how to acccess multiple database with same tablename, in Flask and SQLAlchemy.

app.py

# -*- coding: utf-8 -*-

from flask import Flask
from sqlalchemy import SQLAlchemy

app.config['SQLALCHEMY_DATABASE_URI'] = "mysql+oursql://foo:bar@localhost/test1"

# binds multiple database definition
app.config['SQLALCHEMY_BINDS'] = {
    "db1": "mysql+oursql://foo:bar@localhost/test1",
    "db2": "mysql+oursql://foo:bar@localhost/test2"
}

class Application(Flask):
    def ready():
        db1.init_app(self)
        db2.init_app(self)

# create multiple sqlalchemy engines
db1 = SQLAlchemy()
db2 = SQLAlchemy()

app = Application()


# code in program start point
from app import app
from app.models import User, AnotherUser

@app.route('/')
def index():
    #
    # User.query(...)
    # AnotherUser.query(...)
    pass

app.ready()
app.run()

models.py

# -*- coding: utf-8 -*-

from sqlalchemy import Column
from app import db1, db2

class User(db1.Model):
    #
    # id = ...
    #
    __tablename__ = 'users'
    __bind_key__  = 'test1' # read from database 'test1'


# SHOULD use different sqlalchemy engine
# otherwise, it will cause 
#
# sqlalchemy.exc.InvalidRequestError: Table 'users' is already 
# defined for this MetaData instance.  Specify 'extend_existing=True'
# to redefine options and columns on an existing Table object.
#
class AnotherUser(db2.Model): 
    #
    # id = ...
    #
    __tablename__ = 'users'
    __bind_key__  = 'test2' # read from database 'test2'