Django admin site change_list view customization

Question

I have a ModelAdmin subclass for my gradeScalesSettings model:

@admin.register(gradeScalesSetting)
class gradeScalesSettingAdmin(admin.ModelAdmin):
    list_display = ('configuration_select', 'NumberOfGrades', 'Rounding','Precision', 'Status',)
    change_list_template = 'admin/Homepage/view.html'

Actual result

After I click Grade Scale Settings:

How to connect it to my views.py? This is what I want to code in my views.py:

def gradescales(request):
    gradeScalesSettings = gradeScalesSetting.objects.all()
    configurations = configuration.objects.all()
    rounding = gradeScalesSetting.objects.all().values_list('Rounding', flat=True).distinct()
    print(rounding)
    return render(request, 'Homepage/gradescale.html', {"rounding": rounding,"gradeScalesSetting":gradeScalesSettings,"configurations":configurations})

When I tried this:

@admin.register(gradeScalesSetting)
class gradeScalesSettingAdmin(admin.ModelAdmin):
    def new_NumberOfGrades(self, obj):
        if obj.NumberOfGrades == 'Grade Scale Settings':
            return '<a href="view.html" </a>'  # this url will redirect to your

In my ModelAdmin subclass:

list_display = ('configuration_select', 'new_NumberOfGrades', 'Rounding','Precision', 'Status',)

Is there any way to connect it to my views.py?

Expected result

This is what I want to show in my view.html:

That is why I want to connect it to my views.py.

What's the difference between view.html and gradescale.html? — aaron, Dec 01 '19 at 04:17

score 6 · Answer 1 · answered Dec 01 '19 at 04:37

Override ModelAdmin.changelist_view to set extra_context.

@admin.register(gradeScalesSetting)
class gradeScalesSettingAdmin(admin.ModelAdmin):
    list_display = ('configuration_select', 'NumberOfGrades', 'Rounding','Precision', 'Status',)
    change_list_template = 'admin/Homepage/view.html'

    def changelist_view(self, request, extra_context=None):
        extra_context = extra_context or {}

        gradeScalesSettings = gradeScalesSetting.objects.all()
        configurations = configuration.objects.all()
        rounding = gradeScalesSetting.objects.all().values_list('Rounding', flat=True).distinct()

        extra_context.update({
            "rounding": rounding,
            "gradeScalesSetting": gradeScalesSettings,
            "configurations": configurations,
        })
        return super().changelist_view(request, extra_context=extra_context)

After that, where exactly should I implement the new context variables in the corresponding template? — 101is5, Jan 25 '22 at 12:23
I just wanted to know wheter this alone does the trick, or customizing change_list.html is also necessary in order to effectivelly render the customizations. This looks like my problem almost exactly. — 101is5, Jan 25 '22 at 12:40
Customizing change_list.html (as OP does with admin/Homepage/view.html) is necessary. — aaron, Jan 25 '22 at 14:46

score 0 · Answer 2 · answered Dec 06 '19 at 06:12

You can alter routing for ModelAdmin by overriding get_urls:

class gradeScalesSettingAdmin(admin.ModelAdmin):
    def get_urls(self):
        urls = super().get_urls()
        pat = [i for i in urls if str(i.name).endswith('changelist')][0]  # Find needed path object to replace
        index = urls.index(pat)
        urls[index] = path(pat.pattern._route, gradescales)
        return urls

This way you can have full control of a view used for your admin page and even add additional pages (more than only changelist and edit views) as you want.

If you do not need additional default views like object edit page, you can simplify code above by replacing original urls instead of searching one needed and patching:

class gradeScalesSettingAdmin(admin.ModelAdmin):
    def get_urls(self):
        urls = [
            path('', gradescales)
        ]
        return urls

Django admin site change_list view customization

Actual result

Expected result

2 Answers2