Django Admin：如何访问 admin.py 中的 request 对象，用于 list_display 方法？

Question

我在模型的 admin.py 类中添加了一个方法 highlight_link：

class RadioGridAdmin(admin.ModelAdmin):
    
    list_display = ('start_time', highlight_link)
    
    def highlight_link(self):
        return ('some custom link')
    
    
admin.site.register(RadioGrid, RadioGridAdmin)

它返回一个自定义链接（为了简洁起见，我省略了 highlight_link.short_description）返回的每条记录在更改列表中。 这太棒了。 但我想检查当前的查询字符串并根据该字符串更改自定义链接。 有没有办法访问 highlight_link 中的请求对象？

Answer 1

我用这种方式解决了我的问题（对于 1.7 以下的 django）：

class MyClassAdmin(admin.ModelAdmin):

    def queryset(self, request):
        qs = super(MyClassAdmin, self).queryset(request)
        self.request = request
        return qs

现在我可以在任何地方使用 self.request

UPDATE

在 Django 1.6 中更改:
get_queryset 方法以前名为 queryset。

class MyClassAdmin(admin.ModelAdmin):

    def get_queryset(self, request):
        qs = super(MyClassAdmin, self).get_queryset(request)
        self.request = request
        return qs

Answer 2

class RadioGridAdmin(admin.ModelAdmin):

    def highlight_link(self, obj):
        return (self.param)

   def changelist_view(self, request, extra_context=None):
        self.param = request.GET['param']
        return super(RadioGridAdmin,self).changelist_view(request, extra_context=extra_context)

Answer 3

描述了如何将其重构为 mixin ，并根据 @taha-jahangir 的答案添加了线程安全位。 这是 mixin:

import threading

class ModelAdminRequestMixin(object):
    def __init__(self, *args, **kwargs):
        # let's define this so there's no chance of AttributeErrors
        self._request_local = threading.local()
        self._request_local.request = None
        super(ModelAdminRequestMixin, self).__init__(*args, **kwargs)

    def get_request(self):
        return self._request_local.request

    def set_request(self, request):
        self._request_local.request = request

    def changeform_view(self, request, *args, **kwargs):
        # stash the request
        self.set_request(request)

        # call the parent view method with all the original args
        return super(ModelAdminRequestMixin, self).changeform_view(request, *args, **kwargs)

    def add_view(self, request, *args, **kwargs):
        self.set_request(request)
        return super(ModelAdminRequestMixin, self).add_view(request, *args, **kwargs)

    def change_view(self, request, *args, **kwargs):
        self.set_request(request)
        return super(ModelAdminRequestMixin, self).change_view(request, *args, **kwargs)

    def changelist_view(self, request, *args, **kwargs):
        self.set_request(request)
        return super(ModelAdminRequestMixin, self).changelist_view(request, *args, **kwargs)

    def delete_view(self, request, *args, **kwargs):
        self.set_request(request)
        return super(ModelAdminRequestMixin, self).delete_view(request, *args, **kwargs)

    def history_view(self, request, *args, **kwargs):
        self.set_request(request)
        return super(ModelAdminRequestMixin, self).history_view(request, *args, **kwargs)

Subclass ModelAdmin with the mixin:

class PollAdmin(ModelAdminRequestMixin, admin.ModelAdmin):
    pass

... 并且您可以从任何方法调用 self.get_request() 。

Answer 4

小代码澄清了Diego Puente答案（python 3.6）：

class MyClassAdmin(admin.ModelAdmin):
    def __init__(self, model, admin_site): 
        self.request = None
        super().__init__(model, admin_site)

    def get_queryset(self, request):
        self.request = request      
        return super().get_queryset(request)

因此您可以从MyClassAdmin的任何其他方法获取self.request。

如果在 get_queryset 方法中定义 self.request（未在 __init__ 中声明），PyCharm 将生成警告 Instance attribute attribute_name在 __init__ 之外定义< /代码>。

