I have a has_and_belongs_to_many relations, let's call it :somethings.

There is a document in which :something_ids includes some ids that no longer exist in the related model (i.e. model.somethings.count is less than model.something_ids.count).

If I try to eager load it with Model.includes(:somethings), then it fails with undefined method `id' for nil:NilClass here

Might be fixed with a simple nil check on doc.