rails/jbuilder — pull request #151 by aaronlifton (2013-10-23 19:13:30+00:00)
Title: Enable multiple top-level json arrays

### Exhibit A.

json.array! [@foo, @bar] do |json, thing|
json.title = thing.is_a?(Thing) "derp thing" : "not a thing"
json.description thing.description
json.url some_polymorphic_url(thing)
end