I18n integration about action_policy HOT 7 CLOSED

def full_message(policy_class, rule)
  # generate candidates
  candidates = [:"policy.#{policy_class.identifier}.#{rule}"]

  # then we have to populate candidates taking into account superclasses
  # and probably namespaces

  candidates << ...
  
  # then add global fallbacks
  candidates << :"policy.#{rule}" # e.g. "action_policy.policy.index?"
  candidates << :default_message

  I18n.t(
    candidates.shift,
    default: candidates,
    scope: [:action_policy]
  )
end

ActionPolicy::Unauthorized.include(Module.new do
  def message
    ActionPolicy::I18n.full_message(policy, rule)
  end
end)

ActionPolicy::Policy::FailureReasons.include(Module.new do
  def full_messages
    reasons.flat_map do |policy_klass, rules|
      rules.map { |rule| ActionPolicy::I18n.full_message(policy_klass, rules) }
    end
  end
end)

# having such policies
class UserPolicy < ActionPolicy::Base
  def index?; end
end

class GuestPolicy < UserPolicy; end

class Admin::UserPolicy < UserPolicy; end

class Admin::GuestPolicy < Admin::UserPolicy; end

# the lookup candidates should be

# for UserPolicy
["user.index?"]

# for GuestPolicy
["guest.index?", "user.index?"]

# for Admin::UserPolicy
["admin/user.index?", "user.index?"]

# for Admin::GuestPolicy
["admin/guest.index?", "admin/user.index?", "guest.index?", "user.index?"]

# in config/application.rb
config.i18n.load_path += Dir[
  Rails.root.join('config', 'locales', '**', '*.{yml,rb}').to_s
]