Thanks, I'm building Angular.js app and adopting Rails 4 for api backend, Will Rails-API be updated for Rails 4 ?

It should work today. If it does not, it's a bug.

By the way, ActiveModel::Serializers is part of the Rails API project[1], and we'd love some thoughts on how to make it work well with Angular.

1: https://github.com/rails-api/active_model_serializers

The only issue that's been biting me when using ActiveModel::Serializers and AngularJS is that we must manually return the json with the root: false option set, otherwise the AngularJS $resource provider doesn't work correctly.

If it helps you can make that the default for all your serializers, by doing something like this in an initializer:

    ActiveSupport.on_load(:active_model_serializers) do
      ActiveModel::ArraySerializer.root = false
      ActiveModel::Serializer.root = false
    end

Looks like it already is: https://news.ycombinator.com/item?id=5940484

Wow that looks great. Are there any benchmarks as to how much faster it is compared to a vanilla Rails app?

It's difficult to benchmark, to be honest: Rails apps depend on so many things, there are too many variables. I'd love to hear from some people who have tried it in their apps though!

I'm more interested in it as a place to explore best practices and work on useful things around names, than the speed aspects.