Django AttributeError at/accounts/profile/'User'对象在更新配置文件时没有属性'get'

Question

您好，当我尝试添加表单以更新用户配置文件的描述时，出现以下错误

我的模型：

class Profile(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    birth_date = models.DateField(null=True, blank=True)
    profile_img = models.ForeignKey(Image,on_delete=models.CASCADE,related_name='images',null=True)
    description = models.TextField()

我的表格：

class ChangeUserDescription(ModelForm):
    class Meta:
        model = Profile
        fields = ['description','profile_img']
        widgets = {
            'description': forms.Textarea(),
            'profile_img':forms.ImageField()
        }
        labels = {
            'description':'Description',
            'profile_img':'Image'
        }

我的看法是：

@login_required
def profile(request): 
    if request.method == 'POST':
        form = ChangeUserDescription(request.user, request.POST)
        if form.is_valid():
            form.save()
        else:
            messages.error(request, 'Please correct the error below.')
    else:
        form = ChangeUserDescription(request.user)
    return render(request, 'registration/profile.html', {'form': form})

和我的模板：

<div class="mainPage">
    <h1>Profile</h1>
    
    <h2>Bonjour {{user.get_username}}</h2>
    
    <form method="post">
        {% csrf_token %}
        {{ form }}
        <button type="submit">Save changes</button>
    </form>
      
    
    
    <a href="{% url 'adoptYourOcApp:password_change'%}" >Change password</a>


    {% include "annonces/my_list.html" %}
</div>

直接进入相应页面时，我得到以下错误：

AttributeError at /accounts/profile/
'User' object has no attribute 'get'
Request Method: GET
Request URL:    http://localhost:8000/accounts/profile/
Django Version: 2.2.17
Exception Type: AttributeError
Exception Value:    
'User' object has no attribute 'get'

Answer 1

您需要使用Profile的实际实例来实例化ModelForm{}，例如ChangeUserDescription(instance=profile)

some_profile = Profile.objects.get(user=request.user)
form = ChangeUserDescription(instance=some_profile)

和更新时的类似情况：

form = ChangeUserDescription(request.POST, instance=some_profile)

Answer 2

问题可能在于初始化表单的方式。 您可以查看ModelForm-https://docs.djangoproject.com/en/2.2/topics/forms/modelforms/#django.forms.ModelForm的API参考

class ModelForm(BaseModelForm, metaclass=ModelFormMetaclass):
    pass

它没有定义__init__方法，所以我们查看它的父__init__，即BaseModelForm.__init__

class BaseModelForm(BaseForm):
    def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
                 initial=None, error_class=ErrorList, label_suffix=None,
                 empty_permitted=False, instance=None, use_required_attribute=None,
                 renderer=None):

如您所见，它不接受instance作为位置参数，而是作为关键字参数。 init中的第一个参数是data=None，因此表单实例将传递的request.user视为数据字典，从而调用不存在的.get()

将代码修复为

form = ChangeUserDescription(request.POST, instance=request.user)

我们应该解决这个案子

信贷：This SO question