7e980a16d0
The IntField in unset if the IntField value doesn't validate to "truthify" (therefore, is set as 0) and the default value of the IntField in question is 0. This is not a logical functionality in my opinion. Take this example. You have an IntField that is a counter which can be incremented and decremented. This counter has the default value of 0 and is a required field. Every time the counter reaches 0, the field is unset.
===========
MongoEngine
===========
:Info: MongoEngine is an ORM-like layer on top of PyMongo.
:Repository: https://github.com/MongoEngine/mongoengine
:Author: Harry Marr (http://github.com/hmarr)
:Maintainer: Ross Lawley (http://github.com/rozza)
.. image:: https://secure.travis-ci.org/MongoEngine/mongoengine.png?branch=master
:target: http://travis-ci.org/MongoEngine/mongoengine
About
=====
MongoEngine is a Python Object-Document Mapper for working with MongoDB.
Documentation available at http://mongoengine-odm.rtfd.org - there is currently
a `tutorial <http://readthedocs.org/docs/mongoengine-odm/en/latest/tutorial.html>`_, a `user guide
<https://mongoengine-odm.readthedocs.org/en/latest/guide/index.html>`_ and an `API reference
<http://readthedocs.org/docs/mongoengine-odm/en/latest/apireference.html>`_.
Installation
============
If you have `setuptools <http://peak.telecommunity.com/DevCenter/setuptools>`_
you can use ``easy_install -U mongoengine``. Otherwise, you can download the
source from `GitHub <http://github.com/MongoEngine/mongoengine>`_ and run ``python
setup.py install``.
Dependencies
============
- pymongo 2.1.1+
- sphinx (optional - for documentation generation)
Examples
========
Some simple examples of what MongoEngine code looks like::
class BlogPost(Document):
title = StringField(required=True, max_length=200)
posted = DateTimeField(default=datetime.datetime.now)
tags = ListField(StringField(max_length=50))
class TextPost(BlogPost):
content = StringField(required=True)
class LinkPost(BlogPost):
url = StringField(required=True)
# Create a text-based post
>>> post1 = TextPost(title='Using MongoEngine', content='See the tutorial')
>>> post1.tags = ['mongodb', 'mongoengine']
>>> post1.save()
# Create a link-based post
>>> post2 = LinkPost(title='MongoEngine Docs', url='hmarr.com/mongoengine')
>>> post2.tags = ['mongoengine', 'documentation']
>>> post2.save()
# Iterate over all posts using the BlogPost superclass
>>> for post in BlogPost.objects:
... print '===', post.title, '==='
... if isinstance(post, TextPost):
... print post.content
... elif isinstance(post, LinkPost):
... print 'Link:', post.url
... print
...
>>> len(BlogPost.objects)
2
>>> len(HtmlPost.objects)
1
>>> len(LinkPost.objects)
1
# Find tagged posts
>>> len(BlogPost.objects(tags='mongoengine'))
2
>>> len(BlogPost.objects(tags='mongodb'))
1
Tests
=====
To run the test suite, ensure you are running a local instance of MongoDB on
the standard port, and run: ``python setup.py test``.
Community
=========
- `MongoEngine Users mailing list
<http://groups.google.com/group/mongoengine-users>`_
- `MongoEngine Developers mailing list
<http://groups.google.com/group/mongoengine-dev>`_
- `#mongoengine IRC channel <http://webchat.freenode.net/?channels=mongoengine>`_
Contributing
============
We welcome contributions! see the`Contribution guidelines <https://github.com/MongoEngine/mongoengine/blob/master/CONTRIBUTING.rst>`_