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

app/views/tasks/_form.html.haml

@@ -23,6 +23,7 @@
   = f.input :required_users
   = f.association :workgroup
   = f.input :due_date, as: :date_picker
+  = f.input :periodic, as: :boolean
   = f.input :done
   .form-actions
     = f.submit class: 'btn'

config/locales/de.yml

@@ -312,6 +312,7 @@ de:
         required_users: 'Anzahl'
         due_date: 'Wann erledigen?'
         workgroup: 'Arbeitsgruppe'
+        periodic: 'Wöchentlich wiederholen'
         done: Erledigt?
       message:
         sent_to_all: 'An alle Mitglieder schicken'

db/migrate/20121115073715_create_periodic_task_groups.rb

@@ -0,0 +1,13 @@
+class CreatePeriodicTaskGroups < ActiveRecord::Migration
+  def change
+    create_table :periodic_task_groups do |t|
+      t.date :next_task_date
+
+      t.timestamps
+    end
+
+    change_table :tasks do |t|
+      t.references :periodic_task_group
+    end
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20120929155541) do
+ActiveRecord::Schema.define(:version => 20121115073715) do
 
   create_table "article_categories", :force => true do |t|
     t.string "name",        :default => "", :null => false
@@ -284,6 +284,12 @@ ActiveRecord::Schema.define(:version => 20120929155541) do
   add_index "pages", ["permalink"], :name => "index_pages_on_permalink"
   add_index "pages", ["title"], :name => "index_pages_on_title"
 
+  create_table "periodic_task_groups", :force => true do |t|
+    t.date     "next_task_date"
+    t.datetime "created_at",     :null => false
+    t.datetime "updated_at",     :null => false
+  end
+
   create_table "stock_changes", :force => true do |t|
     t.integer  "delivery_id"
     t.integer  "order_id"
@@ -335,6 +341,7 @@ ActiveRecord::Schema.define(:version => 20120929155541) do
     t.integer  "required_users",         :default => 1
     t.boolean  "weekly"
     t.integer  "duration",               :default => 1
+    t.integer  "periodic_task_group_id"
   end
 
   add_index "tasks", ["due_date"], :name => "index_tasks_on_due_date"

lib/tasks/foodsoft.rake

@@ -49,4 +49,15 @@ namespace :foodsoft do
       end
     end
   end
+
+  desc "Create upcoming periodic tasks"
+  task :create_upcoming_periodic_tasks => :environment do
+    for tg in PeriodicTaskGroup.all
+      if tg.has_next_task?
+        while tg.next_task_date.nil? or tg.next_task_date < Date.today + 30
+          tg.create_next_task
+        end
+      end
+    end
+  end
 end