Adds version status to limit issue assignments (#1245).

Available version statuses are:
* open: no restriction
* locked: can not assign new issues to the version
* closed: can not assign new issues and can not reopen assigned issues

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3020 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/version.rb

@@ -22,11 +22,16 @@ class Version < ActiveRecord::Base
   acts_as_attachable :view_permission => :view_files,
                      :delete_permission => :manage_files
 
+  VERSION_STATUSES = %w(open locked closed)
+  
   validates_presence_of :name
   validates_uniqueness_of :name, :scope => [:project_id]
   validates_length_of :name, :maximum => 60
   validates_format_of :effective_date, :with => /^\d{4}-\d{2}-\d{2}$/, :message => :not_a_date, :allow_nil => true
-  
+  validates_inclusion_of :status, :in => VERSION_STATUSES
+
+  named_scope :open, :conditions => {:status => 'open'}
+    
   def start_date
     effective_date
   end
@@ -45,6 +50,10 @@ class Version < ActiveRecord::Base
     @spent_hours ||= TimeEntry.sum(:hours, :include => :issue, :conditions => ["#{Issue.table_name}.fixed_version_id = ?", id]).to_f
   end
   
+  def closed?
+    status == 'closed'
+  end
+  
   # Returns true if the version is completed: due date reached and no open issues
   def completed?
     effective_date && (effective_date <= Date.today) && (open_issues_count == 0)