Anybody?
2009/12/2 Dmitiry Nagirnyak <[email protected]>
> Hi,
>
> I need to map 2 classes: Blog and Post.
> There is an association (blog.Posts-post.BelongsTo) with custom collection
> (that supports notification if items were added/removed).
>
> Now the questions:
>
> - What modification should be done to map the classes?
> - What XML mapping should look like?
>
> The only condition is that the tests below should not be touched and
> passing.
>
> Thanks a lot.
> Dmitriy.
>
> The code:
>
> public class Post {
> private Blog belongsTo;
> public virtual Blog BelongsTo {
> get {
> return belongsTo;
> }
> set {
> if (value == null) {
> if (belongsTo != null)
> belongsTo.Posts.Remove(this);
> } else
> value.Posts.Add(this);
> belongsTo = value;
> }
> }
> }
>
> public class Blog {
> public Blog() {
> posts = new SubscribableCollection<Post>();
> posts.OnAdded += item => {
> if (item.BelongsTo != this && item.BelongsTo != null)
> item.BelongsTo.Posts.Remove(item);
> item.BelongsTo = this;
> };
> posts.OnRemoved += item => item.BelongsTo = null;
> }
>
> private SubscribableCollection<Post> posts;
> public virtual ICollection<Post> Posts {
> get {
> return posts;
> }
> }
> }
>
>
> public class SubscribableCollection<T> : ICollection<T> {
> public event OnItemDelegate<T> OnAdded;
> public event OnItemDelegate<T> OnRemoved;
> // The implementation is stripped, you get what it does
> }
>
>
>
>
> [TestFixture]
> public class OneToMany {
>
> [Test]
> public void Assign() {
> var b = new Blog();
> var p = new Post();
>
> p.BelongsTo = b;
>
> Assert.That(b.Posts.First(), Is.SameAs(p));
> }
>
> [Test]
> public void ReAssign() {
> var b1 = new Blog();
> var b2 = new Blog();
> var p = new Post();
>
> p.BelongsTo = b1;
> p.BelongsTo = b2;
>
> Assert.That(b2.Posts.First(), Is.SameAs(p));
> Assert.That(b1.Posts, Is.Empty);
> }
>
> [Test]
> public void UnAssign() {
> var b = new Blog();
> var p = new Post();
>
> p.BelongsTo = b;
> p.BelongsTo = null;
>
> Assert.That(b.Posts, Is.Empty);
> }
>
> [Test]
> public void AddToList() {
> var b = new Blog();
> var p = new Post();
>
> b.Posts.Add(p);
> Assert.That(p.BelongsTo, Is.SameAs(b));
> }
>
> [Test]
> public void AddDuplicateToList() {
> var b = new Blog();
> var p = new Post();
>
> b.Posts.Add(p);
> b.Posts.Add(p);
> Assert.That(b.Posts.Count, Is.EqualTo(1));
> }
>
> [Test]
> public void MoveToOtherList() {
> var b1 = new Blog();
> var b2 = new Blog();
> var p = new Post();
>
> b1.Posts.Add(p);
> b2.Posts.Add(p);
>
> Assert.That(p.BelongsTo, Is.SameAs(b2));
> Assert.That(b1.Posts, Is.Empty);
> Assert.That(b2.Posts, Is.Not.Empty);
> }
>
> [Test]
> public void RemoveFomList() {
> var b = new Blog();
> var p = new Post();
>
> b.Posts.Add(p);
> b.Posts.Remove(p);
> Assert.That(p.BelongsTo, Is.Null);
> }
> }
>
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