.

解决办法：
1.确保你的add_user.html中form表单的action是否以/结尾
<form action="/add_user/" method="post" novalidate>

2.修改settings.py，添加以下内容
APPEND_SLASH=False

报错二：
编辑好数据提交时，POST请求后,表单里action="/edit_user-{{ nid }}/"中的nid没拿到
后端报错：Not Found: /edit_user-/

原因：先前GET请求edit_user.html页面时，函数没有返回nid，所以post的时候nid拿不到
def edit_user(request,nid):
    if request.method == "GET":
        data = models.UserInfo.objects.filter(id=nid).first()
        obj = UserForm({'username':data.username,'email':data.email})
        return render(request,'edit_user.html',{'obj':obj,'nid':nid})