This talk, given at PyGotham 2011, will teach you techniques using the popular NoSQL database MongoDB and the Python library Ming to write maintainable, high-performance, and scalable applications. We will cover everything you need to become an effective Ming/MongoDB developer from basic PyMongo queries to high-level object-document mapping setups in Ming.

1. R apid and Scalable Development with MongoDB, PyMongo, and Ming Rick Copeland @rick446 [email_address]

4. What is MongoDB? MongoDB (from "humongous") is a scalable, high-performance, open source, document-oriented database. Sharding, Replication 20k inserts/s? No problem Hierarchical JSON-like store, easy to develop app Source Forge. Yeah. We like FOSS

12. PyMongo: GridFS Versioning >>> file_id = fs .put( 'Moar data!', filename = 'foo.txt') >>> fs .get_last_version( 'foo.txt') .read() 'Moar data!’ >>> file_id = fs .put( 'Even moar data!', filename = 'foo.txt') >>> fs .get_last_version( 'foo.txt') .read() 'Even moar data!’ >>> fs .get_version( 'foo.txt', - 2) .read() 'Moar data!’ >>> fs .list() [u'foo.txt'] >>> fs .delete(fs.get_last_version( 'foo.txt') ._id) >>> fs .list() [u'foo.txt'] >>> fs .delete(fs.get_last_version( 'foo.txt') ._id) >>> fs .list() []

15. Ming: Engines & Sessions >>> import ming.datastore >>> ds = ming.datastore.DataStore( 'mongodb://localhost:27017', database = 'test') >>> ds .db Database(Connection('localhost', 27017), u'test') >>> session = ming.Session(ds) >>> session .db Database(Connection('localhost', 27017), u'test') >>> ming .configure(**{ 'ming.main.master':'mongodb://localhost:27017', 'ming.main.database':'test'}) >>> Session .by_name( 'main') .db Database(Connection(u'localhost', 27017), u'test')

22. Ming ORM: Classes and Collections from ming import schema, Field from ming.orm import (mapper, Mapper, RelationProperty, ForeignIdProperty) WikiDoc = collection(‘ wiki_page' , session, Field( '_id' , schema . ObjectId()), Field( 'title' , str , index = True ), Field( 'text' , str )) CommentDoc = collection(‘ comment' , session, Field( '_id' , schema . ObjectId()), Field( 'page_id' , schema . ObjectId(), index = True ), Field( 'text' , str )) class WikiPage ( object ): pass class Comment ( object ): pass ormsession . mapper(WikiPage, WikiDoc, properties = dict ( comments = RelationProperty( 'WikiComment' ))) ormsession . mapper(Comment, CommentDoc, properties = dict ( page_id = ForeignIdProperty( 'WikiPage' ), page = RelationProperty( 'WikiPage' ))) Mapper . compile_all()

23. Ming ORM: Classes and Collections (declarative) class WikiPage (MappedClass): class __mongometa__ : session = main_orm_session name= 'wiki_page’ indexes = [ 'title' ] _id =FieldProperty(S.ObjectId) title = FieldProperty( str) text = FieldProperty( str) class CommentDoc (MappedClass): class __mongometa__ : session = main_orm_session name= 'comment’ indexes = [ 'page_id' ] _id =FieldProperty(S.ObjectId) page_id = ForeignIdProperty(WikiPage) page = RelationProperty(WikiPage) text = FieldProperty( str)

29. Related Projects Ming http://sf.net/projects/merciless/ MIT License Zarkov http://sf.net/p/zarkov/ Apache License Allura http://sf.net/p/allura/ Apache License PyMongo http://api.mongodb.org/python Apache License

30. Rick Copeland @rick446 [email_address]