Where did these migrations come from?

migrations_missing_files.rb

def migrations_without_files
  results = ActiveRecord::Base.connection.execute("select * from schema_migrations;")
  migrations = []
  results.each { |r| migrations << r }
  migrations.flatten!.map!{ |m| m.gsub(/[^\d]*/,"")}

  migrate_path = File.join(RAILS_ROOT,"db","migrate","*.rb")
  files = Dir.glob(migrate_path).map{ |f| f.gsub(/.*\/(\d+)_.*/, '\1') }
  missing_files = migrations.reject { |m| files.include?(m) }
end