Make it possible to cross reference between tables and make table extensions. Regarding relations

[meatcorps]

I have been playing around with this package. But I really miss the feature in the table extensions that is not referencing the database it self:

partial void OnAfterConstruct()
{
}

Yes you can make very handy table extensions here. But in my use case I really like to add extension method. For example. Person has items. Persons and items are a many to many relation.

By only referencing the database as well this make it possible:

public sealed partial class PersonRelationTable
{
private MemoryDatabase _database;

    partial void OnAfterConstruct(MemoryDatabaseBase db)
    {
        _database = (MemoryDatabase)db;
    }

    public IEnumerable<RelationItem> GetItemsFromPerson(int personId)
    {
        foreach (var item in _database.PersonRelationItemTable.FindByPersonId(personId))
        {
            yield return _database.RelationItemTable.FindByItemId(item.ItemId);
        }
    }
}

Btw I already made the change. So if you are interested in my changes let me know. Also thank you for the amazing work!

[meatcorps]

I created a pull request for it:

#116