DataMapper ORM v1.8.2

[eluser]WanWizard[/eluser]
To start with the all_to_array() question: if you check the array extension, you'll see that the to_array() method checks both the has_one and has_many arrays to see if the property name is an related object. Perhaps you can debug that and see why it doesn't work?

A constructor should only be called when constructing the object, so you are right in that it should only be called once. However, internally an object is constructed for each record in the result, so it's logical that you will see a call to the constructor in get() operations, as new objects of your model are instantiated.

As for your last question, assuming that 'friend' is a related model, it will only exist if related objects have been fetched, which is never the case in a model constructor (as you haven't even fetched the record itself at that point).