Hi i'm having a problem mapping entities that references other
entities that have a ID of type string.
The schemas for 3 tables, school references school system and that
references county:
School (
School_Id INTEGER primary key,
Name TEXT,
SchoolSystem_id INTEGER not null foreign key
)
SchoolSystem(
SchoolSystem_Id INTEGER primary key,
County_Name TEXT not null foreign key,
)
County (
County_Name TEXT not null primary key,
County_Number INTEGER not null,
)
-------------------------------------------------------------
Mapping classes:
public class CountyMap : ClassMap<County>
{
public CountyMap()
{
WithTable("County");
Id(x => x.Name, "County_Name");
Map(x => x.Number, "County_Number").Not.Nullable();
}
}
public class SchoolSystemMap : ClassMap<SchoolSystem>
{
public SchoolSystemMap()
{
WithTable("SchoolSystem");
Id(x => x.Id, "School_System_ID");
References(x => x.County, "County_Name").Not.Nullable()
.WithForeignKey("County_Name").FetchType.Join
().Cascade.All();
}
}
public class SchoolMap : ClassMap<School>
{
public SchoolMap()
{
WithTable("School");
Id(x => x.Id, "School_ID");
Map(x => x.Name, "School_Name");
References(x => x.SchoolSystem, "School_System_ID").Not.Nullable
()
.WithForeignKey("School_System_ID").FetchType.Join
().Cascade.All();
}
}
-----------------------------------------------------------------------------
And the entities:
public class County
{
public virtual string Name { get; set; }
public virtual int Number { get; set; }
}
public class SchoolSystem
{
public virtual int Id { get; set; }
public virtual County County { get; set; }
}
public class School
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual SchoolSystem SchoolSystem { get; set; }
}
---------------------------------------------------------------
Testing the mappings for County works:
new PersistenceSpecification<County>(session)
.CheckProperty(s => s.Name, "Thurston")
.CheckProperty(s => s.Number, 10)
.VerifyTheMappings();
Testing mapping for SchoolSystem fails:
new PersistenceSpecification<SchoolSystem>(session)
.CheckProperty(p => p.County, new County {Name = "SomeCounty",
Number = 10})
.VerifyTheMappings();
It throws an error. And it looks like it is because it is expecting
an insert instead of an update on County so it throws an exception:
INSERT INTO SchoolSystem (County_Name) VALUES (@p0); select
last_insert_rowid();
UPDATE luCounty SET County_Number = @p0 WHERE County_Name = @p1;
NHibernate.StaleStateException: Unexpected row count: 0; expected: 1.
---------------------------------------------------------------
Here are a few things i've tried.
I removed the county name from the test to try to get an insert.
new PersistenceSpecification<SchoolSystem>(session)
.CheckProperty(p => p.County, new County { Number = 10})
.VerifyTheMappings();
and get the exception:
NHibernate.Id.IdentifierGenerationException: ids for this class
must be manually assigned before calling save
So I tried to change the mapping of the CountyMap Id to be
GeneratedBy.Assigned and GeneratedBy.Identity but couldn't get my
mapping test to pass either. It works ok if i do not have the id as
type string but it is a string in the database so i dont think that
helps me any.
I'm out of ideas, am i doing something wrong. Any help would be
great. Thanks.
I also had a side question. I played around in making my domain
objects inherit from the fluent nhibernate Entity but that adds an
extra id to my db table schema, i don't quite understand how that
works.
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