Prevent ActiveRecord::StaleObjectError in Issue#reschedule_after (#7920).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8864 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -638,7 +638,13 @@ class Issue < ActiveRecord::Base
     if leaf?
       if start_date.nil? || start_date < date
         self.start_date, self.due_date = date, date + duration
-        save
+        begin
+          save
+        rescue ActiveRecord::StaleObjectError
+          reload
+          self.start_date, self.due_date = date, date + duration
+          save
+        end
       end
     else
       leaves.each do |leaf|

test/unit/issue_test.rb

@@ -768,6 +768,19 @@ class IssueTest < ActiveSupport::TestCase
     assert_equal issue1.due_date + 1, issue2.reload.start_date
   end
 
+  def test_rescheduling_a_stale_issue_should_not_raise_an_error
+    stale = Issue.find(1)
+    issue = Issue.find(1)
+    issue.subject = "Updated"
+    issue.save!
+
+    date = 10.days.from_now.to_date
+    assert_nothing_raised do
+      stale.reschedule_after(date)
+    end
+    assert_equal date, stale.reload.start_date
+  end
+
   def test_overdue
     assert Issue.new(:due_date => 1.day.ago.to_date).overdue?
     assert !Issue.new(:due_date => Date.today).overdue?