Class Sequel::MigrationDSL
In: lib/sequel/extensions/migration.rb
Parent: BasicObject

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

Methods

change   create   down   new   no_transaction   transaction   up  

Attributes

migration  [R]  The underlying Migration instance

Public Class methods

[Source]

     # File lib/sequel/extensions/migration.rb, line 104
104:     def self.create(&block)
105:       new(&block).migration
106:     end

Create a new migration class, and instance_eval the block.

[Source]

     # File lib/sequel/extensions/migration.rb, line 109
109:     def initialize(&block)
110:       @migration = SimpleMigration.new
111:       Migration.descendants << migration
112:       instance_eval(&block)
113:     end

Public Instance methods

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 should work for most common cases.

[Source]

     # File lib/sequel/extensions/migration.rb, line 142
142:     def change(&block)
143:       migration.up = block
144:       migration.down = MigrationReverser.new.reverse(&block)
145:     end

Defines the migration‘s down action.

[Source]

     # File lib/sequel/extensions/migration.rb, line 116
116:     def down(&block)
117:       migration.down = block
118:     end

Disable the use of transactions for the related migration

[Source]

     # File lib/sequel/extensions/migration.rb, line 121
121:     def no_transaction
122:       migration.use_transactions = false
123:     end

Enable the use of transactions for the related migration

[Source]

     # File lib/sequel/extensions/migration.rb, line 126
126:     def transaction
127:       migration.use_transactions = true
128:     end

Defines the migration‘s up action.

[Source]

     # File lib/sequel/extensions/migration.rb, line 131
131:     def up(&block)
132:       migration.up = block
133:     end

[Validate]