Answer 5

没有直接的方法可以实现这一点。 我看到两种可能的解决方案。

• 使用线程局部变量存储到同一请求对象

  从 django.utils._threading_local 导入局部变量 
  
    全局变量=局部变量() 
  
    RadioGridAdmin 类（admin.ModelAdmin）： 
      def __call__(自身，请求，*args，**kwargs)： 
          全局['radio_grid_admin_request'] = 请求 
          返回 super(RadioGridAdmin, self).__call__(request, *args, **kwargs) 
  
      def 高亮链接（自身）： 
          请求=全局['radio_grid_admin_request'] 
          # request.GET处理 
          return ('一些自定义链接') 
    

• 如果您使用简单的非线程 Django 安装，则可以将请求对象保存为属性：

  类 RadioGridAdmin(admin.ModelAdmin): 
      def __call__(自身，请求，*args，**kwargs)： 
          自我请求=请求 
          返回 super(RadioGridAdmin, self).__call__(request, *args, **kwargs) 
  
      def 高亮链接（自身）： 
          # self.request.GET处理 
          return ('一些自定义链接') 
    

Answer 6

这是 @user27478 答案的编辑版本，它使用线程本地变量：

class RadioGridAdmin(admin.ModelAdmin):
    def __init__(self, model, admin_site):
        super().__init__(model, admin_site)
        self._request_local = threading.local()

    def changelist_view(self, request, extra_context=None):
        self._request_local.request = request
        return super().changelist_view(request, extra_context)

    @property
    def _request(self):
        return self._request_local.request

    def example_highlight_link(self, obj):
        changelist = self.get_changelist_instance(self._request)
        url = changelist.get_query_string(new_params={'key1': 1})

Answer 7

我尝试了这里留下的其他答案，但遇到了对我来说变得越来越复杂的问题。 我尝试了一下 def __call__() 并得出了以下结论。 这可能不是执行此操作的正确方法，但它有效...

在此处获取 GET 变量（全部在 RadioGridAdmin 类中，如我最初的文章中所述）：

def __call__(self, request, url):
     global start_date
     start_date = request.GET['param']

     return super(RadioGridAdmin, self).__call__(request, url)

并且由于它是全局的，因此您现在可以在此处访问它：

def highlight_link(self):
    # access start_date here

Answer 8

import threading

_thread_local = threading.local()

def get_thread_local_request():
    return getattr(_thread_local, "request", None)

class RadioGridAdmin(admin.ModelAdmin):
    list_display = ('display_field', ...)

    def display_field(self, obj):
        # ...
        request = get_thread_local_request()
        # ... 

Answer 9

admin_mixins.py

from functools import partial, update_wrapper, lru_cache

# Django admin call 2 times get_list_display.
# We need to return the same function to make the method sortable using 'admin_order_field'
# https://github.com/django/django/blob/2161db0792f2e4d3deef3e09cd72f7a08340cafe/django/contrib/admin/templatetags/admin_list.py#L84
@lru_cache(maxsize=100)
def cache_display_wrap(f, request):
    wf = partial(f, request)
    nf = update_wrapper(wf, f)
    return nf

  
class ModelAdminMixin(admin.ModelAdmin):
  
    def get_list_display(self, request):
        def check_needs_request(display):
            f = getattr(self, display, None) if not callable(display) else display 
            if f and getattr(f, 'needs_request', False):
              return cache_display_wrap(f, request)
            return display
        return [check_needs_request(display) for display in super().get_list_display(request)]

any_app/admin.py

from django.contrib import admin
from core.admin_mixins import ModelAdminMixin


@admin.register(AnyModel)
class AnyModelAdmin(ModelAdminMixin, admin.ModelAdminMixin):

    list_display = ['id', 'especial_display_with_request']

    def especial_display_with_request(self, request, obj):
        # Make something special with the request
        return obj.any_field
    especial_display_with_request.needs_request = True  # Similar to short_description or any other django admin attr.

来源： https://gist.github.com/pricco/24826bae3d5102d963eb13ecc0493f33< /a>

Answer 10

这是什么问题：

def highlight_link(self, request):
    # access start_date here