/// <summary>
/// Get an IQueryable of parents matching a supplied IQueryable of children for this relationship.
/// </summary>
/// <typeparam name="TParent">The type of the parent Entity</typeparam>
/// <param name="children">An IQueryable of children</param>
/// <param name="options">An optional AggregateOptions object</param>
public IMongoQueryable <TParent> ParentsQueryable <TParent>(IMongoQueryable <TChild> children, AggregateOptions options = null) where TParent : Entity
{
if (typeof(TParent) == typeof(TChild))
{
throw new InvalidOperationException("Both parent and child types cannot be the same");
}
if (inverse)
{
return(children
.Join(
JoinQueryable(options),
c => c.ID,
j => j.ParentID,
(c, j) => j)
.Join(
DB.Collection <TParent>(),
j => j.ChildID,
p => p.ID,
(j, p) => p)
.Distinct());
}
else
{
return(children
.Join(
JoinQueryable(options),
c => c.ID,
j => j.ChildID,
(c, j) => j)
.Join(
DB.Collection <TParent>(),
j => j.ParentID,
p => p.ID,
(j, p) => p)
.Distinct());
}
}
