How to exclude verbose_name_plural field from migration? - django

Question

Good afternoon! I'm using the verbose_name_plural dynamic field to show some up-to-date information in the admin panel.
Django version: 4.1
The model looks like this:
from django.utils.functional import lazy
from django.utils.translation import gettext_lazy as _
class Post(models.Model):
# ...
class Meta:
verbose_name = 'Post'
verbose_name_plural = lazy(lambda: _('Posts ({})').format(Post.....count()), str)()
I don't remember where I found this option to display some information, but it works great, except that every time the value changes and the command to create migrations is run, I get something like this:
from django.db import migrations
class Migration(migrations.Migration):
operations = [
migrations.AlterModelOptions(
name='post',
options={'verbose_name': 'Post', 'verbose_name_plural': 'Posts (123)'},
),
]
I found this option: https://stackoverflow.com/a/39801321/2166371
But I don’t know how relevant it is and why a class that is not used is imported there

Answer 1

Based on the variant that 0sVoid suggested, I implemented a slightly different one that seems to work without problems.
Initially, it was proposed to change one method in the main class of the admin panel (_build_app_dict): https://stackoverflow.com/a/71740645/2166371
But there is too much code in this method that I didn't want to rewrite
I rewrote another method get_app_list
Parent method:
def get_app_list(self, request, app_label=None):
"""
Return a sorted list of all the installed apps that have been
registered in this site.
"""
app_dict = self._build_app_dict(request, app_label)
# Sort the apps alphabetically.
app_list = sorted(app_dict.values(), key=lambda x: x["name"].lower())
# Sort the models alphabetically within each app.
for app in app_list:
app["models"].sort(key=lambda x: x["name"])
return app_list
My version:
def get_app_list(self, request, app_label=None):
"""
Return a sorted list of all the installed apps that have been
registered in this site.
"""
app_dict = self._build_app_dict(request, app_label)
# Sort the apps alphabetically.
app_list = sorted(app_dict.values(), key=lambda x: x["name"].lower())
# Sort the models alphabetically within each app.
for app in app_list:
app["models"].sort(key=lambda x: x["name"])
for model in app['models']:
if hasattr(model['model'], 'get_name_admin_panel'):
model['name'] = model['model'].get_name_admin_panel()
return app_list
I have added 3 new lines, before return (these lines can also be added before sorting if sequence is important to you)
There is a check that if the get_name_admin_panel method is described for the model, then we change its name to the one that the method returns
In the model itself, I added the following lines:
#classmethod
def get_name_admin_panel(cls):
return _('Posts ({})').format(Post.objects.filter(...).count())
Thanks to this, I can now set a static value for the verbose_name_plural field and the migration will not be repeated many times
If you do not specify a #classmethod, then unfortunately the admin panel page will load with an error, but I didn't see any problem with that.