add link to change page using raw_id_fields in django admin - django

Question

Is there any chance to add link to change page of a Foreign key object next to 'raw_id_fields' in django admin?
I use raw_id_fields to reduce number of queries to mysql.
I could edit or add a foreign key object when I didn't use raw_id_fields.
How to do it with raw_id_fields?
#AntoinePinsard, I've tried the second solution. The field 'Edit My FK' was created but there is nothing except for a hyphen.
That's my modeladmin.
class FlatAdmin(admin.ModelAdmin):
inlines = [NeedInline]
readonly_fields = ('flat_house_edit_link',)
raw_id_fields = ('flat_house',)
list_display = ('show_date','show_block','show_house','show_rooms','show_price','show_stage')
list_filter = ('flat_house__house_block','flat_rooms')
search_fields = ('flat_house__id',)
field = ['flat_house','flat_house_edit_link','flat_owner','flat_price','flat_rooms','flat_total_sq','flat_life_sq','flat_kitchen_sq','flat_floors']
def flat_house_edit_link(self, instance):
if instance:
fk_id = instance.user_id
else:
fk_id = None
if fk_id:
opts = instance._meta.get_field('flat_house').rel.model._meta
related_url = reverse(
'admin:{}_{}_change/?_to_field=id&_popup=1'.format(
opts.ha,
opts.house,
),
args=[fk_id],
)
return format_html(
'<a target=_blank href="{}">Go!</a>', related_url)
else:
return "No related object"
flat_house_edit_link.short_description = "Change house"
admin.site.register(Flat,FlatAdmin)

Answer 1

Note This behavior is now built-in since Django 1.10.
You can create a custom widget to render this field as you would like to.
from django.contrib.admin.widgets import ForeignKeyRawIdWidget
from django.core.urlresolvers import reverse, NoReverseMatch
from django.utils.html import format_html
class ForeignKeyLinkedRawIdWidget(ForeignKeyRawIdWidget):
def render(self, name, value, attrs=None):
output = super().render(name, value, attrs)
try:
related_url = reverse(
'admin:{}_{}_change'.format(
self.rel.model._meta.app_label,
self.rel.model._meta.model_name,
),
args=[value],
)
except NoReverseMatch:
return output
return format_html('{output} edit',
output=output, url=related_url)
And use this widget in your form, rather than using raw_id_fields:
from myapp.forms.widgets import ForeignKeyLinkedRawIdWidget
class MyForm(forms.ModelForm):
class Meta:
model = MyModel
fields = '__all__'
widgets = {
'my_foreignkey': ForeignKeyLinkedRawIdWidget(),
}
class MyModelAdmin(admin.ModelAdmin):
form = MyForm
However, it would be much simpler to add it as a "fake" readonly_field below the actual field:
from django.core.urlresolvers import reverse
from django.utils.html import format_html
class MyModelAdmin(admin.ModelAdmin):
readonly_fields = ['my_foreignkey_link']
raw_id_fields = ['my_foreignkey']
fields = [..., 'my_foreignkey', 'my_foreignkey_link', ...]
def my_foreignkey_link(self, instance):
if instance:
fk_id = instance.my_foreignkey_id
else:
fk_id = None
if fk_id:
opts = instance._meta.get_field('my_foreignkey').rel.model._meta
related_url = reverse(
'admin:{}_{}_change'.format(
opts.app_label,
opts.model_name,
),
args=[fk_id],
)
return format_html(
'<a target=_blank href="{}">Go!</a>', related_url)
else:
return "No related object"
my_foreignkey_link.short_description = "Edit My FK"
Further reading: https://docs.djangoproject.com/en/1.9/ref/contrib/admin/#django.contrib.admin.ModelAdmin.readonly_fields

Answer 2

Here's a snippet page (updated for 6 years) that does it for me:
https://djangosnippets.org/snippets/2217/
Just use ImproveRawIdFieldsForm in place of ModelAdmin and all raw_id fields automatically links the object name displayed next to the id input.