I haven't had much time to investigate on this,
but I think I spotted a bug/problem.

When you describe a model -> model assosiaction (hasMany / hasOne) the getters/setters are not correctly placed.

This occurs with extjs 4.1.x

It *might* be a loading time issue or just a glitch.

If you don't explicitly define a setter/getter you end up with this:

ownerProto[getterName] = me.createGetter();
ownerProto[setterName] = me.createSetter();

where getterName and setterName are:

while it should be

this can either be fixed at architect level or extjs level...
as long as there is consistency...