Create role by copy (#9258).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10285 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/role.rb

@@ -67,6 +67,15 @@ class Role < ActiveRecord::Base
     :in => ISSUES_VISIBILITY_OPTIONS.collect(&:first),
     :if => lambda {|role| role.respond_to?(:issues_visibility)}
 
+  # Copies attributes from another role, arg can be an id or a Role
+  def copy_from(arg, options={})
+    return unless arg.present?
+    role = arg.is_a?(Role) ? arg : Role.find_by_id(arg.to_s)
+    self.attributes = role.attributes.dup.except("id", "name", "position", "builtin", "permissions")
+    self.permissions = role.permissions.dup
+    self
+  end
+
   def permissions=(perms)
     perms = perms.collect {|p| p.to_sym unless p.blank? }.compact.uniq if perms
     write_attribute(:permissions, perms)