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
revert(&block) click to toggle source

Creates a revert migration. This is the same as creating the same block with down, but it also calls the block and attempts to create a up block that will reverse the changes made by the block. This is designed to revert the changes in the provided 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
171 def revert(&block)
172   migration.down = block
173   migration.up = MigrationReverser.new.reverse(&block)
174 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