Class-level helper for lazy translations

CHANGELOG.md

@@ -16,6 +16,7 @@
 - __Breaking change__. Drop `.context_handler`, `.context_to_action!` methods.
   Use pass action name directly to `#save_context`.
   It's the same as `.context_to_action!` is enabled by default.
+- Class-level helper for lazy translations.
 
 # 0.13.1
 

lib/telegram/bot/updates_controller/translation.rb

@@ -8,6 +8,17 @@ module Telegram
       #
       # To disable this behaviour use `alias_method :action_name_i18n_key, :action_name`.
       module Translation
+        extend ActiveSupport::Concern
+
+        module ClassMethods
+          # Class-level helper for lazy translations.
+          def translate(key, options = {})
+            key = "#{controller_path.tr('/', '.')}#{key}" if key.to_s.start_with?('.')
+            I18n.translate(key, options)
+          end
+          alias :t :translate
+        end
+
         # See toplevel description.
         def translate(key, options = {})
           if key.to_s.start_with?('.')

spec/telegram/bot/updates_controller/translation_spec.rb

@@ -14,4 +14,18 @@ RSpec.describe Telegram::Bot::UpdatesController::Translation do
       controller.t('.hello')
     end
   end
+
+  describe described_class::ClassMethods do
+    describe '#translate' do
+      let(:controller_class) do
+        double(controller_path: 'telegram/webhooks').
+          tap { |x| x.extend(described_class) }
+      end
+
+      it 'uses controller_path for lazy translations' do
+        expect(I18n).to receive(:translate).with('telegram.webhooks.hello', {})
+        controller_class.t('.hello')
+      end
+    end
+  end
 end