Simple demonstration of flask_app builder related views error on submit

flask_appbuilder_related_views_error

Models:

from flask.ext.appbuilder.models.datamodel import SQLAModel
from flask.ext.appbuilder import ModelView , Model
from sqlalchemy import Column, String, Float, DateTime, ForeignKey, Integer, \
    Unicode, Boolean, Date ,Constraint ,UniqueConstraint ,and_ ,or_
from sqlalchemy.orm import relationship, backref

class Parent(Model):

    """ Contains the fields of the deliverable list. """

    __tablename__ = 'parent'

    id = Column(Integer, primary_key=True, autoincrement=True)
    number = Column(Float, nullable=False)
    name = Column(String)

class Child(Model):

    """ Contains the fields of the deliverable list. """

    __tablename__ = 'child'

    id = Column(Integer, primary_key=True, nullable=False, autoincrement=True)
    number = Column(Float, nullable=False)
    name = Column(String)
    parent_id = Column(Integer, ForeignKey('parent.id'), nullable=False)

    parent = relationship('Parent')


Views:

from flask.ext.appbuilder.models.datamodel import SQLAModel
from app import appbuilder, db
from .models import Parent, Child 
from flask.ext.appbuilder import ModelView

db.create_all()

class ChildView(ModelView):
    datamodel = SQLAModel(Child)

class ParentView(ModelView):
    datamodel = SQLAModel(Parent)
    related_views = [ChildView]

appbuilder.add_view(ParentView, "Parent", icon="fa-folder-open-o", category="Stuff", category_icon='fa-envelope')
appbuilder.add_view(ChildView, "Child", icon="fa-folder-open-o", category="Stuff", category_icon='fa-envelope')