[Django]-Django Admin: How to access the request object in admin.py, for list_display methods?

I solve my issue this way (for django under 1.7):

class MyClassAdmin(admin.ModelAdmin):

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

Now i can use self.request in any place

UPDATE

Changed in Django 1.6:
The get_queryset method was previously named queryset.

class MyClassAdmin(admin.ModelAdmin):

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

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)

Described how to refactor this into a mixin, with addition of the thread-safety bit based on @taha-jahangir’s answer. Here’s the 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

… and you can just call self.get_request() from any method.

Small code clarify for Diego Puente answer (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)

So you can get self.request from any other method of MyClassAdmin.

If define self.request in get_queryset method (without declaring it in __init__) PyCharm will generate warning Instance attribute attribute_name defined outside __init__.

The is no direct way to accomplish this. I see 2 possible solutions.

• Use a thread locals store to same request object

  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')
  

• If you are using simple non-threaded Django installation it is possible to save request object just as attribute:

  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')
  

This is edited version of @user27478 answer, which uses thread-local vars:

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})

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()
        # ... 

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.

Source: https://gist.github.com/pricco/24826bae3d5102d963eb13ecc0493f33

What’s wrong with this:

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