From 77c6188ec27288470d5270213aa0aef3be0eb655 Mon Sep 17 00:00:00 2001
From: Jean-Philippe Lang <jp_lang@yahoo.fr>
Date: Sun, 21 Nov 2010 13:54:26 +0000
Subject: [PATCH] Fixed: gantt displays issues by date of creation.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4421 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 app/models/issue.rb          |  3 +--
 lib/redmine/helpers/gantt.rb | 13 +++++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/app/models/issue.rb b/app/models/issue.rb
index 8fdf4b39c..0b08f0c16 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -68,8 +68,7 @@ class Issue < ActiveRecord::Base
                                   :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"
+      :include => [:tracker, :status, :assigned_to, :priority, :project, :fixed_version]
     }
   }
 
diff --git a/lib/redmine/helpers/gantt.rb b/lib/redmine/helpers/gantt.rb
index ea7f1417a..ac8f80d0f 100644
--- a/lib/redmine/helpers/gantt.rb
+++ b/lib/redmine/helpers/gantt.rb
@@ -178,6 +178,7 @@ module Redmine
         
         # Second, Issues without a version
         issues = project.issues.for_gantt.without_version.with_query(@query)
+        sort_issues!(issues)
         if issues
           issue_rendering = render_issues(issues, options)
           output << issue_rendering if options[:format] == :html
@@ -237,6 +238,7 @@ module Redmine
         
         issues = version.fixed_issues.for_gantt.with_query(@query)
         if issues
+          sort_issues!(issues)
           # Indent issues
           options[:indent] += options[:indent_increment]
           output << render_issues(issues, options)
@@ -952,6 +954,17 @@ module Redmine
       
       private
 
+      # Sorts a collection of issues by start_date, due_date, id for gantt rendering
+      def sort_issues!(issues)
+        issues.sort! do |a, b|
+          cmp = 0
+          cmp = (a.start_date <=> b.start_date) if a.start_date? && b.start_date?
+          cmp = (a.due_date <=> b.due_date) if cmp == 0 && a.due_date? && b.due_date?
+          cmp = (a.id <=> b.id) if cmp == 0
+          cmp
+        end
+      end
+      
       # Renders both the subjects and lines of the Gantt chart for the
       # PDF format
       def pdf_subjects_and_lines(pdf, options = {})
-- 
2.39.5