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   no_transaction   transaction   up  

Attributes

migration  [R]  The underlying Migration instance

Public Class methods

[Source]

     # File lib/sequel/extensions/migration.rb, line 101
101:     def self.create(&block)
102:       new(&block).migration
103:     end

Create a new migration class, and instance_eval the block.

[Source]

     # File lib/sequel/extensions/migration.rb, line 106
106:     def initialize(&block)
107:       @migration = SimpleMigration.new
108:       Migration.descendants << migration
109:       instance_eval(&block)
110:     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 139
139:     def change(&block)
140:       migration.up = block
141:       migration.down = MigrationReverser.new.reverse(&block)
142:     end

Defines the migration‘s down action.

[Source]

     # File lib/sequel/extensions/migration.rb, line 113
113:     def down(&block)
114:       migration.down = block
115:     end

Disable the use of transactions for the related migration

[Source]

     # File lib/sequel/extensions/migration.rb, line 118
118:     def no_transaction
119:       migration.use_transactions = false
120:     end

Enable the use of transactions for the related migration

[Source]

     # File lib/sequel/extensions/migration.rb, line 123
123:     def transaction
124:       migration.use_transactions = true
125:     end

Defines the migration‘s up action.

[Source]

     # File lib/sequel/extensions/migration.rb, line 128
128:     def up(&block)
129:       migration.up = block
130:     end

[Validate]