MongoEngine - Extensions

MongoEngine integrates beautifully with the following libraries −

marshmallow_mongoengine

marshmallow is an ORM/ODM/framework independent serialization/deserialization library for converting complex datatypes, such as objects, to and from native Python datatypes. Using this extension of MongoEngine, we can easily perform serialize/deserialize operations.

First, create a Document class as usual as follows −

import mongoengine as me
class Book(me.Document):
title = me.StringField()

Then generate marshmallow schema with the code below −

from marshmallow_mongoengine import ModelSchema
class BookSchema(ModelSchema):
   class Meta:
      model = Book

b_s = BookSchema()

Save a document using the code:

book = Book(title='MongoEngine Book').save()

And perform serialization/deserialization using dump(0 and load() using the code below −

data = b_s.dump(book).data
b_s.load(data).data

Flask-MongoEngine

This is a Flask extension that provides integration with MongoEngine. Connection management of MongoDB database for your app is handled easily by this library. You can also use WTForms as model forms for your models.

After installation of flask-mongoengine package, initialize flask app with the following settings −

from flask import Flask
from flask_mongoengine import MongoEngine

app = Flask(__name__)
app.config['MONGODB_SETTINGS'] = {
   'db': 'mydata',
   'host': 'localhost',
   'port':27017
}
db = MongoEngine(app)

Then define a Document sub class using the below code −

class book(me.Document):
name=me.StringField(required=True)

Declare an object of above class and call save() method when a particular route is visited.

@app.route('/')
def index():
b1=book(name='Introduction to MongoEngine')
b1.save()
return 'success'

extras-mongoengine

This extension contains additional Field Types and any other wizardry.

Eve-MongoEngine

Eve is an open source Python REST API framework designed for human beings. It allows to effortlessly build and deploy highly customizable, fully featured RESTful Web Services.

Eve is powered by Flask and Cerberus and it offers native support for MongoDB data stores. Eve-MongoEngine provides MongoEngine integration with Eve.

Install and import the extension using the code below −

import mongoengine
from eve import Eve
from eve_mongoengine import EveMongoengine

Configure the settings and initialize the Eve instance.

my_settings = {
'MONGO_HOST': 'localhost',
'MONGO_PORT': 27017,
'MONGO_DBNAME': 'eve_db'
app = Eve(settings=my_settings)
# init extension
ext = EveMongoengine(app)

Define a Document class as shown below −

class Person(mongoengine.Document):
name = mongoengine.StringField()
age = mongoengine.IntField()

Add the model and run the application, finally using the below code −

ext.add_model(Person)
app.run()

Django-MongoEngine

This extension aims to integrate MongoEngine with Django API, a very popular Python web development framework. This project is still under development.

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