问题
I am puzzled and frustrated by an exception I'm getting via NHibernate. I apologize for the length of this post, but I've tried to include an appropriate level of detail to explain the issue well enough to get some help!
Here's the facts:
- I have a
Person
class which contains a propertyBillingManager
, which is also aPerson
type. I map this as an FNH "Reference". - I have an
ExpenseReport
class which contains a propertySubmittedBy
, which is aPerson
type. I map this as an FNH "Reference". - I have a
BillableTime
class which contains a propertyPerson
, which is aPerson
type. I map this as an FNH "Reference". Person
contains a collection (IList) ofExpenseReport
types (propertyExpenseReports
)Person
contains a collection (IList) ofBilledTime
types (propertyTime
)
(See classes and mappings at bottom of post.)
All was cool until I added the IList<BilledTime> Time
collection to Person
. Now, when I try to access _person.Time
, I get an exception:
The code:
// Get billable hours
if (_person.Time == null ||
_person.Time.Count(x => x.Project.ProjectId == project.ProjectId) == 0)
{
// No billable time for this project
billableHours = Enumerable.Repeat(0F, 14).ToArray();
}
The exception:
could not initialize a collection:
[MyApp.Business.Person.Time#211d3567-6e20-4220-a15c-74f8784fe47a]
[SQL: SELECT
time0_.BillingManager_id as BillingM8_1_,
time0_.Id as Id1_,
time0_.Id as Id1_0_,
time0_.ReadOnly as ReadOnly1_0_,
time0_.DailyHours as DailyHours1_0_,
time0_.Week_id as Week4_1_0_,
time0_.Person_id as Person5_1_0_,
time0_.Project_id as Project6_1_0_,
time0_.Invoice_id as Invoice7_1_0_
FROM [BillableTime] time0_
WHERE time0_.BillingManager_id=?]
It's true that BillingManager_id
is an invalid column name, it doesn't exist in the BillableTime
table. However, I don't understand why NHB has created this SQL... doesn't make sense to me. I have seen this "Invalid column name" exception a lot when searching for a solution, but nothing seems to work. Even more confusing: like BilledTime
, the ExpenseReport
type also contains a reference to Person
and it works perfectly.
One thing I was able to figure out is that if I remove the BillingManager reference from the Person mapping (References(p => p.BillingManager)
), the exception goes away and things seem to work (with respect to BillableTime; it of course breaks the BillingManager persistence). Now it seems like there is some "self-reference" problem, since the Person.BillingManager
property is itself a reference to a Person
.
Any idea what is going on here? I'm at a loss...
Thanks.
=== Classes & Mappings ===
public class Person
{
public virtual string LastName { get; set; }
public virtual string FirstName { get; set; }
public virtual Person BillingManager { get; set; }
public virtual IList<ExpenseReport> ExpenseReports { get; set; }
public virtual IList<BillableTime> Time { get; set; }
}
public class PersonMapping : ClassMap<Person>
{
public PersonMapping()
{
Id(p => p.UserId).GeneratedBy.Assigned();
Map(p => p.LastName).Not.Nullable();
Map(p => p.FirstName).Not.Nullable();
References(p => p.BillingManager);
HasMany(p => p.ExpenseReports).Cascade.AllDeleteOrphan();
HasMany(p => p.Time).Cascade.AllDeleteOrphan();
}
}
public class BillableTime
{
public virtual int Id { get; private set; }
public virtual Week Week { get; set; }
public virtual Person Person { get; set; }
public virtual Project Project { get; set; }
public virtual float[] DailyHours { get; set; }
public virtual Invoice Invoice { get; set; }
public virtual bool ReadOnly { get; set; }
}
public class BillableTimeMapping : ClassMap<BillableTime>
{
public BillableTimeMapping()
{
Id(x => x.Id);
References(x => x.Week);
References(x => x.Person);
References(x => x.Project);
References(x => x.Invoice);
Map(x => x.ReadOnly).Not.Nullable().Default("0");
Map(x => x.DailyHours).Length(28);
}
}
public class ExpenseReport
{
public virtual long Id { get; set; }
public virtual Person SubmittedBy { get; set; }
}
回答1:
the following line should solve the issue, but i' dont know exactly why it is happening. if i have the spare time i will investigate.
HasMany(p => p.Time).Cascade.AllDeleteOrphan().KeyColumn("Person_Id");
来源:https://stackoverflow.com/questions/7681928/nhibernate-exception-could-not-initialize-a-collection-invalid-column-name-fl