Specifying custom encoder via block doesn't work.

[Anton Semenov]

I can't change encoder to provide support with the ActiveModel::Serializers gem.

This feature described in README, but doesn't work:

json encoder

Autocomplete uses Yajl as JSON encoder/decoder, but you can specify your own

class ProductsController < Admin::BaseController
  autocomplete :brand, :name do |items|
     CustomJSON::Encoder.encode(items)
  end
end