rake db:migrate:status displays status of migrations [#4947 state:resolved]

Signed-off-by: Michael Koziarski <michael@koziarski.com>

activerecord/lib/active_record/railties/databases.rake

@@ -171,6 +171,31 @@ namespace :db do
       ActiveRecord::Migrator.run(:down, "db/migrate/", version)
       Rake::Task["db:schema:dump"].invoke if ActiveRecord::Base.schema_format == :ruby
     end
+
+    desc "Display status of migrations"
+    task :status => :environment do
+      config = ActiveRecord::Base.configurations[Rails.env || 'development']
+      db_list = ActiveRecord::Base.connection.select_values("SELECT version FROM schema_migrations")
+      file_list = []
+      Dir.foreach(File.join(Rails.root, 'db', 'migrate')) do |file|
+        # only files matching "20091231235959_some_name.rb" pattern
+        if match_data = /(\d{14})_(.+)\.rb/.match(file)
+          status = db_list.delete(match_data[1]) ? 'up' : 'down'
+          file_list << [status, match_data[1], match_data[2]]
+        end
+      end
+      # output
+      puts "\ndatabase: #{config['database']}\n\n"
+      puts "#{"Status".center(8)}  #{"Migration ID".ljust(14)}  Migration Name"
+      puts "-" * 50
+      file_list.each do |file|
+        puts "#{file[0].center(8)}  #{file[1].ljust(14)}  #{file[2].humanize}"
+      end
+      db_list.each do |version|
+        puts "#{'up'.center(8)}  #{version.ljust(14)}  *** NO FILE ***"
+      end
+      puts
+    end
   end
 
   desc 'Rolls the schema back to the previous version (specify steps w/ STEP=n).'