Reduce duplication when generating translations

1 files changed, 40 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..b626dfab3b
--- /dev/null
+++ b/actionview/lib/action_view/helpers/tags/translator.rb
@@ -0,0 +1,40 @@
+module ActionView
+  module Helpers
+    module Tags # :nodoc:
+      class Translator # :nodoc:
+        attr_reader :object, :object_name, :method_and_value, :i18n_scope
+
+        def initialize(object, object_name, method_and_value, i18n_scope)
+          @object = object
+          @object_name = object_name.gsub(/\[(.*)_attributes\]\[\d+\]/, '.\1')
+          @method_and_value = method_and_value
+          @i18n_scope = i18n_scope
+        end
+
+        def call
+          placeholder ||= I18n.t("#{object_name}.#{method_and_value}", :default => i18n_default, :scope => i18n_scope).presence
+          placeholder || human_attribute_name
+        end
+
+        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
+
+        def model
+          @model ||= object.to_model if object.respond_to?(:to_model)
+        end
+      end
+    end
+  end
+end