1 files changed, 39 insertions, 0 deletions
diff --git a/actionview/lib/action_view/helpers/tags/translator.rb b/actionview/lib/action_view/helpers/tags/translator.rb
new file mode 100644
index 0000000000..e81ca3aef0
--- /dev/null
+++ b/actionview/lib/action_view/helpers/tags/translator.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module ActionView
+  module Helpers
+    module Tags # :nodoc:
+      class Translator # :nodoc:
+        def initialize(object, object_name, method_and_value, scope:)
+          @object_name = object_name.gsub(/\[(.*)_attributes\]\[\d+\]/, '.\1')
+          @method_and_value = method_and_value
+          @scope = scope
+          @model = object.respond_to?(:to_model) ? object.to_model : nil
+        end
+
+        def translate
+          translated_attribute = I18n.t("#{object_name}.#{method_and_value}", default: i18n_default, scope: scope).presence
+          translated_attribute || human_attribute_name
+        end
+
+        private
+          attr_reader :object_name, :method_and_value, :scope, :model
+
+          def i18n_default
+            if model
+              key = model.model_name.i18n_key
+              ["#{key}.#{method_and_value}".to_sym, ""]
+            else
+              ""
+            end
+          end
+
+          def human_attribute_name
+            if model && model.class.respond_to?(:human_attribute_name)
+              model.class.human_attribute_name(method_and_value)
+            end
+          end
+      end
+    end
+  end
+end