private bool DetermineRequiresIsTypeOf(
TableMapping tableMapping, EntitySet entitySet, EntityType entityType)
{
// IsTypeOf if this is the root for this table and any derived type shares a property mapping
return entityType.IsRootOfSet(tableMapping.EntityTypes.GetEntityTypes(entitySet)) &&
((tableMapping.EntityTypes.GetEntityTypes(entitySet).Count() > 1
&& tableMapping.EntityTypes.GetEntityTypes(entitySet).Any(et => et != entityType && !et.Abstract))
||
_tableMappings.Values.Any(
tm =>
tm != tableMapping
&&
tm.Table.ForeignKeyBuilders.Any(
fk => fk.GetIsTypeConstraint() && fk.PrincipalTable == tableMapping.Table)));
}