Lazy loading and Eager initialization for Component

[megafetis]

For example:

class Organization
{
    public virtual string Name {get;set;}
    public virtual Address Address {get;set;}
}
class Address
{
    public virtual string City {get;set;}
    public virtual Address Street {get;set;}
}

protected OrganizationMap()
{
    Id(p => p.Id).GeneratedBy.UuidHex("N").Length(32);
    Component(p => p.Address, a =>
    {
        a.LazyLoad();
        a.ColumnPrefix("adr_");
        a.Map(p => p.Street);
        a.Map(p => p.City);
    });   
    Map(p => p.Name).Not.Nullable();
}

var orgs = nHsession.QueryOver<Organization>().Fetch(p=>p.Address).Eager.List();

Please add feature to Eager load mapped as Component properties

[fredericDelaporte]

#1599 will provide a way to fetch entities with their lazy properties, in NHibernate 5.2. Will it be enough?

[megafetis]

That would be great, to implement partial eager initialization of model.
For example, we have some lazy properties or components.
Adding possibility to selectively (optionally) eager load some of these properties.

I see, that now is possible to load ALL lazy properties immediately

[megafetis]

Example:
3) SelectMode.FetchLazyProperties you can fetch entities with lazy properties initialized:
4) SelectMode.FetchLazyProperty !!!
var root = session.QueryOver<EntityComplex>() .Fetch(SelectMode.FetchLazyProperty, ec => ec.SomeProperty1) .Fetch(SelectMode.FetchLazyProperty, ec => ec.SomeProperty2) .Where(ec => ec.SomeProperty1!= null) .Take(1) .SingleOrDefault();

[fredericDelaporte]

Yes, currently, loading lazy properties is an all or nothing process (excepted for lazy many-to-one or lazy collections, which have their own loaders and are loaded separately).

There is no way to load only some of the lazy properties, excepted using some projections to a custom DTO (but then, it is no more an entity loading).

There are some old todo in the code about handling property groups for loading only part of them, but it seems far from being done.

[megafetis]

Its a pity. But I want to thank you about very useful and favorite library Nhibernate

[fredericDelaporte]

You should leave it open if you wish someone to maybe have a look into implementing this some days.

[megafetis]

Ok thanks