Adds closed_on column that stores the time of the last closing (#824).

The value is preserved when reopening the issue.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11402 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/20130215111127_add_issues_closed_on.rb

@@ -0,0 +1,9 @@
+class AddIssuesClosedOn < ActiveRecord::Migration
+  def up
+    add_column :issues, :closed_on, :datetime, :default => nil
+  end
+
+  def down
+    remove_column :issues, :closed_on
+  end
+end

db/migrate/20130215111141_populate_issues_closed_on.rb

@@ -0,0 +1,25 @@
+class PopulateIssuesClosedOn < ActiveRecord::Migration
+  def up
+    closed_status_ids = IssueStatus.where(:is_closed => true).pluck(:id)
+    if closed_status_ids.any?
+      # First set closed_on for issues that have been closed once
+      closed_status_values = closed_status_ids.map {|status_id| "'#{status_id}'"}.join(',')
+      subselect = "SELECT MAX(#{Journal.table_name}.created_on)" +
+        " FROM #{Journal.table_name}, #{JournalDetail.table_name}" +
+        " WHERE #{Journal.table_name}.id = #{JournalDetail.table_name}.journal_id" +
+        " AND #{Journal.table_name}.journalized_type = 'Issue' AND #{Journal.table_name}.journalized_id = #{Issue.table_name}.id" +
+        " AND #{JournalDetail.table_name}.property = 'attr' AND #{JournalDetail.table_name}.prop_key = 'status_id'" +
+        " AND #{JournalDetail.table_name}.old_value NOT IN (#{closed_status_values})" +
+        " AND #{JournalDetail.table_name}.value IN (#{closed_status_values})"
+      Issue.update_all "closed_on = (#{subselect})"
+
+      # Then set closed_on for closed issues that weren't up updated by the above UPDATE
+      # No journal was found so we assume that they were closed on creation
+      Issue.update_all "closed_on = created_on", {:status_id => closed_status_ids, :closed_on => nil}
+    end
+  end
+
+  def down
+    Issue.update_all :closed_on => nil
+  end
+end