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 119
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 124
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 157
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 131
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 136
def no_transaction
  migration.use_transactions = false
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, line 170
def revert(&block)
  migration.down = block
  migration.up = MigrationReverser.new.reverse(&block)
end
transaction() click to toggle source

Enable the use of transactions for the related migration

# File lib/sequel/extensions/migration.rb, line 141
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 146
def up(&block)
  migration.up = block
end