TypeError when issuing destroyRecord on hasMany items on model

Ember Info

Ember Version: 2.8.3

Ember Data Version: 2.8.1

Broken Code

I am getting an error when iterating through a hasMany relationship on an Ember-data model.

TypeError: Cannot read property 'get' of undefined

Here is the code that is getting the error:

question.get('question-options').then(options => {
  options.forEach(option => {
    option.destroyRecord();
  });
});
question.set('kind', target.value);

A little background on the code. The question has a type and we remove the associated question-options when changing the type. In reality this is only happening to non-persisted questions (no id present).

In the above code if I replace option.destroyRecord() with console.log(option.get('text')). Things work fine.

I can also get things to work they way I want them to by adding toArray() before the forEach. This is what I'm doing as a work-around but I wanted to see if anyone had any ideas why it was behaving this way.

Working Code with toArray()

question.get('question-options').then(options => {
  options.toArray().forEach(option => {
    option.destroyRecord();
  });
});
question.set('kind', target.value);