class Sequel::Migration

Sequel's older migration class, available for backward compatibility. Uses subclasses with up and down instance methods for each migration:

Class.new(Sequel::Migration) do
  def up
    create_table(:artists) do
      primary_key :id
      String :name
    end
  end

  def down
    drop_table(:artists)
  end
end

Part of the migration extension.

Public Class Methods

apply(db, direction) click to toggle source

Applies the migration to the supplied database in the specified direction.

# File lib/sequel/extensions/migration.rb, line 36
def self.apply(db, direction)
  raise(ArgumentError, "Invalid migration direction specified (#{direction.inspect})") unless [:up, :down].include?(direction)
  new(db).send(direction)
end
descendants() click to toggle source

Returns the list of Migration descendants.

# File lib/sequel/extensions/migration.rb, line 42
def self.descendants
  @descendants ||= []
end
inherited(base) click to toggle source

Adds the new migration class to the list of Migration descendants.

# File lib/sequel/extensions/migration.rb, line 47
def self.inherited(base)
  descendants << base
end
new(db) click to toggle source

Set the database associated with this migration.

# File lib/sequel/extensions/migration.rb, line 30
def initialize(db)
  @db = db
end
use_transactions() click to toggle source

Don't allow transaction overriding in old migrations.

# File lib/sequel/extensions/migration.rb, line 52
def self.use_transactions
  nil
end

Public Instance Methods

down() click to toggle source

The default down action does nothing

# File lib/sequel/extensions/migration.rb, line 57
def down
end
method_missing(method_sym, *args, &block) click to toggle source

Intercepts method calls intended for the database and sends them along.

# File lib/sequel/extensions/migration.rb, line 61
def method_missing(method_sym, *args, &block)
  @db.send(method_sym, *args, &block)
end
respond_to_missing?(meth, include_private) click to toggle source

This object responds to all methods the database responds to.

# File lib/sequel/extensions/migration.rb, line 66
def respond_to_missing?(meth, include_private)
  @db.respond_to?(meth, include_private)
end
up() click to toggle source

The default up action does nothing

# File lib/sequel/extensions/migration.rb, line 71
def up
end