django PermissionRequiredMixin permission_required 不起作用

Question

Views.py

class templateList(PermissionRequiredMixin, TemplateView):
    permission_required = 'accounts.template_all'

    def get(self, request, *args, **kwargs):
        #view logic
        print(self.request.user.has_perms('accounts.template_all'))
        return render(request, template_name, context)

accounts/models.py

class User(AbstractBaseUser, PermissionsMixin):
    # some fields here
    class Meta:
        verbose_name = _('user')
        verbose_name_plural = _('users')

        permissions = (
            ("template_all", "access to all templates"),
        )

视图名称.___mro____

(<class 'template.views.templateList'>, <class 'django.contrib.auth.mixins.PermissionRequiredMixin'>, <class 'django.contrib.auth.mixins.AccessMixin'>, <class 'django.views.generic.base.TemplateView'>, <class 'django.views.generic.base.TemplateResponseMixin'>, <class 'django.views.generic.base.ContextMixin'>, <class 'django.views.generic.base.View'>, <class 'object'>)

views.py 中的self.request.user.has_perms('accounts.template_all') 返回正确的布尔值，但是，self.has_permission() 每次都返回 True。 permission_required 没有效果，即使打印返回 false 用户仍然可以看到页面。 self.get_permission_required alos 返回正确的值。帮助表示赞赏。

Answer 1

简而言之：PermissionRequiredMixin 基类应放置在TemplateView 基类之前，这样 MRO（方法解析顺序）是正确的，并且调度点覆盖PermissionRequiredMixin。

PermissionRequiredMixin 修补了dispatch(..) 方法（它添加了一个额外的检查来查看用户是否具有适当的权限）。然而，在这里，您将子类按顺序放置，从而导致dispatch(..) 函数是来自View 类的函数。

确实，如果我们看一下 MRO，我们会看到：

>>> ViewName.__mro__
(<class 'ViewName'>, <class 'django.views.generic.base.TemplateView'>, <class 'django.views.generic.base.TemplateResponseMixin'>, <class 'django.views.generic.base.ContextMixin'>, <class 'django.views.generic.base.View'>, <class 'django.contrib.auth.mixins.PermissionRequiredMixin'>, <class 'django.contrib.auth.mixins.AccessMixin'>, <class 'object'>)

如果我们查看调用.dispatch(..) 时调用的方法，我们会看到：

>>> ViewName.dispatch
<function View.dispatch at 0x7f169e8f6620>

为了让mixin覆盖原来的.dispatch(..)函数，我们需要把它放在基类的首位，比如：

# PermissionRequiredMixin is put before TemplateView

class ViewName(PermissionRequiredMixin, TemplateView):
    permission_required = 'accounts.action_all'
    # ...

然后我们看到：

>>> ViewName.__mro__
(<class 'ViewName'>, <class 'django.contrib.auth.mixins.PermissionRequiredMixin'>, <class 'django.contrib.auth.mixins.AccessMixin'>, <class 'django.views.generic.base.TemplateView'>, <class 'django.views.generic.base.TemplateResponseMixin'>, <class 'django.views.generic.base.ContextMixin'>, <class 'django.views.generic.base.View'>, <class 'object'>)
>>> ViewName.dispatch
<function PermissionRequiredMixin.dispatch at 0x7f168b41d620>