Get all models which user a foreign key from the given model, so are related to it and should be taken care of in cleanups

django_related_model_names_discovery.py

# Author : Mahesh Gawali
# Sometimes we need to know the foreign key constraints for a given model, 
# output is a list of strings giving all model names which in some or the other way have a constraint on a field from the given model

import regex
from django.db.models.base import ModelBase

def get_all_related_model_names(model_class):
  if not isinstance(model_class, ModelBase):
    raise Exception('Django model not given properly')
    
  base_model_list=[str(m) for m in model_class._meta.get_fields()]
  model_list=list()
  for m in base_model_list:
      mod_str_list = regex.split(r'<.*: ', regex.sub(r'>', '', m))
      if len(mod_str_list) == 2:
          model_list.append(mod_str_list[1])

  model_list = list(set(model_list))
  return model_list

# usage:
# > python manage.py shell
# PASTE THIS FUNCTION
# > from django.contrib.auth.models import User
# > get_all_related_model_names(User)

# ANY UPDATES / SUGGESTIONS ARE WELCOME