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

问题描述 投票：0回答：10

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)

它为更改列表中返回的每条记录返回一个自定义链接（为了简洁起见，我省略了 

highlight_link.short_description
）。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。有没有办法在
highlight_link
内访问请求对象？

django django-admin request
10个回答
34
投票

我用这种方式解决我的问题（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

更新

Django 1.6 中的更改： 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
20
投票
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)
6
投票

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。这是混合：

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)

使用 mixin 对 ModelAdmin 进行子类化：

class PollAdmin(ModelAdminRequestMixin, admin.ModelAdmin):
    pass

...您可以从任何方法调用 

self.get_request()
。

4
投票

小代码澄清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 

self.request
的任何其他方法获得 
MyClassAdmin
。

如果在 

self.request
方法中定义 
get_queryset
（未在 
__init__
中声明）PyCharm 将生成警告 
Instance attribute attribute_name defined outside __init__
。

3
投票

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。

  • 使用线程本地存储到同一请求对象

    from django.utils._threading_local import locals

globals = locals()

class RadioGridAdmin(admin.ModelAdmin):
  def __call__(self, request, *args, **kwargs):
      globals['radio_grid_admin_request'] = request
      return super(RadioGridAdmin, self).__call__(request, *args, **kwargs)

  def highlight_link(self):
      request = globals['radio_grid_admin_request']
      # request.GET processing
      return ('some custom link')

  • 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：

    class RadioGridAdmin(admin.ModelAdmin):
  def __call__(self, request, *args, **kwargs):
      self.request = request
      return super(RadioGridAdmin, self).__call__(request, *args, **kwargs)

  def highlight_link(self):
      # self.request.GET processing
      return ('some custom link')
3
投票

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})
0
投票

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 

def __call__()
并想出了以下内容。这可能不是正确的方法，但它有效......

在此处获取 GET 变量（所有内容都在 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)

由于它是全球性的，您现在可以在这里访问它：

def highlight_link(self):
    # access start_date here
0
投票
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()
        # ...
0
投票

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

-2
投票

这有什么问题：

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