application_helper.rb

  def project_completion_metric(project)
    work_unit_hours_array = Array.new # Empty array to work with

    # Take the summation of estimated_hours on a ticket from the project
    estimated_hours       = Ticket.sum(:estimated_hours, :conditions => ['project_id => ?', project.id]) 
    
    # Push the work unit hours in if the ticket on the project has estimated hours
    WorkUnit.for_project(project).each { |w|
      work_unit_hours_array << w.hours if (w.ticket.estimated_hours != nil) 
    }
    
    # Store the summation of the work unit hours in a proper variable
    work_unit_hours = work_unit_hours_array.sum
    
    # Calculatre the projects completion as a percent
    percent = (((work_unit_hours / estimated_hours)).to_f * 100.00).round(2) rescue 0
    [percent, 100].min # Make sure you don't go over 100 percent and confuse the graphs
  end