Running manage.py makemigrations for multiple databases in django - django-models

Question

I'm trying to use multiple databases in my Django project i.e. MongoDB and MySQL.
# settings.py
DATABASES = {
'default': {
'NAME': 'sql_db',
'ENGINE': 'django.db.backends.mysql',
'USER': 'root',
'PASSWORD': 'root'
},
'mongoproject': {
'ENGINE' : 'djongo',
'NAME': 'mongo_db'
}
}
I create my model for eg
# App/models.py
class ForSQL(models.Model):
Name = models.CharField(max_length=50)
City = models.CharField(max_length=50)
I want to save it in MySQL.
For that, I will run manage.py makemigrations and then manage.py migrate. It will save in MySQL.
But when I add one more table in models.py file like:
# App/models.py
class Mongo(models.Model):
Name = models.CharField(max_length=50)
City = models.CharField(max_length=50)
I want to save this table in MongoDB.
If I run manage.py makemigrations and then run manage.py migrate --database=mongoproject, it saves 'Mongo' Table in MongoDB and also saves 'ForSQL' table in MongoDB because of previous migrations.
I need help in setting routers for differentiating migrations on each table.
I looked for this solution but can't get them working.

Answer 1

Here's how I solved my problem
# routers.py
import App.models
allmodels = dict([(name.lower(), cls) for name, cls in App.models.__dict__.items() if isinstance(cls, type)])
def allow_migrate(self, db, app_label, model_name = None, **hints):
""" migrate to appropriate database per model """
try:
model = allmodels.get(model_name)
return(model.params.db == db)
except:
pass
# App/models.py
class ForSQL(models.Model):
class params:
db = 'default'
Name = models.CharField(max_length=50)
City = models.CharField(max_length=50)
class Mongo(models.Model):
class params:
db = 'mongoproject'
Name = models.CharField(max_length=50)
City = models.CharField(max_length=50)
Then simply run commands manage.py makemigrations and manage.py migrate --database=default for default database (in my case MySQL) and manage.py migrate --database=mongoproject for MongoDB.
It will save ForSQL table in MySQL and Mongo table in MongoDB.
This is what I exactly needed.
Hope it will help someone.
Here it is what helped me https://stackoverflow.com/a/60453322/12134251