Class: Sequel::MigrationDSL

Inherits:
BasicObject
Defined in:
lib/sequel/extensions/migration.rb

Overview

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

Constant Summary

Constants inherited from BasicObject

BasicObject::KEEP_METHODS

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BasicObject

const_missing, remove_methods!

Constructor Details

#initialize(&block) ⇒ MigrationDSL

Create a new migration class, and instance_eval the block.



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# File 'lib/sequel/extensions/migration.rb', line 92

def initialize(&block)
  @migration = SimpleMigration.new
  Migration.descendants << migration
  instance_eval(&block)
end

Instance Attribute Details

#migration ⇒ Object (readonly)

The underlying Migration instance



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# File 'lib/sequel/extensions/migration.rb', line 85

def migration
  @migration
end

Class Method Details

.create(&block) ⇒ Object 



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# File 'lib/sequel/extensions/migration.rb', line 87

def self.create(&block)
  new(&block).migration
end

Instance Method Details

#change(&block) ⇒ Object

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.



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# File 'lib/sequel/extensions/migration.rb', line 115

def change(&block)
  migration.up = block
  migration.down = MigrationReverser.new.reverse(&block)
end

#down(&block) ⇒ Object

Defines the migration’s down action.



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# File 'lib/sequel/extensions/migration.rb', line 99

def down(&block)
  migration.down = block
end

#up(&block) ⇒ Object

Defines the migration’s up action.



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# File 'lib/sequel/extensions/migration.rb', line 104

def up(&block)
  migration.up = block
end