Connecting to multiple mongodb instances from django

Question

I am using mongoengine with Django and within my project need to connect to two instances of MongoDB while serving single request. It works just fine if I use:

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Answer 1

Multiple database support was added in MongoEngine 0.6

Demo using register_connection.

alias_lists = ['users-books-db', 'user-db', 'book-db'] # list of aliases
dbs = ['author-book-pairs', 'users', 'books'] # list of databases
for alias, db in zip(alias_lists, dbs):
    register_connection(alias, db)

class User(Document):
    name = StringField()
    meta = {"db_alias": "user-db"}

class Book(Document):
    name = StringField()
    meta = {"db_alias": "book-db"}

class AuthorBooks(Document):
    author = ReferenceField(User)
    book = ReferenceField(Book)
    meta = {"db_alias": "users-books-db"}