Collection is Read-Only?

jhandel · **Posted:** Sun Feb 25, 2007 2:30 am

I'm using 1.2.0 CR1 and I am getting the oddest error when I try to do an Add to any of my bags.

Code:

System.NotSupportedException : Collection is read-only.
   at System.ThrowHelper.ThrowNotSupportedException(ExceptionResource resource)
   at System.Collections.ObjectModel.ReadOnlyCollection`1.System.Collections.Generic.ICollection<T>.Add(T value)
   at NHibernate.Collection.Generic.PersistentGenericBag`1.Add(T item)

Here is what my bag Maps look like

Code:

<bag name="LoginHistory" inverse="true" access="nosetter.camelcase-underscore" cascade="delete">
      <key column="UserFk"/>
      <one-to-many class ="UserLoginHistory"/>
    </bag >

here is what the actual property looks like..

Code:

  private IList<UserLoginHistory> _loginHistory = new List<UserLoginHistory>();

        public IList<UserLoginHistory> LoginHistory
        {
            get { return new ReadOnlyCollection<UserLoginHistory>(_loginHistory); }
        }

and here is what my add function looks like (all wrapped up so that child gets to know its parent :-)..)

Code:

   public void AddLoginHistory(UserLoginHistory history)
        {
            if (_loginHistory.Contains(history)) return;
            _loginHistory.Add(history); // < -- this is where the fails (and notice.. its the private IList not the public read only IList)
            if (history.User==null)
                history.User = this;
            else if (!history.User.Equals(this))
                history.User = this;
        }

Now I am fairly firmilar with 1.0.X NHibernate and have been using it for a while.. so I am trying to move forward to 1.2 and use generics but this just stumps me? Is it because inverse="true"? if so I am ok with that.. I just need to know how to force a refresh of my collections to reflect freshly added children.

Thanks in advance for the help :-)
Josh

mnichols · **Joined:** Mon Aug 21, 2006 9:18 am **Posts:** 179

Try changing your access to access="field.camelcase-underscore".
I'm curious, is the parent lazyloaded?

jhandel · **Posted:** Sun Feb 25, 2007 12:02 pm

I tested both lazy load and not lazy load with the same result. I just tried your suggestion (field accessor) and I could add to the collection so that worked.. I wonder why the other accessor didn't work?

Thanks
Josh

mnichols · **Joined:** Mon Aug 21, 2006 9:18 am **Posts:** 179

I am glad at least that worked. It is odd to me, too. I am going to try to do some tests on this because I am curious also.

Take care!