Question

We have a situation where we want to define a relationship where a class (named Module) may or may not be related to a Module object that is a predecessor to it. There can be zero or none predecessors. The class looks like this:

public class Module {     public int Id     {         get;         set;     }      // other stuff here      public Module Predecessor     {         get;         set;     } } 

And we have defined our mapping so that Predecessor is a property of type Module like so:

<class name='Module'>     <Id name='Id'>         <generator class='native/>     </Id     <property name='Predecessor' type='Module' 'unique='true'/> <class> 

However we are getting complaints about the mapping not being able to compile because it cannot find the type ‘Module’. We have tried the long name for the class

type='STC.EI.JobSubmissionSystem.Data.Domain' 

and the fully-qualified name for the class

type='STC.EI.JobSubmissionSystem.Data.Domain, STC.EI.JobSubmissionSystem.Data' 

to no avail. My question is:

Are we mapping this properly, and if not then how do we map it properly?

Answer 1

You could use the many-to-one element:

<class name='Module'>     <Id name='Id'>         <generator class='native'/>     </Id>     <many-to-one name='Predecessor' class='Module' column='predecessor_id' /> <class> 

Note that you need a column in your table to define the relation.