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

create(&block)

[Source]

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

Create a new migration class, and instance_eval the block.

[Source]

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

Public Instance methods

change(&block)

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 115
115:     def change(&block)
116:       migration.up = block
117:       migration.down = MigrationReverser.new.reverse(&block)
118:     end
down(&block)

Defines the migration‘s down action.

[Source]

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

Defines the migration‘s up action.

[Source]

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

[Validate]