[d_k_f]

They're likely taking about being able to query for additional data from the view layer. Rails makes this very easy since you often simply pass along query results to the view, which are "database connected" ActiveRecord instances. This way you can easily build the infamous "iterate over Posts and show their Users" N+1 example.

According to them, other frameworks require you to fetch all required data before passing it to the view layer, thus preventing this issue from coming up on the first place.