Override model views for Flask Admin to not display blank dropdown for models with relationship annotation

gistfile1.py

#models.py

import sqlalchemy
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy.orm import class_mapper, ColumnProperty

db = SQLAlchemy()

class User(db.Model):

	id = db.Column(db.Integer, primary_key=True)
	email = db.Column(db.String(120), unique=True)
	votes = db.relationship('Vote', backref='vote_user')

	def __init__(self, email=''):
		self.email = email

	def __repr__(self):
		return '<User %r>' % self.email

	def __unicode__(self):
		return self.email

class Presentation(db.Model):
	id = db.Column(db.Integer, primary_key=True)
	url = db.Column(db.String(200), unique=True)
	owner = db.Column(db.String(2000))
	votes = db.relationship('Vote', backref='vote_presentation')

	def __init__(self, url='', owner=''):
		self.url = url
		owner = owner

	def __repr__(self):
		return '<Presentation %r %r>' % (self.url, self.owner)

	def __unicode__(self):
		return self.url


class Vote(db.Model):
	id = db.Column(db.Integer, primary_key=True)
	presentation = db.Column(db.Integer, db.ForeignKey('presentation.id'))
	user = db.Column(db.Integer, db.ForeignKey('user.id'))

	def __init__(self, user=None, presentation=None):
		self.user = user
		self.presentation = presentation

	def __repr__(self):
		return '<Vote %r %r>' % (self.presentation.url, self.user.email)

	def __unicode__(self):
		return self.user.email + ' ' + self.presentation.url




#custom views

from flask.ext.admin.contrib.sqla import ModelView
from models import User, Presentation


class GalleryUserView(ModelView):
    column_exclude_list = ['votes']
    form_excluded_columns = ['votes']

    def __init__(self, session, **kwargs):
        super(GalleryUserView, self).__init__(User, session, **kwargs)

class GalleryPresentationView(ModelView):
    column_exclude_list = ['votes']
    form_excluded_columns = ['votes']

    def __init__(self, session, **kwargs):
        super(GalleryPresentationView, self).__init__(Presentation, session, **kwargs)
        
        
#app.py
# -- put your different imports, create your app..

admin = Admin(app)
admin.add_view(GalleryUserView(db.session))
admin.add_view(GalleryPresentationView(db.session))