class Sequel::MigrationDSL

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

Attributes

migration[R]

The underlying SimpleMigration instance

Public Class Methods

create(&block) click to toggle source
    # File lib/sequel/extensions/migration.rb
120 def self.create(&block)
121   new(&block).migration
122 end
new(&block) click to toggle source

Create a new migration class, and instance_exec the block.

    # File lib/sequel/extensions/migration.rb
125 def initialize(&block)
126   @migration = SimpleMigration.new
127   Migration.descendants << migration
128   instance_exec(&block)
129 end

Public Instance Methods

change(&block) click to toggle source

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 works for some simple cases.

    # File lib/sequel/extensions/migration.rb
158 def change(&block)
159   migration.up = block
160   migration.down = MigrationReverser.new.reverse(&block)
161 end
down(&block) click to toggle source

Defines the migration's down action.

    # File lib/sequel/extensions/migration.rb
132 def down(&block)
133   migration.down = block
134 end
no_transaction() click to toggle source

Disable the use of transactions for the related migration

    # File lib/sequel/extensions/migration.rb
137 def no_transaction
138   migration.use_transactions = false
139 end
transaction() click to toggle source

Enable the use of transactions for the related migration

    # File lib/sequel/extensions/migration.rb
142 def transaction
143   migration.use_transactions = true
144 end
up(&block) click to toggle source

Defines the migration's up action.

    # File lib/sequel/extensions/migration.rb
147 def up(&block)
148   migration.up = block
149 end