Class | Sequel::Migration
In: | lib/sequel/extensions/migration.rb
Parent: | Object

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.

### Methods

apply descendants down inherited method_missing new up

### Public Class methods

apply(db, direction)

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

[Source]

        # File lib/sequel/extensions/migration.rb, line 32
    32:     def self.apply(db, direction)
    33:       raise(ArgumentError, "Invalid migration direction specified (#{direction.inspect})") unless [:up, :down].include?(direction)
    34:       new(db).send(direction)
    35:     end

descendants()

Returns the list of Migration descendants.

[Source]

        # File lib/sequel/extensions/migration.rb, line 38
    38:     def self.descendants
    39:       @descendants ||= []
    40:     end

inherited(base)

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

[Source]

        # File lib/sequel/extensions/migration.rb, line 43
    43:     def self.inherited(base)
    44:       descendants << base
    45:     end

new(db)

Creates a new instance of the migration and sets the @db attribute.

[Source]

        # File lib/sequel/extensions/migration.rb, line 26
    26:     def initialize(db)
    27:       @db = db
    28:     end

### Public Instance methods

down()

The default down action does nothing

[Source]

        # File lib/sequel/extensions/migration.rb, line 48
    48:     def down
    49:     end

method_missing(method_sym, *args, &block)

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

[Source]

        # File lib/sequel/extensions/migration.rb, line 52
    52:     def method_missing(method_sym, *args, &block)
    53:       @db.send(method_sym, *args, &block)
    54:     end

up()

The default up action does nothing

[Source]

        # File lib/sequel/extensions/migration.rb, line 57
    57:     def up
    58:     end

[Validate]