app/assets/javascripts/components/autocomplete.js.coffee
App.components.autocomplete = ->
attributes: ->
target: $("##{@attr.name}-autocomplete")
initialize: ->
@container.autocomplete
minLength: 2
source: @attr.url
select: @onSelect.bind(this)
onSelect: (event, ui) ->
value = ui.item?.id || ""
target = @attr.target
target.val(value)
target.trigger 'change'