class Sequel::MigrationDSL

  1. lib/sequel/extensions/migration.rb
Superclass: BasicObject

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

Methods

Public Class

  1. create
  2. new

Public Instance

  1. change
  2. down
  3. migration
  4. no_transaction
  5. transaction
  6. up

Attributes

migration [R]

The underlying SimpleMigration instance

Public Class methods

create(&block)
[show source] 
    # File lib/sequel/extensions/migration.rb
120 def self.create(&block)
121   new(&block).migration
122 end
new(&block)

Create a new migration class, and instance_exec the block.

[show source] 
    # 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)

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.

[show source] 
    # 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)

Defines the migration’s down action.

[show source] 
    # File lib/sequel/extensions/migration.rb
132 def down(&block)
133   migration.down = block
134 end
no_transaction()

Disable the use of transactions for the related migration

[show source] 
    # File lib/sequel/extensions/migration.rb
137 def no_transaction
138   migration.use_transactions = false
139 end
transaction()

Enable the use of transactions for the related migration

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

Defines the migration’s up action.

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