直播增加级别限制

app/models/live_broad.rb

@@ -85,7 +85,7 @@ class LiveBroad < ActiveRecord::Base
           field :recommend
           field :rank_str do
             render do
-              bindings[:form].select( "roles", bindings[:object].RANK_ENUM, {}, { :multiple => true })
+              bindings[:form].select( "rank_str", bindings[:object].RANK_ENUM, {}, { :multiple => true })
             end
           end