Show only 2 tasks of the same periodic_task_group at dashboard

app/controllers/home_controller.rb

@@ -8,7 +8,7 @@ class HomeController < ApplicationController
     @next_tasks = Task.order(:due_date).next_assigned_tasks_for(current_user)
     # count tasks with no responsible person
     # tasks for groups the current user is not a member are ignored
-    @unassigned_tasks = Task.order(:due_date).unassigned_tasks_for(current_user)
+    @unassigned_tasks = Task.order(:due_date).next_unassigned_tasks_for(current_user)
   end
 
   def profile

app/models/task.rb

@@ -52,6 +52,16 @@ class Task < ActiveRecord::Base
     end
   end
 
+  def self.next_unassigned_tasks_for(user, max = 2)
+    periodic_task_group_count = {}
+    self.unassigned_tasks_for(user).reject do |item|
+      return false unless item.periodic_task_group
+      count = periodic_task_group_count[item.periodic_task_group] || 0
+      periodic_task_group_count[item.periodic_task_group] = count + 1
+      count >= max
+    end
+  end
+
   def periodic?
     not periodic_task_group.nil?
   end