Override (save_model) in django admin for All models/apps in projects

Question

How could I implement override save method for all models in all Apps inside Admin panel?

def save_model(self, request, obj, form, change):
    
    pass

I can implement it in one or two models "inherit and adding it in register method", but I really need it to execute whenever admin clicks save in Admin panel and implement some code before save.

Answer 1

In my team we already overridden ModelAdmin class. Answer depends on your project.

In examples i use old python super() sintaxis, it helps to debug the code.

Easy way with class. Create somewhere in project

from django.contrib.admin import ModelAdmin:

Class ModelAmin(ModelAdmin):
    def save_model(self, *args, **kwargs):
        # do some staff before
        super(ModelAdmin, self).save_model(*args, **kwargs)
        # do some staff after

Everywhere in project made find from django.contrib.admin import ModelAdmin replace to from module.with.myModelAdmin import ModelAdmin .

All next ModelAdmins you should build with your ModelAdmin .

Second way with ModelAdminMixin . Code is fast the same. Somethere put mixin:

Class ModelAminMixin:
    def save_model(self, *args, **kwargs):
        # do some staff before
        super(ModelAdminMixin, self).save_model(*args, **kwargs)
        # do some staff after

Everywhere in project made find with regexp class BlaBlaBla(bla, bla, ModelAdmin): and replace to class BlaBlaBla(bla, bla, ModelAdminMixin, ModelAdmin): .

All next ModelAdmins you should build with inheritance from ModelAdminMixin and ModelAdmin . This is a little bit more flexible: you can decide add or not this mixin.

Next Way - MonkeyPatching .

Somethere put your mixin from "second way". Somethere in admin.py:

from django.contrib.admin import ModelAdmin.
from module.with.myModelAdminMixin import ModelAdminMixin

ModelAdmin.__bases__ = (ModelAdminMixin,) + ModelAdmin.__bases__

After that you should not do something else. But it is a wrong way to code. Is "monkey patching" really that bad?