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
Instance Attribute Summary collapse
-
#migration ⇒ Object
readonly
The underlying Migration instance.
Class Method Summary collapse
Instance Method Summary collapse
-
#change(&block) ⇒ Object
Creates a reversible migration.
-
#down(&block) ⇒ Object
Defines the migration’s down action.
-
#initialize(&block) ⇒ MigrationDSL
constructor
Create a new migration class, and instance_eval the block.
-
#up(&block) ⇒ Object
Defines the migration’s up action.
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 |