Workaround for https://github.com/wtforms/wtforms/issues/141

workaround.py

from flask import Flask, request
from flask.ext.sqlalchemy import SQLAlchemy

from flask.ext.admin.contrib import sqla
from flask.ext.admin import expose, Admin

app = Flask(__name__)


app.config['DATABASE_FILE'] = 'sample_db.sqlite'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + app.config['DATABASE_FILE']
db = SQLAlchemy(app)


class Model(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    uncheck_me = db.Column(db.Boolean, default=True)


class ModelAdmin(sqla.ModelView):
    def update_model(self, form, model):
        for field in form:
            if (field.type == "BooleanField") and (field.name not in request.form):
                field.data = False
        return super(ModelAdmin, self).update_model(form, model)
 
    def create_model(self, form):
        for field in form:
            if (field.type == "BooleanField") and (field.name not in request.form):
                field.data = False
        return super(ModelAdmin, self).create_model(form)
        
admin = Admin(app)
admin.add_view(ModelAdmin(Model, db.session))


def build_sample_db():
    db.drop_all()
    db.create_all()
    db.session.add(Model())
    db.session.commit()


if __name__ == '__main__':
    build_sample_db()
    app.run(debug=True, host="0.0.0.0", port=5001)