python - db.create_all() doesn't throw any errors and doesn't create the tables -


here's file structure:

/ /apitestproject     /models         __init__.py         users.py         items.py     /resources         __init__.py         users.py         items.py     __init__.py     index.py .deployment deploy.cmd requirements.txt run_waitress_server.py runserver.py web.config

inside main __init__.py file have: 

from flask import flask flask_sqlalchemy import sqlalchemy  postgres = {     'user': 'admin_user@pracap',     'pw': 'the_password',     'db': 'apitest',     'host': 'pracap.postgres.database.azure.com',     'port': '5432', } url = 'postgresql://{}:{}@{}:{}/{}'.format(postgres['user'], postgres['pw'], postgres['host'], postgres['port'], postgres['db'])  app = flask(__name__) app.config['sqlalchemy_database_uri'] = url app.config['sqlalchemy_track_modifications'] = false db = sqlalchemy(app)  import apitestproject.index

in index.py file have: 

from flask import flask flask_restful import api apitestproject import app, db   @app.before_first_request def create_tables():     db.create_all()  @app.route('/') @app.route('/home') def home():     return "i'm default route"

and in /models/users.py file have:

from apitestproject import db  class usermodel(db.model):     __tablename__ = 'users'      id = db.column(db.string, primary_key=true)     name = db.column(db.string(50))     address = db.column(db.string(144))     salary = db.column(db.numeric(12, 2))     position = db.column(db.string(50))     password = db.column(db.string(50))

the console not throwing errors , can run right without single hint of error. tables not created. idea might doing wrong? i've been working flask/sqlalchemy on month , i'm starting work db's.

any appreciated!

i think need work flask-migrate alternative : find this tutorial :

a short descrition here :

migrations allow manage changes make models, , propagate these changes in database. example, if later on make change field in 1 of models, need create , apply migration, , database reflect change.

after installing via 

pip install flask-migrate

edit init.py :

from flask import flask flask_sqlalchemy import sqlalchemy flask_migrate import migrate postgres = {     'user': 'admin_user@pracap',     'pw': 'the_password',     'db': 'apitest',     'host': 'pracap.postgres.database.azure.com',     'port': '5432', } url = 'postgresql://{}:{}@{}:{}/{}'.format(postgres['user'], postgres['pw'], postgres['host'], postgres['port'], postgres['db'])  app = flask(__name__) app.config['sqlalchemy_database_uri'] = url app.config['sqlalchemy_track_modifications'] = false db = sqlalchemy(app) migrate = migrate(app, db)  import apitestproject.index

and edit index.py removing db creatation via command line .

from flask import flask flask_restful import api apitestproject import app, db  @app.route('/') @app.route('/home') def home():     return "i'm default route"

after go application directory , export flask app , run script of app?? :

in cmd :

export flask_app=your_runscript.py

and 2 following commands migrate db :

flask db init

to create migration folder

and :

flask db migrate create first migration , :

flask db upgrade

to upgrade changes db

find more here flask-migrate package


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