Databases
StackOverflow2013
Postsdbo
POUnmapped property in a mapped class (Fluent NHibernate 1.1)
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POUnmapped property in a mapped class (Fluent NHibernate 1.1)
    primarykey
    data
    text
    <h2>Background</h2> <p>Fluent NHibernate 1.1 (with a repository implementation using LINQ to NHibernate) in an ASP.NET MVC 2 project using Ninject.</p> <p>I have a mapped class (<code>Station</code>) with a collection of another mapped class (<code>Report</code>). I would also like <code>Station</code> to have a convenience property (<code>MostRecentReport</code>) that returns the <code>Report</code> for that <code>Station</code> with the most recent timestamp.</p> <h2>Partial Schema</h2> <pre><code>Stations -------- Id Reports --------- Id StationId Timestamp </code></pre> <h2>Partial Code</h2> <pre><code>public abstract class Entity { public virtual int Id { get; private set; } } public class Station : Entity { public virtual IList&lt;Report&gt; Reports { get; private set; } public Station() { Reports = new List&lt;Report&gt;(); } } public class Report : Entity { public virtual Station Station { get; set; } public virtual DateTime Timestamp { get; set; } } public StationMap : ClassMap&lt;Station&gt; { public StationMap() { Id(s =&gt; s.Id); HasMany&lt;Report&gt;(s =&gt; s.Reports) .Table("Reports") .KeyColumn("StationId"); } } public ReportMap : ClassMap&lt;Report&gt; { public ReportMap() { Id(r =&gt; r.Id); References&lt;Station&gt;(r =&gt; r.Station, "StationId"); Map(r =&gt; r.Timestamp); } } </code></pre> <p>I naively tried adding an unmapped property that returned <code>Reports.OrderByDescending(r =&gt; r.Timestamp).FirstOrDefault()</code> but that causes "could not resolve property: MostRecentReport" <code>NHibernate.QueryException</code>s (even though I am not using auto mapping). I also tried implementing it as a method with identical return, but that causes "Index was out of range" exceptions.</p> <p>Is there a way to make it work with either the property (preferable) or method approach? Or is there some way to map it with <code>Formula()</code>, perhaps?</p> <h2>Update</h2> <p>Fluent NHibernate configuration (occurs in my <code>NinjectModule</code> implementation's <code>Load</code> override):</p> <pre><code>ISessionFactory sessionFactory = Fluently.Configure() .Database(MsSqlConfiguration.MsSql2008.ConnectionString(Settings.ConnectionString)) .Mappings(m =&gt; m.FluentMappings.AddFromAssemblyOf&lt;Domain.Station&gt;()) .BuildSessionFactory(); </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USLobstrosity
    1. USLobstrosity
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POUnmapped property in a mapped class (Fluent NHibernate 1.1)
      1. This table or related slice is empty.
      1. VTUpMod
    1. COLet us see the code where you configure NHibernate. An automap might be lurking somewhere.
      singulars
      1. POUnmapped property in a mapped class (Fluent NHibernate 1.1)
      1. USrebelliard
    2. COUpdated question with Fluent NHibernate configuration.
      singulars
      1. POUnmapped property in a mapped class (Fluent NHibernate 1.1)
      1. USLobstrosity
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload