Hello,
I am a fan of the PersistenceSpecification class. It is a really nice
feature that I am able to test properties that are readonly together
with an Add method. Here's an example (only relevant parts included):
public class Board
{
private readonly ISet<Board> successors = new
HashedSet<Board>();
public virtual IEnumerable<Board> Successors
{
get { return successors; }
}
public virtual void AddSuccessor(Board successor)
{
successors.Add(successor);
}
}
public class BoardMap : ClassMap<Board>
{
public BoardMap()
{
HasManyToMany(x => x.Successors)
.Access.ReadOnlyPropertyThroughLowerCaseField()
.ParentKeyColumn("ParentId")
.ChildKeyColumn("ChildId")
.Cascade.All()
.AsSet()
.Table("Successors");
}
}
This is the way I like to have things. Successors property is readonly
and there's an AddSuccessor method instead. To test this with
PersistenceSpecification class
I need to specify how to use the AddSuccessor method. Luckily this is
possible. Here's how it's done:
[Test]
public void VerifyBoardMappings()
{
using (var session = SessionFactory.OpenSession())
{
new PersistenceSpecification<Board>(session)
.CheckList(b => b.Successors,
new HashSet<Board>() {
Board.Start.Play(Move.D3) },
(board, successor) =>
board.AddSuccessor(successor))
.VerifyTheMappings();
}
}
An explanation:
"b => b.Successors"
This line identifies which list property we are testing. It should
compare same before and after database round-trip.
"new HashSet<Board>() { Board.Start.Play(Move.D3) }"
This line is an IEnumerable<Board> with values to place in the list
property.
"(board, successor) => board.AddSuccessor(successor))"
This line identifies an action with a custom method of adding values
to the list property.
That's all there is to it. I can really recommend using the
PersistenceSpecification class to verify your mappings.
It would also be nice if the wiki page could be updated with examples
like the above.
Regards,
Daniel Lidström
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