PersistenceSpecification NHibernate Free Checklist

Question

I am currently working on a college project in which we use Fluent NHibernate. I am working on how to create tests for our objects and Fluent mappings.

However, I was stumped trying to figure out how to use the PersistenceSpecification checklist.

unit test fails with the following error:

MvcShop.Core.Tests.EntitiesTests.ItemTest.CanMapItem threw exception:  NHibernate.PropertyValueException: not-null property references a null or transient valueMvcShop.Core.Entities.ItemPicture.Item.

The test is defined as:

private IList<ItemPicture> _itemPictures = new List<ItemPicture>()
{
new ItemPicture { Filename = "test.jpg", Title = "Test title", PrimaryPicture = true},
        new ItemPicture { Filename = "test2.jpg", Title = "Test title 2" }
    };

    [TestMethod]
    public void CanMapItem()
    {
        new PersistenceSpecification<Item>(Session)
            .CheckProperty(i => i.Title, "Test item")
            .CheckProperty(i => i.Description, "Test description")
            .CheckProperty(i => i.SalesPrice, (decimal)0.0)
            .CheckList(i => i.ItemPictures, _itemPictures) // Complains that Item on ItemPicture is null.
            .VerifyTheMappings();
    }

My mappings are defined as:

public ItemMap()
    {
        Table("Item");
        Id(i => i.ItemID).GeneratedBy.Identity().Column("Item_id");
        Map(i => i.ItemNo).Nullable().Length(30);
        Map(i => i.Title).Not.Nullable().Length(250);
        Map(i => i.Description).Nullable();
        Map(i => i.SalesPrice).Not.Nullable().Precision(18);
        Map(i => i.AverageRating).Precision(18).Nullable();
        Map(i => i.Visible).Not.Nullable();
        Map(i => i.Weight).Not.Nullable().Precision(18);
        Map(i => i.TimesPurchased);
        Map(i => i.InStock).Not.Nullable();
        Map(i => i.DateAdded).Not.Nullable();
        HasManyToMany(i => i.ItemCategories).Cascade.All().Inverse().Table("ItemCategoryItem");
        HasMany(i => i.ItemPictures).Cascade.AllDeleteOrphan().Inverse().LazyLoad();
        HasMany(i => i.Comments).Cascade.AllDeleteOrphan().Inverse().LazyLoad();
        HasMany(i => i.Ratings).Inverse().LazyLoad();
    }

public ItemPictureMap()
    {
        Table("ItemPicture");
        Id(i => i.ItemPictureID).GeneratedBy.Identity().Column("ItemPicture_id");
        Map(i => i.Title).Nullable();
        Map(i => i.Filename).Not.Nullable();
        Map(i => i.PrimaryPicture).Not.Nullable();
        References(i => i.Item).Not.Nullable().Column("Item_id");
    }

I really can't understand how I can populate the Item ItemPicture property when using the PersistenceSpecification class.

Any ideas?

Best regards, Kenneth, Denmark

Answer 1

, ItemPicture , ( Fluent: http://wiki.fluentnhibernate.org/Persistence_specification_testing - . .)

Try:

[TestMethod]
public void CanMapItem()
{
    var p1 = new ItemPicture { Filename = "test.jpg", Title = "Test title", PrimaryPicture = true};
    var p2 =  new ItemPicture { Filename = "test2.jpg", Title = "Test title 2" };
    using (var tx = Session.BeginTransaction())
    {
        Session.Save(p1);
        Session.Save(p2);
    };
    new PersistenceSpecification<Item>(Session)
        .CheckProperty(i => i.Title, "Test item")
        .CheckProperty(i => i.Description, "Test description")
        .CheckProperty(i => i.SalesPrice, (decimal)0.0)
        .CheckList(i => i.ItemPictures, new List<ItemPicture> {p1, p2});
        .VerifyTheMappings();
}

Answer 2

CheckList, , . , , . CheckComponentList, Item , ItemPictures .

Answer 3

GetHashCode Equals IEqualityComparer. , , .

DateTime, , , , datetime1!= datetime2, , . , . , ItemPictures, IEqualityComparer, , , ItemPicture, , ItemPicture ItemPicture.Id. , :

[TestMethod]
public void CanMapItem()
{
    new PersistenceSpecification<Item>(Session, new CustomIEqualityComparer())
        .CheckProperty(i => i.Title, "Test item")
        .CheckProperty(i => i.Description, "Test description")
        .CheckProperty(i => i.SalesPrice, (decimal)0.0)
        .CheckList(i => i.ItemPictures, _itemPictures) // Complains that Item on ItemPicture is null.
        .VerifyTheMappings();
}


public class CustomIEqualityComparer: IEqualityComparer
{
    public bool Equals(object x, object y)
    {
        if (x == null || y == null)
        {
            return false;
        }
        if (x is ItemPicture && y is ItemPicture)
        {
            return ((ItemPicture) x).Id == ((ItemPicture) y).Id;
        }
        if(x is DateTime && y is DateTime)
        {
            return ((DateTime)x).Year ==((DateTime)y).Year;
        }
        return x.Equals(y);
    }

    public int GetHashCode(object obj)
    {
        throw new NotImplementedException();
    }
}