直播增加级别限制

db/migrate/20210917032357_add_rank_str_column_to_live_broads.rb

@@ -1,6 +1,6 @@
 # This migration and CreateVersionAssociations provide the necessary
 # schema for tracking associations.
-class AdRankStrColumnToLiveBroads < ActiveRecord::Migration
+class AddRankStrColumnToLiveBroads < ActiveRecord::Migration
   def self.up
     add_column :live_broads, :rank_strs, :string, :default=>""
   end