import os
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from sqlalchemy.engine import Engine
from sqlalchemy import event
from flask.ext.babel import Babel
from config import basedir


app = Flask(__name__)
app.config.from_object('config')
db = SQLAlchemy(app)
babel = Babel(app)


@event.listens_for(Engine, "connect")
def set_sqlite_pragma(dbapi_connection, connection_record):
    cursor = dbapi_connection.cursor()
    cursor.execute("PRAGMA foreign_keys=ON")
    cursor.close()
    

from app import views, models

import os
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from sqlalchemy.engine import Engine
from sqlalchemy import event
from flask.ext.babel import Babel
from config import basedir


app = Flask(__name__)
app.config.from_object('config')
db = SQLAlchemy(app)


@event.listens_for(Engine, "connect")
def set_sqlite_pragma(dbapi_connection, connection_record):
    cursor = dbapi_connection.cursor()
    cursor.execute("PRAGMA foreign_keys=ON")
    cursor.close()
    

from app import views, models

Update __init__.py