11/13/2023 0 Comments Flask sqlalchemy postgres![]() In order to use Flask-Migrate, we imported Manager as well as Migrate and MigrateCommand to our manage.py file. ![]() Manager.add_command('db', MigrateCommand) We want to manage database migrations to update a database's schema using Alembic which is part of Flask-Migrate.įrom flask_migrate import Migrate, MigrateCommandĪpp.om_object(os.environ) We then created an _init_() method that will run the first time we create a new result and, finally, a _repr_() method to represent the object when we query for it. a list of words that we counted minus stop words.Then, we created a Result() class and assigned it a table name of results and set the attributes that we want to store for a result: JSON columns are fairly new to Postgres and are not available in every database supported by SQLAlchemy so we need to import it specifically. We imported the database connection( db) that we created in our aka.py file as well as JSON from SQLAlchemy's PostgreSQL dialects. Self.result_no_stop_words = result_no_stop_words Id = db.Column(db.Integer, primary_key=True)ĭef _init_(self, url, result_all, result_no_stop_words): In models.py, we created a table ( results) to store the word counts results. Shall the new role be a superuser? (y/n) y $ sudo -u postgres createuser -interactive The -interactive flag will prompt us for the necessary values. We can create new roles from the command line with the createrole command. Since we just have the postgres role configured within the database. # "local" is for Unix domain socket connections only # Database administrative login by Unix domain socket $ pip install psycopg2=2.6.1 Flask-SQLAlchemy=2.1 Flask-Migrate=1.8.0įor passwordless access, we need to configure access in /etc/postgresql/9.5/main/pg_hba.conf to trust: In order to use the newly created database within the Flask app, we to need to install a few things: Wordcount_dev | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | Template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres + Template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres + Postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | Name | Owner | Encoding | Collate | Ctype | Access privileges Postgres=# CREATE DATABASE wordcount_dev ![]() We could do this in one step by running the single command psql as the postgres user with sudo like this: We can run the command we'd like with the postgres account directly with sudo.įor instance, in the last example, we just wanted to get to a Postgres prompt. $ sudo apt-get install postgresql postgresql-contrib
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