inline_form_choices.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import String, Enum
import flask_admin as admin
from flask_admin.contrib import sqla


# Create application
app = Flask(__name__)


# Create dummy secrey key so we can use sessions
app.config['SECRET_KEY'] = '123456790'

# Create in-memory database
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///a_sample_database.sqlite'
app.config['SQLALCHEMY_ECHO'] = True
db = SQLAlchemy(app)


# Flask views
@app.route('/')
def index():
    return '<a href="/admin/">Click me to get to Admin!</a>'


class Pet(db.Model):
    __tablename__ = 'pet'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    petname = db.Column(String(20), nullable=False, unique=True)
    favorite_day = db.Column(Enum('Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'),
                         nullable=True)


class PetAdmin(sqla.ModelView):
    column_editable_list = ('petname', 'favorite_day')
    form_choices = {
        'favorite_day': [ ('', '<leave empty>'), ('Monday', 'Monday'), ('Tuesday', 'Tuesday'),
                         ('Wednesday', 'Wednesday'), ('Thursday', 'Thursday'), ('Friday', 'Friday'),
                         ('Saturday', 'Saturday'), ('Sunday', 'Sunday'),]
    }


# Create admin
admin = admin.Admin(app, name='Inline Enum Form Choices Issue', template_mode='bootstrap3')

admin.add_view(PetAdmin(Pet, db.session))

if __name__ == '__main__':

    # Create DB
    db.drop_all()
    db.create_all()
    db.session.add(Pet(petname='Flipper', ))
    db.session.add(Pet(petname='Lassie', ))
    db.session.add(Pet(petname='Jumbo', favorite_day='Monday'))
    db.session.commit()

    # Start app
    app.run(debug=True)
    

Illustrates this issue in flask-admin.