Managing databases in Django models, sqlite and mongoengine
I found a solution, It's very simple. If you want your model to use mongoDB database, just create model class witch Document parameter (or EmbeddedDocument, for example class Magazine(Document):). but if you prefer default database type defined, just create class, like in django documentation (example class Person(models.Model):).
I'm developing some project in Django, something to manage assets in warehouses. I want to use two databases to this. First is sqlite database, which contains any data about users. Second is mongoDB database,in which  want to store all the data related to assets. The question is, how to tell to my model classes, which database they should use (models responsible for user registration etc - sqlite, models responsible for managing assets data - mongoDB)? I read about DATABASE_ROUTERS and using Meta classes, but it's solutions for supported databases by Django (or maybe I don't know something), I dont know if it's good and possible to integrate it with mongoengine. 
Thanks for any tip!