Implemented stats for ordergroups on startpage. Annotated models.

app/models/ordergroup.rb

@@ -1,29 +1,29 @@
 # == Schema Information
-# Schema version: 20090120184410
 #
 # Table name: groups
 #
-#  id                  :integer         not null, primary key
+#  id                  :integer(4)      not null, primary key
 #  type                :string(255)     default(""), not null
 #  name                :string(255)     default(""), not null
 #  description         :string(255)
-#  account_balance     :decimal(, )     default(0.0), not null
+#  account_balance     :decimal(8, 2)   default(0.0), not null
 #  account_updated     :datetime
 #  created_on          :datetime        not null
-#  role_admin          :boolean         not null
-#  role_suppliers      :boolean         not null
-#  role_article_meta   :boolean         not null
-#  role_finance        :boolean         not null
-#  role_orders         :boolean         not null
-#  weekly_task         :boolean
-#  weekday             :integer
+#  role_admin          :boolean(1)      not null
+#  role_suppliers      :boolean(1)      not null
+#  role_article_meta   :boolean(1)      not null
+#  role_finance        :boolean(1)      not null
+#  role_orders         :boolean(1)      not null
+#  weekly_task         :boolean(1)
+#  weekday             :integer(4)
 #  task_name           :string(255)
 #  task_description    :string(255)
-#  task_required_users :integer         default(1)
+#  task_required_users :integer(4)      default(1)
 #  deleted_at          :datetime
 #  contact_person      :string(255)
 #  contact_phone       :string(255)
 #  contact_address     :string(255)
+#  stats               :text
 #
 
 # Ordergroups can order, they are "children" of the class Group
@@ -34,6 +34,7 @@
 class Ordergroup < Group
   acts_as_paranoid                    # Avoid deleting the ordergroup for consistency of order-results
   extend ActiveSupport::Memoizable    # Ability to cache method results. Use memoize :expensive_method
+  serialize :stats
 
   has_many :financial_transactions, :order => "created_on DESC"
   has_many :group_orders
@@ -41,6 +42,8 @@ class Ordergroup < Group
 
   validates_numericality_of :account_balance, :message => 'ist keine gültige Zahl'
 
+  after_create :update_stats!
+
   def contact
     "#{contact_phone} (#{contact_person})"
   end
@@ -76,6 +79,23 @@ class Ordergroup < Group
     end
   end
 
+  def update_stats!
+    time = 6.month.ago
+    jobs = users.collect { |u| u.tasks.done.all(:conditions => ["updated_on > ?", time]).size }.sum
+    orders_sum = group_orders.collect { |go| go.price if go.order.ends > time }.sum
+    update_attribute(:stats, {:jobs_size => jobs, :orders_sum => orders_sum})
+  end
+
+  def avg_jobs_per_euro
+    stats[:orders_sum] != 0 ? stats[:jobs_size].to_f / stats[:orders_sum].to_f : 0
+  end
+
+  # Global average
+  def self.avg_jobs_per_euro
+    stats = Ordergroup.all.collect(&:stats)
+    stats.collect {|s| s[:jobs_size].to_f }.sum / stats.collect {|s| s[:orders_sum].to_f }.sum
+  end
+  
   private
   
   # If this order group's account balance is made negative by the given/last transaction,