Exception undefined method `milestone_id'
Created by: RubingHan
I upgraded gitlab from 3.0.3 to 3.1.0 in accordance with https://github.com/gitlabhq/gitlabhq/wiki/From-3.0-to-3.1. But exception occured when I create merge-request:
Started GET "/test/merge_requests/new" for 127.0.0.1 at 2012-11-30 10:33:54 +0800
Processing by MergeRequestsController#new as HTML
  Parameters: {"project_id"=>"test"}
  Rendered merge_requests/_form.html.haml (27.1ms)
  Rendered merge_requests/new.html.haml within layouts/project_resource (29.7ms)
Completed 500 Internal Server Error in 51ms
ActionView::Template::Error (undefined method `milestone_id' for #):
    43:           = f.label :milestone_id do
    44:             %i.icon-time
    45:             Milestone
    46:           .input= f.select(:milestone_id, @project.milestones.active.all.collect {|p| [ p.title, p.id ] }, { in
clude_blank: "Select milestone" }, {class: 'chosen'})
    47:
    48:   .control-group
    49:
  app/views/merge_requests/_form.html.haml:46:in `block in _app_views_merge_requests__form_html_haml___2955564168459621
257_60855980'
  app/views/merge_requests/_form.html.haml:1:in `_app_views_merge_requests__form_html_haml___2955564168459621257_608559
80'
  app/views/merge_requests/new.html.haml:3:in `_app_views_merge_requests_new_html_haml___2714123960864570756_60837980'