fixes patching the work_package#show page

app/views/hooks/_view_issues_show_details_bottom.html.erb

@@ -4,7 +4,7 @@
     <%# disables core's spent-time as it is not displayed if the user has just the view_own_time_entries permission %>
     .spent-time { display: none }
   </style>
-  <% attributes_array = cost_issues_attributes %>
+  <% attributes_array = cost_issues_attributes(controller.work_package) %>
   <% (0..(attributes_array.size - 1)).step(2) do |i| %>
     <tr>
       <th>

lib/open_project/costs/patches/issues_helper_patch.rb

@@ -42,13 +42,13 @@ module OpenProject::Costs::Patches::IssuesHelperPatch
         str_array.join(", ").html_safe
       end
 
-      def cost_issues_attributes
+      def cost_issues_attributes(work_package)
         attributes = []
 
-        object_value = if @work_package.cost_object.nil?
+        object_value = if work_package.cost_object.nil?
                          "-"
                        else
-                         link_to_cost_object(@work_package.cost_object)
+                         link_to_cost_object(work_package.cost_object)
                        end
 
         attributes << [CostObject.model_name.human, object_value]
@@ -56,8 +56,11 @@ module OpenProject::Costs::Patches::IssuesHelperPatch
         if User.current.allowed_to?(:view_time_entries, @project) ||
            User.current.allowed_to?(:view_own_time_entries, @project)
 
-           value = @work_package.spent_hours > 0 ?
-                     link_to(l_hours(@work_package.spent_hours), issue_time_entries_path(@work_package)) : "-"
+          #TODO: put inside controller or model
+           summed_hours = @time_entries.sum(&:hours)
+
+           value = summed_hours > 0 ?
+                     link_to(l_hours(summed_hours), issue_time_entries_path(work_package)) : "-"
 
            attributes << [Issue.human_attribute_name(:spent_hours), value]
         end