Rewrite the Gantt chart. #6276

This version of the Gantt chart supports nested charts. So Projects,
Versions, and Issues will be nested underneath their parents correctly.

Additional features:

* Move all Gantt code to Redmine::Helpers::Gantt class instead of having it in
  the Gantt class, controller, and view
* Recursive and nest sub-projects
* Recursive and nest versions
* Recursive and nest issues
* Draw a line showing when a Project is active and it's progress
* Draw a line showing when a Version is active and it's progress
* Show a version's % complete
* Change the color of Projects, Versions, and Issues if they are late or
  behind schedule
* Added Project#start_date and #due_date
* Added Project#completed_percent
* Use a mini-gravatar on the Gantt chart
* Added tests for the Gantt rendering

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4072 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -62,10 +62,28 @@ class Issue < ActiveRecord::Base
   
   named_scope :open, :conditions => ["#{IssueStatus.table_name}.is_closed = ?", false], :include => :status
 
-  named_scope :recently_updated, :order => "#{self.table_name}.updated_on DESC"
+  named_scope :recently_updated, :order => "#{Issue.table_name}.updated_on DESC"
   named_scope :with_limit, lambda { |limit| { :limit => limit} }
   named_scope :on_active_project, :include => [:status, :project, :tracker],
                                   :conditions => ["#{Project.table_name}.status=#{Project::STATUS_ACTIVE}"]
+  named_scope :for_gantt, lambda {
+    {
+      :include => [:tracker, :status, :assigned_to, :priority, :project, :fixed_version],
+      :order => "#{Issue.table_name}.due_date ASC, #{Issue.table_name}.start_date ASC, #{Issue.table_name}.id ASC"
+    }
+  }
+
+  named_scope :without_version, lambda {
+    {
+      :conditions => { :fixed_version_id => nil}
+    }
+  }
+
+  named_scope :with_query, lambda {|query|
+    {
+      :conditions => Query.merge_conditions(query.statement)
+    }
+  }
 
   before_create :default_assign
   before_save :reschedule_following_issues, :close_duplicates, :update_done_ratio_from_issue_status
@@ -357,6 +375,13 @@ class Issue < ActiveRecord::Base
   def overdue?
     !due_date.nil? && (due_date < Date.today) && !status.is_closed?
   end
+
+  # Is the amount of work done less than it should for the due date
+  def behind_schedule?
+    return false if start_date.nil? || due_date.nil?
+    done_date = start_date + ((due_date - start_date+1)* done_ratio/100).floor
+    return done_date <= Date.today
+  end
   
   # Users the issue can be assigned to
   def assignable_users