```ruby
module Migrator
  mattr_accessor :offer_migration_when_available
  @@offer_migration_when_available = true

  def self.migrations_path
    "#{::Rails.root.to_s}/db/migrate"
  end

  def self.available_migrations
    Dir["#{migrations_path}/[0-9]*_*.rb"].sort_by { |name| name.scan(/\d+/).first.to_i }
  end

  def self.needed_migrations(from)
    migs = []
    available_migrations.each do |mig|
      next if mig.gsub(migrations_path,"").split('_').first.tr('^0-9','').to_i <= from
      migs.push(mig)
    end
    migs
  end

  def self.current_schema_version
    ActiveRecord::Migrator.current_version rescue 0
  end

  def self.max_schema_version
    available_migrations.last.gsub(migrations_path,"").split('_').first.tr('^0-9','').to_i
  end

  def self.db_supports_migrations?
    ActiveRecord::Base.connection.supports_migrations?
  end

  def self.migrate(version = nil)
    ActiveRecord::Migrator.migrate("#{migrations_path}/", version)
  end
end
```

Fix a bug in the automated migration process. Under some undefined circumstances (reproduced on Debian wit Ruby ruby 1.9.2p136 but not on Mac OS 10.8 Ruby 1.9.3p194), administrator would be kicked out of the application because the sort_by{} would get confused where a sort is enough. Tested on both environments
user
```ruby
module Migrator
  mattr_accessor :offer_migration_when_available
  @@offer_migration_when_available = true

  def self.migrations_path
    "#{::Rails.root.to_s}/db/migrate"
  end

  def self.available_migrations
    Dir["#{migrations_path}/[0-9]*_*.rb"].sort
  end

  def self.needed_migrations(from)
    migs = []
    available_migrations.each do |mig|
      next if mig.gsub(migrations_path,"").split('_').first.tr('^0-9','').to_i <= from
      migs.push(mig)
    end
    migs
  end

  def self.current_schema_version
    ActiveRecord::Migrator.current_version rescue 0
  end

  def self.max_schema_version
    available_migrations.last.gsub(migrations_path,"").split('_').first.tr('^0-9','').to_i
  end

  def self.db_supports_migrations?
    ActiveRecord::Base.connection.supports_migrations?
  end

  def self.migrate(version = nil)
    ActiveRecord::Migrator.migrate("#{migrations_path}/", version)
  end
end
```
assistant