ENUM type in SQLAlchemy with PostgreSQL

Question

I\'m using SQLAlchemy core with a postgresql database and I would like to add the ENUM type to my table definition. According to the postgresql documentatio

Answer 1

The code below worked for me on SQLAlchemy 1.3.11 and Postgres 12.0.

You must first create the Enum type in postgres before creating the user table. This can be done directly through sql statement.

CREATE TYPE permission AS ENUM ('READ_ONLY', 'READ_WRITE', 'ADMIN', 'OWNER');

Then set up the project model

from flask_sqlalchemy import SQLAlchemy    

db = SQLAlchemy()

class User(db.Model): 
    __tablename__ = 'user'

    user_id = db.Column(db.Integer, primary_key=True)   
    username = db.Column(db.String(120), unique=True, nullable=False)
    password = db.Column(db.String(200), nullable=False)
    access = db.Column(db.Enum('READ_ONLY', 'READ_WRITE', 'ADMIN', 'OWNER', name="permission"))