gistfile1.rb

class Task  < ActiveRecord::Base

belongs_to :pending_tasks_in_project, :inverse_of => :pending_tasks, 
                                :class_name => 'Project',:foreign_key => :project_id,
                                :counter_cache => :pending_tasks_count
belongs_to :opened_tasks_in_project, :inverse_of => :opened_tasks, 
                                :class_name => 'Project',:foreign_key => :project_id,
                                :counter_cache => :opened_tasks_count
belongs_to :closed_tasks_in_project, :inverse_of => :closed_tasks, 
                                :class_name => 'Project', :foreign_key => :project_id,
                                :counter_cache => :closed_tasks_count
                                
end

class Project < ActiveRecord::Base
  
  has_many   :opened_tasks, 
             :class_name => 'Task',
             :conditions => { :status => 'opened'}
  
  has_many   :pending_tasks, 
             :class_name => 'Task',
             :conditions => { :status => 'pending'}
  
  has_many   :closed_tasks, 
             :class_name => 'Task',
             :conditions => { :status => 'closed' }
end