Add (back) rails-level JSON caching (#11333)

app/controllers/application_controller.rb

@@ -10,6 +10,7 @@ class ApplicationController < ActionController::Base
   include Localized
   include UserTrackingConcern
   include SessionTrackingConcern
+  include CacheConcern
 
   helper_method :current_account
   helper_method :current_session
@@ -115,47 +116,10 @@ class ApplicationController < ActionController::Base
     current_user.setting_theme
   end
 
-  def cache_collection(raw, klass)
-    return raw unless klass.respond_to?(:with_includes)
-
-    raw                    = raw.cache_ids.to_a if raw.is_a?(ActiveRecord::Relation)
-    cached_keys_with_value = Rails.cache.read_multi(*raw).transform_keys(&:id)
-    uncached_ids           = raw.map(&:id) - cached_keys_with_value.keys
-
-    klass.reload_stale_associations!(cached_keys_with_value.values) if klass.respond_to?(:reload_stale_associations!)
-
-    unless uncached_ids.empty?
-      uncached = klass.where(id: uncached_ids).with_includes.each_with_object({}) { |item, h| h[item.id] = item }
-
-      uncached.each_value do |item|
-        Rails.cache.write(item, item)
-      end
-    end
-
-    raw.map { |item| cached_keys_with_value[item.id] || uncached[item.id] }.compact
-  end
-
   def respond_with_error(code)
     respond_to do |format|
       format.any  { head code }
       format.html { render "errors/#{code}", layout: 'error', status: code }
     end
   end
-
-  def render_cached_json(cache_key, **options)
-    options[:expires_in] ||= 3.minutes
-    cache_public           = options.key?(:public) ? options.delete(:public) : true
-    content_type           = options.delete(:content_type) || 'application/json'
-
-    data = Rails.cache.fetch(cache_key, { raw: true }.merge(options)) do
-      yield.to_json
-    end
-
-    expires_in options[:expires_in], public: cache_public
-    render json: data, content_type: content_type
-  end
-
-  def set_cache_headers
-    response.headers['Vary'] = public_fetch_mode? ? 'Accept' : 'Accept, Signature'
-  end
 end