diff db/migrate/20111201201315_add_unique_index_to_issue_relations.rb @ 1115:433d4f72a19b redmine-2.2

Update to Redmine SVN revision 11137 on 2.2-stable branch

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/db/migrate/20111201201315_add_unique_index_to_issue_relations.rb	Mon Jan 07 12:01:42 2013 +0000
@@ -0,0 +1,16 @@
+class AddUniqueIndexToIssueRelations < ActiveRecord::Migration
+  def self.up
+
+    # Remove duplicates
+    IssueRelation.connection.select_values("SELECT r.id FROM #{IssueRelation.table_name} r" +
+      " WHERE r.id > (SELECT min(r1.id) FROM #{IssueRelation.table_name} r1 WHERE r1.issue_from_id = r.issue_from_id AND r1.issue_to_id = r.issue_to_id)").each do |i|
+        IssueRelation.delete_all(["id = ?", i])
+    end
+
+    add_index :issue_relations, [:issue_from_id, :issue_to_id], :unique => true
+  end
+
+  def self.down
+    remove_index :issue_relations, :column => [:issue_from_id, :issue_to_id]
+  end
+end