Thanks for your reply.
The initialization of the IList was not the issue, I actually
initialized it upon population therefor it didn't issue an exception for
it (I have however rewritten it now).
The fact remains though, and I seem to have nailed down what causes it.
If I add "Index" to the HasMany-attribute, it magically works. Seems
like it cannot automatically generate the index-column, nor any name for
it, therefore NHibernate throws the IndexOutOfBoundException.
[HasMany(
typeof( CartDiscount ),
Access = PropertyAccess.FieldCamelcase,
Cascade = ManyRelationCascadeEnum.All,
RelationType = RelationType.List,
Index = "order_index"
)]
However, I tried finding any mentioning of this in the documentation but
couldn't find any, and preferrably it should throw an understandable
exception if "Index" is missing when using a List or Map relationtype,
if it isn't generated by default. Hopefully this post will help someone
in the future, and I try filing a bug-report.
Markus Zywitza wrote:
> If you put the HasMany on the IEnumerable, NH tries to add things to
> the IEnumerable. I think the error is an NH bug, because the value is
> not tested against null before checking the character. Nonetheless,
> your approach won't function.
>
> Use instead a protected or private IList for mapping and create a
> public IEnumerable that reads that IList. You should also initialize
> the backing field with a List. NH doesn't know what implementation of
> IList you want, you could have even rolled your own!
>
> So this should work:
> private IList<CartDiscount> _applicableDiscounts = new
> List<CartDiscount>();
>
> [HasMany(
> typeof( CartDiscount ),
> Access = PropertyAccess.FieldCamelcase,
> Cascade = ManyRelationCascadeEnum.AllDeleteOrphan,
> RelationType = RelationType.List
> )]
> protected IList<CartDiscount> _ApplicableDiscounts { .... }
>
> public IEnumerable<CartDiscount> ApplicableDiscounts { get {
> return _ApplicableDiscounts;} }
>
> -Markus
>
> 2009/7/15 Jimmy Shimizu <[email protected]
> <mailto:[email protected]>>
>
> Hi, I came across an issue when mapping an HasMany-collection.
>
> with the following code:
>
> private IList<CartDiscount> applicableDiscounts;
>
> [HasMany(
> typeof( CartDiscount ),
> Access = PropertyAccess.FieldCamelcase,
> Cascade = ManyRelationCascadeEnum.AllDeleteOrphan,
> RelationType = RelationType.List
> )]
> public IEnumerable<CartDiscount> ApplicableDiscounts { .... }
>
>
> My app fails to start with the following exception:
>
> [IndexOutOfRangeException: Index was outside the bounds of the array.]
> NHibernate.Mapping.Column.set_Name(String value) in
> c:\CSharp\NH\nhibernate\src\NHibernate\Mapping\Column.cs:85
>
>
>
> Looking at the sourcecode, I see this:
>
>
> public string Name
> {
> get { return name; }
> set
> {
> 85: if (value[0] == '`')
>
>
>
> and when debugging, I see that value is actually an empty string.
> however, if I change the RelationType on the collection to "Set",
> the problem goes away. Why is that? Is it trying to add some
> secret column which doesn't get a name correctly or something?
>
> Maybe this should go to NH-list instead, but it's partly an
> ActiveRecord-issue.
>
> What is the default RelationType for a generic IList<>? Bag or List?
>
>
>
>
> >
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