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, line 117
def self.create(&block)
  new(&block).migration
end
new(&block) click to toggle source

Create a new migration class, and instance_exec the block.

# File lib/sequel/extensions/migration.rb, line 122
def initialize(&block)
  @migration = SimpleMigration.new
  Migration.descendants << migration
  instance_exec(&block)
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, line 155
def change(&block)
  migration.up = block
  migration.down = MigrationReverser.new.reverse(&block)
end
down(&block) click to toggle source

Defines the migration's down action.

# File lib/sequel/extensions/migration.rb, line 129
def down(&block)
  migration.down = block
end
no_transaction() click to toggle source

Disable the use of transactions for the related migration

# File lib/sequel/extensions/migration.rb, line 134
def no_transaction
  migration.use_transactions = false
end
transaction() click to toggle source

Enable the use of transactions for the related migration

# File lib/sequel/extensions/migration.rb, line 139
def transaction
  migration.use_transactions = true
end
up(&block) click to toggle source

Defines the migration's up action.

# File lib/sequel/extensions/migration.rb, line 144
def up(&block)
  migration.up = block
end