[#4552] Add the Labor hours spent to the Deliverable details

app/models/deliverable.rb

@@ -86,6 +86,11 @@ class Deliverable < ActiveRecord::Base
       (overhead_budgets.sum(:hours) || 0.0)
   end
 
+  # OPTIMIZE: N+1
+  def labor_hours_spent_total(date=nil)
+    issues.inject(0) {|total, issue| total += issue.billable_time_spent } # From redmine_overhead
+  end
+  
   # OPTIMIZE: N+1
   def hours_spent_total
     issues.inject(0) {|total, issue| total += issue.spent_hours }