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
Source
# File lib/sequel/extensions/migration.rb 42 def self.apply(db, direction) 43 raise(ArgumentError, "Invalid migration direction specified (#{direction.inspect})") unless [:up, :down].include?(direction) 44 new(db).public_send(direction) 45 end
Applies the migration to the supplied database in the specified direction.
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# File lib/sequel/extensions/migration.rb 48 def self.descendants 49 @descendants ||= [] 50 end
Returns the list of Migration
descendants.
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# File lib/sequel/extensions/migration.rb 53 def self.inherited(base) 54 descendants << base 55 end
Adds the new migration class to the list of Migration
descendants.
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# File lib/sequel/extensions/migration.rb 36 def initialize(db) 37 @db = db 38 end
Set the database associated with this migration.
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# File lib/sequel/extensions/migration.rb 58 def self.use_transactions 59 nil 60 end
Don’t allow transaction overriding in old migrations.
Public Instance Methods
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# File lib/sequel/extensions/migration.rb 63 def down 64 end
The default down action does nothing
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# File lib/sequel/extensions/migration.rb 67 def method_missing(method_sym, *args, &block) 68 # Allow calling private methods for backwards compatibility 69 @db.send(method_sym, *args, &block) 70 end
Intercepts method calls intended for the database and sends them along.
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# File lib/sequel/extensions/migration.rb 76 def respond_to_missing?(meth, include_private) 77 @db.respond_to?(meth, include_private) 78 end
This object responds to all methods the database responds to.
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# File lib/sequel/extensions/migration.rb 81 def up 82 end
The default up action does nothing