Child models in flask-admin edit model view

edit_child.html

{% extends 'admin/model/edit.html' %}

{% macro table(columns, items, endpoint) %}
<table class="table table-striped table-bordered model-list">
	<thead>
	    <tr>
	    	<th></th>
	    	{% for c in columns %}
	    	<th>{{ c }}</th>
	    	{% endfor %}
	    </tr>
	</thead>
	{% for item in items %}
	<tr>
		<td>
			<a class="icon" href="{{ url_for(endpoint + '.edit_view', id=item.id, url=edit_url) }}"><i class="icon-pencil"></i></a>

			<form class="icon" method="POST" action="{{ url_for(endpoint + '.delete_view', id=item.id, url=return_url) }}">
                <button onclick="return confirm('{{ _gettext('You sure you want to delete this item?') }}');">
                    <i class="icon-remove"></i>
                </button>
            </form>
		</td>
		{% for c in columns %}
		<td>
			{{ item[c] }}
		</td>
		{% endfor %}
	</tr>
	{% endfor %}
{% endmacro %}

{% block body %}
	{{ super() }}

	{{ table(['id', 'name'], children, 'child') }}
{% endblock %}

simple.py

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

from flask.ext.admin.contrib import sqlamodel
from flask.ext import admin

# 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:///test.sqlite'
app.config['SQLALCHEMY_ECHO'] = True
db = SQLAlchemy(app)


# Create models
class Parent(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(120))

    def __unicode__(self):
        return self.name


class Child(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.Unicode(64))

    parent_id = db.Column(db.Integer(), db.ForeignKey(Parent.id))
    parent = db.relationship(Parent, backref='children')

    def __unicode__(self):
        return self.name


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


# Customized Post model admin
class ParentAdmin(sqlamodel.ModelView):
    edit_template = 'edit_child.html'

    @admin.expose('/edit/')
    def edit_view(self):
        id = request.args.get('id')

        children = db.session.query(Child).filter_by(parent_id=id)

        self._template_args.update(dict(children=children,
                                        edit_url=url_for('.edit_view', id=id)))

        return super(ParentAdmin, self).edit_view()


if __name__ == '__main__':
    # Create admin
    a = admin.Admin(app, 'Simple Models')

    # Add views
    a.add_view(ParentAdmin(Parent, db.session))
    a.add_view(sqlamodel.ModelView(Child, db.session, endpoint='child'))

    # Create DB
    db.create_all()

    # Start app
    app.debug = True
    app.run('0.0.0.0', 8000)