From 74d8739936c85b39a483ab50ec3b5c9fec36c8a0 Mon Sep 17 00:00:00 2001
From: Jean-Philippe Lang <jp_lang@yahoo.fr>
Date: Thu, 12 Mar 2009 19:49:39 +0000
Subject: [PATCH] Adds a unique index on projects_trackers table (#2882).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2580 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 ...4159_add_projects_trackers_unique_index.rb | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 db/migrate/20090312194159_add_projects_trackers_unique_index.rb

diff --git a/db/migrate/20090312194159_add_projects_trackers_unique_index.rb b/db/migrate/20090312194159_add_projects_trackers_unique_index.rb
new file mode 100644
index 000000000..02a8fa68e
--- /dev/null
+++ b/db/migrate/20090312194159_add_projects_trackers_unique_index.rb
@@ -0,0 +1,21 @@
+class AddProjectsTrackersUniqueIndex < ActiveRecord::Migration
+  def self.up
+    remove_duplicates
+    add_index :projects_trackers, [:project_id, :tracker_id], :name => :projects_trackers_unique, :unique => true
+  end
+
+  def self.down
+    remove_index :projects_trackers, :name => :projects_trackers_unique
+  end
+
+  # Removes duplicates in projects_trackers table
+  def self.remove_duplicates
+    Project.find(:all).each do |project|
+      ids = project.trackers.collect(&:id)
+      unless ids == ids.uniq
+        project.trackers.clear
+        project.tracker_ids = ids.uniq
+      end
+    end
+  end
+end