django admin how to add context when using custom action button? - django

Question

I have a custom action button "Add post" for each record in my admin panel. I want to save in context obj.id to use it for a default value in admin:channels_post_add form
class ChannelAdmin(admin.ModelAdmin):
list_display = ['title','username', 'invite_link', 'account_actions']
def account_actions(self, obj):
!!!! I WANT TO ADD CONTEXT HERE!!!!
return format_html('<a class="button" href="{}">Add post</a>', reverse('admin:channels_post_add'))
account_actions.short_description = 'Actions'
account_actions.allow_tags = True
class Meta:
model = Channel
admin.site.register(Channel, ChannelAdmin)
class PostAdmin(admin.ModelAdmin):
list_display = ['text', 'media', 'send_type', 'created']
class Meta:
model = Post
def get_form(self, request, obj=None, **kwargs):
form = super(PostAdmin, self).get_form(request, obj, **kwargs)
try:
post_id = !!! AND USE IT HERE!!!!
form.base_fields['channels'].initial = post_id
except Exception as e:
print(e)
return form

Answer 1

You can add GET parameters to the url.
url = "%s?pid=%s" % (reverse(admin:channels_post_add), obj.id)
And then request.GET.get("pid") in get_form():
class ChannelAdmin(admin.ModelAdmin):
...
def account_actions(self, obj):
url = "%s?pid=%s" % (reverse(admin:channels_post_add), obj.id)
return format_html('<a class="button" href="{}">Add post</a>', url)
class PostAdmin(admin.ModelAdmin):
...
def get_form(self, request, obj=None, **kwargs):
form = super(PostAdmin, self).get_form(request, obj, **kwargs)
try:
form.base_fields['channels'].initial = request.GET.get("pid")
except Exception as e:
print(e)
return form
I think you have to use ModelAdmin.get_changeform_initial_data(request)(Django Docs) to set initial value.
A hook for the initial data on admin change forms. By default, fields
are given initial values from GET parameters. For instance,
?name=initial_value will set the name field’s initial value to be
initial_value.
This method should return a dictionary in the form {'fieldname':
'fieldval'}:
url = "%s?channels=%s" % (reverse(admin:channels_post_add), obj.id)
or
def get_changeform_initial_data(self, request):
return {'channels': request.GET.get("pid")}