Is “proc” required with conditional before_action/before_filter?

Question

Behold, a before_filter:

class ThingController < ApplicationController
  before_filter :check_stuff, :if => proc {Rails.env.production?}
end
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Answer 1

I would recommend using staby lambda. If you want know, WHY? Please read this

class ThingController < ApplicationController
  before_action :check_stuff, if: -> { Rails.env.production? }
end

which is almost equivalent to Upvote Me's answer.