Hi, I'm pretty new at ORM solutions and granted I could have
completely misunderstood something here, but I've been struggling with
this for a while and can't seem to get anywhere with it.
In my class Case I have an IDictionary with Entity (a class) as key
and Roles (an enum) as value. When trying to save a new instance (non-
persisted) of Case, where the IDictionary is filled with new instances
of Entity I get the following error:
NHibernate.TransientObjectException: object references an unsaved
transient instance - save the transient instance before flushing.
Type: Entity
These are the classes (Roles is an enum):
public class Case
{
public Case { EntityCollection = new Dictionary<Entity, Roles>
(); }
public virtual int Id { get; set; }
public virtual IDictionary<Entity, Roles> EntityCollection { get;
set; }
}
and
public class Entity
{
public virtual int Id { get; set; }
}
And mapping is as follows:
<class name="Case" table="[Case]">
<id name="Id" column="Id" type="Int32" unsaved-value="any">
<generator class="hilo"/>
</id>
<map name="EntityCollection" table="CaseEntityRoles"
cascade="save-update" lazy="false" inverse="false">
<key column="CaseId" />
<index-many-to-many class="Entity"
column="EntityId" />
<element column="Roles" type="Roles" not-null="true" />
</map>
</class>
and
<class name="Entity" table="[Entity]">
<id name="Id" column="Id" type="Int32" unsaved-value="0">
<generator class="hilo"/>
</id>
</class>
Sample of the test code:
[Test]
public void Can_add_new_case()
{
var newCase = new Case();
newCase.EntityCollection.Add(new Entity(), Roles.Role1);
newCase.EntityCollection.Add(new Entity(), Roles.Role2);
/* At which point I try to persist newCase and get an exception */
}
In the testcode the newCase-instance is persisted, but the new
entities are not. I've tried a lot of different things, like adding a
<version> tag to Entity and messing around with unsaved-value, but
nothing seems to help. And as you can see from the mapping I do have
cascade="save-update".
The only solution I've found thus far is to loop over and explicitly
save the entities in my Case repository class, but I'm not satisfied
with this solution. Any ideas?
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