Provide preload method for last_notes

app/models/additionals_journal.rb

@@ -37,5 +37,30 @@ class AdditionalsJournal
 
       true
     end
+
+    # Preloads visible last notes for a collection of entity
+    # this is a copy of Issue.load_visible_last_notes, but usable for all entities
+    # @see https://www.redmine.org/projects/redmine/repository/entry/trunk/app/models/issue.rb#L1214
+    def load_visible_last_notes(entries, entity, user = User.current)
+      return unless entries.any?
+
+      ids = entries.map(&:id)
+
+      journal_class = (entity == Issue ? Journal : "#{entity}Journal").constantize
+      journal_ids = journal_class.joins(entity.name.underscore.to_sym => :project)
+                                 .where(journalized_type: entity.to_s, journalized_id: ids)
+                                 .where(journal_class.visible_notes_condition(user, skip_pre_condition: true))
+                                 .where.not(notes: '')
+                                 .group(:journalized_id)
+                                 .maximum(:id)
+                                 .values
+
+      journals = Journal.where(id: journal_ids).to_a
+
+      entries.each do |entry|
+        journal = journals.detect { |j| j.journalized_id == entry.id }
+        entry.instance_variable_set('@last_notes', journal.try(:notes) || '')
+      end
+    end
   end
 end