# Django Crispy Forms TypeError: __init__() got an unexpected keyword argument 'instance'

## 环境 Python3.6 + django2.2

# 错误原因是要使用instance参数 UserChangeInfoForm继承forms.ModelForm 而不是forms.Form

## 原代码

```
class UserChangeInfoForm(forms.Form):
    class Meta:
        model = UserProfile
        fields = ['nick_name', 'sex', 'address', 'phone', 'brithday']
```

```
def user_change_info(request):
    user_change_info_form = UserChangeInfoForm(request.POST, instance=request.user)
    if user_change_info_form.is_valid():
        user_change_info_form.save(commit=True)
        return JsonResponse({"status": 'ok', 'msg': '修改成功'})
    else:
        return JsonResponse({"status": 'fail', 'msg': '修改失败'})
```

## 修改之后

```
class UserChangeInfoForm(forms.ModelForm):
    class Meta:
        model = UserProfile
        fields = ['nick_name', 'sex', 'address', 'phone', 'brithday']
```

```
def user_change_info(request):
    user_change_info_form = UserChangeInfoForm(request.POST, instance=request.user)
    if user_change_info_form.is_valid():
        user_change_info_form.save(commit=True)
        return JsonResponse({"status": 'ok', 'msg': '修改成功'})
    else:
        return JsonResponse({"status": 'fail', 'msg': '修改失败'})
```

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