I am pretty new to nhibernate and have been tinkering more and more
lately. I've run into an issue with a <list /> mapping.
Here is my mapping file (taken from the Customer -> Order -> LineItem)
example in the nhibernate docs
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="MyProject.Model" namespace="MyProject.Model">
<class name="Order" table="Orders">
<id name="Id">
<generator class="identity" />
</id>
<property name="OrderDate" />
<many-to-one name="Customer" column="CustomerId" />
<list name="OrderLineItems" table="OrderLineItems" lazy="true">
<key column="OrderId" />
<index column="OrderLineItemNumber" />
<composite-element class="OrderLineItem">
<property name="Quantity" column="Quantity" />
<many-to-one name="Product" column="ProductId" />
</composite-element>
</list>
</class>
</hibernate-mapping>
I see the appropriate SQL being run
NHibernate: SELECT order0_.Id as Id3_0_, order0_.OrderDate as
OrderDate3_0_, order0_.CustomerId as CustomerId3_0_ FROM Orders
order0_ WHERE order0_....@p0; @p0 = '1'
NHibernate: SELECT orderlinei0_.OrderId as OrderId0_,
orderlinei0_.Quantity as Quantity0_, orderlinei0_.ProductId as
ProductId0_, orderlinei0_.OrderLineItemNumber as OrderLin4
The second SELECT returns 2 rows which I would expect. But when I try
to iterate through the Order.OrderLineItems collection property there
are 3 in the collection. The first item is null.
I've got the follow property on my Order class
public virtual IEnumerable<OrderLineItem> OrderLineItems { get; set; }
I am unsure as to what I am missing here. Is an empty OrderLineItem
initialized?
Any help would be appreciated.
Thanks.
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