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

From Rails 5.2 onwards, the current accepted answer is no longer be valid, and passing a string to the conditional will fail.

DEPRECATION WARNING: Passing string to :if and :unless conditional options is deprecated and will be removed in Rails 5.2 without replacement.

Going forward, a proc is now the best way to add a conditional like in the original question:

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