From be48a6c295691d8a8dc288ecc89aa444f6440755 Mon Sep 17 00:00:00 2001
From: Matt-Yorkley <9029026+Matt-Yorkley@users.noreply.github.com>
Date: Sun, 30 Apr 2023 00:36:17 +0100
Subject: [PATCH] Implement cache_with_locale helper for fragment caching with
 locales

---
 app/helpers/application_helper.rb | 16 ++++++++++++++++
 config/application.rb             |  6 ++++++
 2 files changed, 22 insertions(+)

diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index afefbf5bf5..5d493c5a32 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -68,4 +68,20 @@ module ApplicationHelper
       wicked_pdf_stylesheet_pack_tag(source)
     end
   end
+
+  def cache_with_locale(key = nil, options = {}, &block)
+    cache(cache_key_with_locale(key, I18n.locale), options) do
+      yield(block)
+    end
+  end
+
+  def cache_key_with_locale(key, locale)
+    Array.wrap(key) + [locale.to_s, locale_digest(locale)]
+  end
+
+  private
+
+  def locale_digest(locale)
+    Rails.application.config.x.i18n_digests[locale]
+  end
 end
diff --git a/config/application.rb b/config/application.rb
index 101a35e2e2..943cc05474 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -184,6 +184,12 @@ module Openfoodnetwork
     config.i18n.available_locales = OpenFoodNetwork::I18nConfig.available_locales
     I18n.locale = config.i18n.locale = config.i18n.default_locale
 
+    # Calculate digests for locale files so we can know when they change
+    config.i18n.available_locales.each do |locale|
+      (config.x.i18n_digests ||= {})[locale.to_sym] =
+        Digest::MD5.hexdigest(File.read(Rails.root.join("config/locales/#{locale}.yml")))
+    end
+
     # Setting this to true causes a performance regression in Rails 3.2.17
     # When we're on a version with the fix below, we can set it to true
     # https://github.com/svenfuchs/i18n/issues/230