Remove unused implementation of next_migration_number

activerecord/lib/rails/generators/active_record.rb

 require 'rails/generators/named_base'
 require 'rails/generators/migration'
 require 'rails/generators/active_model'
-require 'rails/generators/active_record/migration'
 require 'active_record'
 
 module ActiveRecord
   module Generators
     class Base < Rails::Generators::NamedBase #:nodoc:
       include Rails::Generators::Migration
-      extend ActiveRecord::Generators::Migration
 
       # Set the current directory as base for the inherited generators.
       def self.base_root

activerecord/lib/rails/generators/active_record/migration.rb

-module ActiveRecord
-  module Generators
-    module Migration
-      # Implement the required interface for Rails::Generators::Migration.
-      def next_migration_number(dirname) #:nodoc:
-        next_migration_number = current_migration_number(dirname) + 1
-        if ActiveRecord::Base.timestamped_migrations
-          [Time.now.utc.strftime("%Y%m%d%H%M%S"), "%.14d" % next_migration_number].max
-        else
-          "%.3d" % next_migration_number
-        end
-      end
-    end
-  end
-end