c# - How to enable lazy loading of relations after INSERT in NHibernate -

i have 1 many relationship between 2 entities in nhibernate:

public class application {     public string taskid { get; set; } // foreign key reference     public task task { get; set; }     // relation/navigation property } 

the db.web.applications.create method calls "saveorupdate" method of nhibernate session inside transaction.

the relavant mappings:

internal class applicationmap : classmap<application> {     public applicationmap() : base()     {         schema(...);         table(...);          compositeid()             .keyproperty(app => app.userid, "...")             .keyproperty(app => app.taskid, "task_id")             .keyproperty(app => app.transactionid, "...");          // relations          references(app => app.task, "task_id")             .foreignkey("taskid")             .unique()             .not.insert()             .cascade.persist();     } }  internal class taskmap : classmap<task> {     public taskmap()     {         schema(..);         table(...);          id(task => task.id, "task_id");          hasmany(task => task.applications)             .keycolumn("task_id");     } } 

when wrote test against real database create new application found navigation property not lazy loading after insert:

var app = new application(...) {     taskid = "..." };  db.web.applications.create(app); db.savechanges();  var actual = db.web.applications.find(app.userid, app.taskid, app.transactionid);  // actual.task null 

the mappings working expect, after inserting new application object, accessing task property returns null instead of lazy loading entity database. can done, , if so, how?

i think problem comes in way you've mapped application class , it's corresponding task object relation. think should map instead:

public class application {     public task task { get; set; }     // relation/navigation property }  internal class applicationmap : classmap<application> {     public applicationmap() : base()     {         schema(...);         table(...);          compositeid()             .keyproperty(app => app.userid, "...")             .keyreference(app => app.task, "task_id")             .keyproperty(app => app.transactionid, "...");     } }  internal class taskmap : classmap<task> {     public taskmap()     {         schema(..);         table(...);          id(task => task.id, "task_id");          hasmany(task => task.applications)             .keycolumn("task_id");     } } 

there no need map specific id property foreign key relationships. map entity only. it's easier way. code above insertion this:

var app = new application(...) {     task = session.load<task>(taskid) };  db.web.applications.create(app); db.savechanges();  var actual = db.web.applications.find(app.userid, app.taskid, app.transactionid);