Outlined new concept for multiple periodically recurring tasks (#3).

app/models/periodic_task_group.rb

@@ -0,0 +1,23 @@
+class PeriodicTaskGroup < ActiveRecord::Base
+  has_many :tasks, :inverse_of => :periodic_task_group, :dependent => :destroy
+
+  PeriodDays = 7
+  
+  def has_next_task?
+    return false if self.tasks.empty?
+    return false if self.tasks.first.due_date.nil?
+    return true
+  end
+
+  def create_next_task
+    template_task = self.tasks.first
+    self.next_task_date ||= template_task.due_date + PeriodDays
+    
+    next_task = template_task.dup
+    next_task.due_date = self.next_task_date    
+    next_task.save
+
+    self.next_task_date += PeriodDays
+    self.save
+  end
+end

app/models/task.rb

@@ -2,6 +2,7 @@ class Task < ActiveRecord::Base
   has_many :assignments, :dependent => :destroy
   has_many :users, :through => :assignments
   belongs_to :workgroup
+  belongs_to :periodic_task_group, :inverse_of => :tasks
 
   scope :non_group, where(workgroup_id: nil, done: false)
   scope :done, where(done: true)
@@ -45,6 +46,14 @@ class Task < ActiveRecord::Base
     end
   end
 
+  def periodic
+    not periodic_task_group.nil?
+  end
+
+  def periodic=(p)
+    self.periodic_task_group = PeriodicTaskGroup.new if p == "1"
+  end  
+  
   def is_assigned?(user)
     self.assignments.detect {|ass| ass.user_id == user.id }
   end