simple test flask sqlalchemy app

requirements.txt

click==6.7
Flask==0.12.2
Flask-SQLAlchemy==2.3.2
itsdangerous==0.24
Jinja2==2.9.6
MarkupSafe==1.0
psycopg2==2.7.3.2
SQLAlchemy==1.1.14
Werkzeug==0.12.2

testapp.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy.orm import load_only
from sqlalchemy import func, text


app = Flask(__name__)
db = SQLAlchemy()


class config(object):
    DEBUG = True
    SQLALCHEMY_DATABASE_URI = 'postgresql://testapp:testapp@localhost' +\
        ':5432/testapp'


class Contact(db.Model):
    id = db.Column(db.BigInteger, primary_key=True)
    email = db.Column(db.String(128))


def setup_db():
    with app.test_request_context():
        db.create_all()
        db.session.add(Contact(email='abc@abc.com'))
        db.session.add(Contact(email='abc1@abc.com'))
        db.session.add(Contact(email='abc@abc.com'))
        db.session.add(Contact(email='abc2@abc.com'))
        db.session.add(Contact(email='abc1@abc.com'))
        db.session.commit()


@app.route('/')
def test_having():
    """all_records = db.session.query(Contact).options(
        load_only('email')).group_by(Contact.email).having(
        func.count('*') > 1).all()"""
    # ^ doesn't work
    """
    all_records = db.session.query(func.count(Contact.id)).options(
        load_only('email')).group_by(Contact.email).having(
        func.count('*') > 1).all()"""
    # ^ doesn't work
    all_records = db.session.execute(
        "SELECT count(*), email FROM contact group by email"
        " having count(*) > 1").fetchall()
    return 'Finally! ' + str(len(all_records))


if __name__ == '__main__':
    app.config.from_object(config)
    db.init_app(app)
    setup_db()
    app.run()