Class Sequel::MigrationDSL
In: lib/sequel/extensions/migration.rb
Parent: BasicObject

Internal class used by the Sequel.migration DSL, part of the migration extension.

Methods

change   create   down   new   up  

Attributes

migration  [R]  The underlying Migration instance

Public Class methods

[Source]

    # File lib/sequel/extensions/migration.rb, line 86
86:     def self.create(&block)
87:       new(&block).migration
88:     end

Create a new migration class, and instance_eval the block.

[Source]

    # File lib/sequel/extensions/migration.rb, line 91
91:     def initialize(&block)
92:       @migration = SimpleMigration.new
93:       Migration.descendants << migration
94:       instance_eval(&block)
95:     end

Public Instance methods

Creates a reversible migration. This is the same as creating the same block with up, but it also calls the block and attempts to create a down block that will reverse the changes made by the block.

There are no guarantees that this will work perfectly in all cases, but it should work for most common cases.

[Source]

     # File lib/sequel/extensions/migration.rb, line 114
114:     def change(&block)
115:       migration.up = block
116:       migration.down = MigrationReverser.new.reverse(&block)
117:     end

Defines the migration‘s down action.

[Source]

     # File lib/sequel/extensions/migration.rb, line 98
 98:     def down(&block)
 99:       migration.down = block
100:     end

Defines the migration‘s up action.

[Source]

     # File lib/sequel/extensions/migration.rb, line 103
103:     def up(&block)
104:       migration.up = block
105:     end

[Validate]