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如何检查用户是否已登录（如何正确使用user.is_authenticated）？

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问题：如何检查用户是否已登录（如何正确使用user.is_authenticated）？
回答 0
回答 1
回答 2
回答 3
回答 4
回答 5

问题：如何检查用户是否已登录（如何正确使用user.is_authenticated）？

我正在看这个网站，但似乎无法弄清楚该怎么做，因为它不起作用。我需要检查当前站点用户是否已登录（已认证），并且正在尝试：

request.user.is_authenticated

尽管确定用户已登录，但它仅返回：

>

我能够执行其他请求（来自上述网址的第一部分），例如：

request.user.is_active

这将返回成功的响应。

点击查看英文原文

I am looking over this website but just can’t seem to figure out how to do this as it’s not working. I need to check if the current site user is logged in (authenticated), and am trying:

request.user.is_authenticated

despite being sure that the user is logged in, it returns just:

>

I’m able to do other requests (from the first section in the url above), such as:

request.user.is_active

which returns a successful response.

回答 0

Django 1.10+更新：is_authenticated现在是Django 1.10中的属性。为了向后兼容，该方法仍然存在，但在Django 2.0中将被删除。

对于Django 1.9及更早版本：

is_authenticated是一个功能。你应该这样称呼它

if request.user.is_authenticated():
    # do something if the user is authenticated

正如Peter Rowell所指出的那样，可能让您感到困扰的是，在默认的Django模板语言中，您无需附加括号即可调用函数。因此，您可能已经在模板代码中看到了以下内容：

{% if user.is_authenticated %}

但是，在Python代码中，它确实是User类中的方法。

点击查看英文原文

Update for Django 1.10+:

is_authenticated is now an attribute in Django 1.10.

The method was removed in Django 2.0.

For Django 1.9 and older:

is_authenticated is a function. You should call it like

if request.user.is_authenticated():
    # do something if the user is authenticated

As Peter Rowell pointed out, what may be tripping you up is that in the default Django template language, you don’t tack on parenthesis to call functions. So you may have seen something like this in template code:

{% if user.is_authenticated %}

However, in Python code, it is indeed a method in the User class.

回答 1

Django 1.10+

使用属性，而不是方法：

if request.user.is_authenticated: # <-  no parentheses any more!
    # do something if the user is authenticated

Django 2.0中已弃用了同名的方法，并且Django文档中不再提及。

请注意，对于Django 1.10和1.11，该属性的值是a CallableBool而不是布尔值，这可能会导致一些奇怪的错误。例如，我有一个返回JSON的视图

return HttpResponse(json.dumps({
    "is_authenticated": request.user.is_authenticated()
}), content_type='application/json')

在更新到属性request.user.is_authenticated后抛出异常TypeError: Object of type 'CallableBool' is not JSON serializable。解决方案是使用JsonResponse，它可以在序列化时正确处理CallableBool对象：

return JsonResponse({
    "is_authenticated": request.user.is_authenticated
})
点击查看英文原文

Django 1.10+

Use an attribute, not a method:

if request.user.is_authenticated: # <-  no parentheses any more!
    # do something if the user is authenticated

The use of the method of the same name is deprecated in Django 2.0, and is no longer mentioned in the Django documentation.

Note that for Django 1.10 and 1.11, the value of the property is a CallableBool and not a boolean, which can cause some strange bugs. For example, I had a view that returned JSON 
return HttpResponse(json.dumps({
    "is_authenticated": request.user.is_authenticated()
}), content_type='application/json')

that after updated to the property request.user.is_authenticated was throwing the exception TypeError: Object of type 'CallableBool' is not JSON serializable. The solution was to use JsonResponse, which could handle the CallableBool object properly when serializing:

return JsonResponse({
    "is_authenticated": request.user.is_authenticated
})

回答 2

以下块应该工作： 

    {% if user.is_authenticated %}
        <p>Welcome {{ user.username }} !!!</p>       
    {% endif %}
点击查看英文原文

Following block should work: 

    {% if user.is_authenticated %}
        <p>Welcome {{ user.username }} !!!</p>       
    {% endif %}

回答 3

您认为：

{% if user.is_authenticated %}
<p>{{ user }}</p>
{% endif %}

在控制器函数中添加装饰器：

from django.contrib.auth.decorators import login_required
@login_required
def privateFunction(request):
点击查看英文原文

In your view:

{% if user.is_authenticated %}
<p>{{ user }}</p>
{% endif %}

In you controller functions add decorator:

from django.contrib.auth.decorators import login_required
@login_required
def privateFunction(request):

回答 4

如果要在模板中检查经过身份验证的用户，则：

{% if user.is_authenticated %}
    <p>Authenticated user</p>
{% else %}
    <!-- Do something which you want to do with unauthenticated user -->
{% endif %}
点击查看英文原文

If you want to check for authenticated users in your template then:

{% if user.is_authenticated %}
    <p>Authenticated user</p>
{% else %}
    <!-- Do something which you want to do with unauthenticated user -->
{% endif %}

回答 5

对于Django 2.0+版本，请使用：

    if request.auth:
       # Only for authenticated users.

有关更多信息，请访问https://www.django-rest-framework.org/api-guide/requests/#auth

在Django 2.0及更高版本中，request.user.is_authenticated（）已被删除。

点击查看英文原文

For Django 2.0+ versions use:

    if request.auth:
       # Only for authenticated users.

For more info visit https://www.django-rest-framework.org/api-guide/requests/#auth

request.user.is_authenticated() has been removed in Django 2.0+ versions.