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diff --git a/examples/flask_alchemy/demoapp.py b/examples/flask_alchemy/demoapp.py
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+++ b/examples/flask_alchemy/demoapp.py
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+# -*- coding: utf-8 -*-
+# Copyright (c) 2015 Raphaël Barrois
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from flask import Flask
+from flask.ext.sqlalchemy import SQLAlchemy
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
+db = SQLAlchemy(app)
+
+
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(80), unique=True)
+    email = db.Column(db.String(120), unique=True)
+
+    def __init__(self, username, email):
+        self.username = username
+        self.email = email
+
+    def __repr__(self):
+        return '<User %r>' % self.username
+
+
+class UserLog(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    message = db.Column(db.String(1000))
+
+    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
+    user = db.relationship('User', backref=db.backref('logs', lazy='dynamic'))
+
+    def __init__(self, message, user):
+        self.message = message
+        self.user = user
+
+    def __repr__(self):
+        return '<Log for %r: %s>' % (self.user, self.message)