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

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

b_s = BookSchema()

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

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

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)

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

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

import mongoengine
from eve import Eve
from eve_mongoengine import EveMongoengine

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

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

ext.add_model(Person)
app.run()