Sample sqlalchemy flasks around an existing database

Question

Problem: There should be a full working example of automatically binding sqlalchemy to an existing database in a multi-link application.

I want to bind to two databases and have one automatic table map. I need to do this because I do not have control over one database, so I will have to constantly rewrite my models and delete new tables every time I transfer.

I like the answers here , but I can't get it to work in Flask (I can use sqlalchemy only for the query as per the example).

Model.py, which I installed from the above example, leads to

EDIT I pulled the line

 db.Model.metadata.reflect[db.engine]

from another post, and it should be db.Model.metadata.reflect (db.engine) a very simple solution

here is my model.py

from app import db
from sqlalchemy.orm import relationship

db.Model.metadata.reflect[db.engine]#change to (db.engine)

class Buildings(db.Model):
    __table__ = db.Model.metadata.tables['test']
    __bind_key__ = 'chet'
    def __repr__(self):
        return self.test1

.... other models from sqlalchemy uri here...

i get it

>>> from app import db, models
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "app/__init__.py", line 69, in <module>
    from app import views, models
  File "app/views.py", line 1, in <module>
    from app import app,models, db
  File "app/models.py", line 163, in <module>
    db.Model.metadata.reflect[db.engine]
TypeError: 'instancemethod' object has no attribute '__getitem__'

Here is my config.py

SQLALCHEMY_DATABASE_URI = 'postgresql://chet@localhost/ubuntuweb'

SQLALCHEMY_BINDS = {
    'chet':        'postgresql://chet@localhost/warehouse',
 }

here is my init.py file

from flask import Flask
from flask_bootstrap import Bootstrap
from flask.ext.sqlalchemy import SQLAlchemy
from flask.ext.admin import Admin, BaseView, expose
from flask.ext.script import Manager
from flask.ext.migrate import Migrate, MigrateCommand
from flask.ext.login import LoginManager, UserMixin, login_required

app = Flask(__name__)

app.config['UPLOAD_FOLDER'] = 'app/static'
app.config.from_object('config')
db = SQLAlchemy(app)
migrate = Migrate(app, db)
manager = Manager(app)
manager.add_command('db', MigrateCommand)

Bootstrap(app)

from app import views, models
admin = Admin(app)

Answer 1

In your code

db.Model.metadata.reflect[db.engine]

When should it be

db.Model.metadata.reflect(db.engine)  # parens not brackets

This should have been pretty obvious from the stack trace ....