ENUM type in SQLAlchemy with PostgreSQL

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"))

@Tim's answer is definitely correct but I wanted to offer the way I setup my ENUMs.

In my models.py I will create the values as tuples

skill_levels = ('Zero', 'A little', 'Some', 'A lot')

Then I will create a skill_level_enum variable and assign it an ENUM class with the skill level values as args.

skill_level_enum = ENUM(*skill_levels, name="skill_level")

In my table model then I pass in the skill_level_enum

class User(db.Model):
    id = db.Column(db.Integer(), primary_key=True)
    skill_level = db.Column(skill_level_enum)

I have found this makes my code a lot cleaner and I'm able to make updates to the skill_levels at the top of my file rather than scanning my models for the right thing to update.

You need to import Enum from sqlalchemy and add a name to it. It should work like this:

from sqlalchemy import Enum

person = Table("user_profile", metadata,
    Column("name", String(20)),
    Column("gender", Enum("female", "male", name="gender_enum", create_type=False))
);

You can use Python's native enums as the column type as well:

from flask_sqlalchemy import SQLAlchemy
from sqlalchemy.dialects.postgresql import ENUM as pgEnum
from enum import Enum, unique

@unique
class errorTypeEnum(Enum):
    videoValidation = 'videoValidation'
    audioValidation = 'audioValidation'
    subtitleValidation = 'subtitleValidation'

db = SQLAlchemy()

class Error(db.Model):
    serviceID = db.Column(db.String(20), primary_key=True)
    timestamp = db.Column(db.DateTime, unique=False, nullable=False)
    category = db.Column(pgEnum(errorTypeEnum), unique=False, nullable=False)