Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Try using the overloaded PersistenceSpecification constructor that takes an IEqualityComparer to compare the child objects (AssociatedGuardian, AssociatedStudent). The persistence specification test compares two different references (original and retrieved), so they will have different hash codes with your implementation. As I understand it, comparisons made using an IEqualityComparer firsts compare the hash codes then check Equals if the hash code matches. My guess is that PersistenceSpecification is wrapping the Equals call in an IEqualityComparer implementation.</p> <p>I use a utility class to make this easier:</p> <pre><code>public class PersistenceSpecificationEqualityComparer : IEqualityComparer { private readonly Dictionary&lt;Type, Delegate&gt; _comparers = new Dictionary&lt;Type, Delegate&gt;(); public void RegisterComparer&lt;T&gt;(Func&lt;T, object&gt; comparer) { _comparers.Add(typeof(T), comparer); } public bool Equals(object x, object y) { if (x == null || y == null) { return false; } var xType = x.GetType(); var yType = y.GetType(); // check subclass to handle proxies if (_comparers.ContainsKey(xType) &amp;&amp; (xType == yType || yType.IsSubclassOf(xType))) { var comparer = _comparers[xType]; var xValue = comparer.DynamicInvoke(new[] {x}); var yValue = comparer.DynamicInvoke(new[] {y}); return xValue.Equals(yValue); } return x.Equals(y); } public int GetHashCode(object obj) { throw new NotImplementedException(); } } </code></pre> <p>Usage:</p> <pre><code>var comparer = new PersistenceSpecificationEqualityComparer(); comparer.RegisterComparer((Guardian x) =&gt; x.Id); comparer.RegisterComparer((Student x) =&gt; x.Id); // etc. new PersistenceSpecification&lt;StudentGuardianAssociation&gt;(Session, comparer) .CheckProperty(x =&gt; x.RelationShipToStudent, 1) .CheckReference(x =&gt; x.AssociatedStudent, student) .CheckReference(x =&gt; x.AssociatedGuardian, guardian) .VerifyTheMappings(); </code></pre> <p>EDIT:</p> <p>I think I see the problem: guardian and student are not persisted in the session and there's no cascade that would do it automatically. Saving those objects before running the PersistenceSpecification should fix it. You can see the code for the CheckValue method in <a href="https://stackoverflow.com/questions/1776120/fluent-nhibernate-persistencespecification-component-and-reference-tests">this answer</a>. In looking at your question again, the error message states "but got '' of type 'Pats.DataTransfer.Student'" indicating that the value is null.</p> <p>Assuming that's the solution, I am curious if you still need the IEqualityComparer. Profiling using a tool such as <a href="http://nhprof.com/" rel="nofollow noreferrer">NHProf</a> would have caught this quickly because you would see the nulls in the insert.</p>
    singulars
    1. This table or related slice is empty.
    1. POUnit Testing Fluent NHibernate. Need help understanding an exception that occurs during a test
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USJamie Ide
    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. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThank you for your input. I added the custom comparer to my tests project and used the overload for PersistenceSpecification that utilized it. But unfortunately, it did not resolve the exception. If I place break points in GetHashCode, and Equals in my base class, they are never hit. So the exception is being thrown prior to the equality check. I think it is when the Student object is being added to database, but it's hard to say, as CheckReference does so much, adding the object to the database, and retrieving it again, and then comparing the instances.
      singulars
      1. PO
      1. USMatthew Vines
    2. COI added the stack trace information to my question. Unfortunately, it doesn't give me any insights into where to look for this. But I have only been experimenting with nhibernate for a few days now.
      singulars
      1. PO
      1. USMatthew Vines
    3. COSee the edit to my answer, hopefully it's right (this time).
      singulars
      1. PO
      1. USJamie Ide
 

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