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HumbleDB - MongoDB Object-Document Mapper

Project description

HumbleDB is an extremely lightweight ODB that works with pymongo to provide a convenient and easy to use interface. It enforces strict explictness when a connection to a MongoDB cluster or replica set is being used, by disallowing any read or write interaction outside of a context manager’s context block.

Quick Example

>>> from humbledb import Mongo, Document
>>> # config_database and config_collection are required attributes
>>> class TestDoc(Document):
...     config_database = 'test'
...     config_collection = 'testdoc'
...     test_key = 't'
...     other_key = 'o'
>>> # When you create a Document instance, you can set its keys via any
>>> # mapped attributes you create
>>> doc = TestDoc()
>>> doc.test_key = 'Hello'
>>> doc.other_key = 'World'
>>> # The __repr__ for the instance shows the actual doc
>>> doc
TestDoc({'t': 'Hello', 'o': 'World'})
>>> # A Document instance is also a dict, but you have to access the key
>>> # names directly
>>> doc['o']
>>> # Or use the mapped attribute
>>> doc[TestDoc.test_key]
>>> # The Mongo class manages database connection and is a context manager
>>> with Mongo:
...     TestDoc.insert(doc)
>>> with Mongo:
...     found = TestDoc.find_one()
>>> found
TestDoc({u'_id': ObjectId('50ad81586112797f89b99606'), u't': u'Hello', u'o': u'World'})
>>> doc
TestDoc({'_id': ObjectId('50ad81586112797f89b99606'), 't': 'Hello', 'o': 'World'})
>>> found['_id']
>>> found['t']
>>> found.test_key

The two main parts to HumbleDB are the Document class and the Mongo class.

The Document class

HumbleDB Document classes are subclasses of dicts, which mean they play quite nicely with the underly pymongo interface. An individual Document subclass works both as a document instance and as an interface to that document’s collection.

The Document superclass provides some nice conveniences for its subclasses:

  1. You can map short key names, to long, human readable attributes, for easy access and better understandability in code.
  2. All of the pymongo.Collection methods are mapped onto the Document subclass for easy access.
  3. All documents returned by query operations are converted into instances of your subclass.

The Mongo class

The Mongo class is a superclass designed to hold a long-lived pymongo.Connection instance. Since pymongo 2.2, pymongo has had the ability to support greenlets and concurrent access via socket pools, and the Mongo superclass is designed with this in mind. It primarily acts as a context manager, allowing you to minimize the amount of time that a greenlet or thread holds a socket out of the socket pool. In its most basic functioning, this context manager behavior is a wrapper around Connection.start_request().

Here is a basic example of a Mongo subclass:

from humbledb import Mongo

class MyCluster(Mongo):
   config_host = ''
   config_port = 30001

The Mongo class can be used directly, without subclassing, if all you need is access to the default host and port (localhost and 27017). In production environments, where multiple database clusters are often in use, subclassing lets you be explicit in which cluster you’re connecting to. Subclassing also allows you to connect to named replica sets:

from humbledb import Mongo

class MyReplicaSet(Mongo):
   config_host = ''
   config_port = 30002
   config_replica = 'ReplicaSetName'

Project details

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humbledb-1.1.0.tar.gz (8.4 kB) Copy SHA256 hash SHA256 Source None Nov 29, 2012

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