Contents
Release v0.0.5 (What’s new?).
Welcome to mongoengine_mate Documentation¶
mongoengine_mate includes lots more utility method in ORM model Class, makes mongoengine more powerful.
Usage¶
import mongoengine
from mongoengine_mate import ExtendedDocument
class User(ExtendedDocument):
id = mongoengine.IntField()
name = mongoengine.StringField()
First, you got better __repr__() like:
>>> User(id=1, name="Alice")
User(id=1, name="Alice")
# access its collection or database
>>> col_user = User.col()
>>> col_user.find({"_id": 1})
>>> col_db = User.db()
# access its field name in order
>>> User.fields_ordered()
["id", "name"]
# provide dictionary-like api
>>> user = User(id=1, name="Alice")
>>> user.keys()
["id", "name"]
>>> user.values()
[1, "Alice"]
>>> user.items()
[("id", "name"), (1, "Alice")]
>>> user.to_dict()
{"id": 1, "name": "Alice"}
>>> user.to_OrderedDict()
OrderedDict([("id", "name"), (1, "Alice")])
Smart Insert - Skip Primary Key Conflict¶
When you do batch insert, sometimes one or a few documents may cause _id field conflict error, which is breaking the batch insert operation.
Usually you have to write a for loop` and use ``try ... except ... to ignore conflict. But, it is SLOW!
ExtendedDocument.smart_insert provides a fast and convenient way to batch insert lots of document at once correctly.
# insert one document which breaks the batch insert
User(id=100, name="Obama").save()
# smart_insert, automatically handle NotUniqueError
User.smart_insert([
User(id=1, name="Alice"),
User(id=2, name="Bob"),
...
User(id=1000, name="Zillow"),
])
Smart Update - Batch Upsert¶
When you do batch update, you mostly want to use the _id field to locate which document you want to update.
>>>User(id=2, name="Bob").save()
# update only
>>> User.smart_update([
User(id=1, name="Alice"),
User(id=2, name="Bruce"),
User(id=3, name="Cathy"),
], upsert=False)
>>> User.objects.count()
1
# upsert
>>> User.smart_update([
User(id=1, name="Alice"),
User(id=2, name="Bruce"),
User(id=3, name="Cathy"),
], upsert=True)
>>> User.objects.count()
3
Install¶
mongoengine_mate is released on PyPI, so all you need is:
$ pip install mongoengine_mate
To upgrade to latest version:
$ pip install --upgrade mongoengine_mate
About the Author¶
(\ (\
( -.-)o I am a lovely Rabbit!
o_(")(")
Sanhe Hu is a very active Python Developer Since 2010. Research area includes Machine Learning, Big Data Infrastructure, Block Chain, Business Intelligent, AWS, Distributive System. Love photography, outdoor, arts, game, and also the best Python.
- My Github: https://github.com/MacHu-GWU
- My HomePage: http://www.sanhehu.org/
- My Linkedin: https://www.linkedin.com/in/sanhehu/
