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Update connection/multiple databases docs

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I observed that many people were confused by this so I thought I'd make the multiple databases example more explicit
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Bastien Gérard 2019-06-04 21:47:28 +02:00 committed by GitHub
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docs/guide/connecting.rst
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@ -78,26 +78,30 @@ store the data and you can register all aliases up front if required.
Documents defined in different database
---------------------------------------
Individual documents can also support multiple databases by providing a
Individual documents can be attached to different databases by providing a
`db_alias` in their meta data. This allows :class:`~pymongo.dbref.DBRef`
objects to point across databases and collections. Below is an example schema,
using 3 different databases to store data::
connect(alias='user-db-alias', db='user-db')
connect(alias='book-db-alias', db='book-db')
connect(alias='users-books-db-alias', db='users-books-db')
class User(Document):
name = StringField()
meta = {'db_alias': 'user-db'}
meta = {'db_alias': 'user-db-alias'}
class Book(Document):
name = StringField()
meta = {'db_alias': 'book-db'}
meta = {'db_alias': 'book-db-alias'}
class AuthorBooks(Document):
author = ReferenceField(User)
book = ReferenceField(Book)
meta = {'db_alias': 'users-books-db'}
meta = {'db_alias': 'users-books-db-alias'}
Disconnecting an existing connection