Class Sequel::IntegerMigrator
In: lib/sequel/extensions/migration.rb
Parent: Migrator

The default migrator, recommended in most cases. Uses a simple incrementing version number starting with 1, where missing or duplicate migration file versions are not allowed. Part of the migration extension.

Methods

is_current?   new   run  

Constants

DEFAULT_SCHEMA_COLUMN = :version
DEFAULT_SCHEMA_TABLE = :schema_info
Error = Migrator::Error

Attributes

current  [R]  The current version for this migrator
direction  [R]  The direction of the migrator, either :up or :down
migrations  [R]  The migrations used by this migrator

Public Class methods

Set up all state for the migrator instance

[Source]

     # File lib/sequel/extensions/migration.rb, line 523
523:     def initialize(db, directory, opts=OPTS)
524:       super
525:       @current = opts[:current] || current_migration_version
526:       latest_version = latest_migration_version
527: 
528:       @target = if opts[:target]
529:         opts[:target]
530:       elsif opts[:relative]
531:         @current + opts[:relative]
532:       else
533:         latest_version
534:       end
535: 
536:       if @target > latest_version
537:         @target = latest_version
538:       elsif @target < 0
539:         @target = 0
540:       end
541: 
542:       raise(Error, "No current version available") unless current
543:       raise(Error, "No target version available, probably because no migration files found or filenames don't follow the migration filename convention") unless target
544: 
545:       @direction = current < target ? :up : :down
546:       @migrations = get_migrations
547:     end

Public Instance methods

The integer migrator is current if the current version is the same as the target version.

[Source]

     # File lib/sequel/extensions/migration.rb, line 550
550:     def is_current?
551:       current_migration_version == target
552:     end

Apply all migrations on the database

[Source]

     # File lib/sequel/extensions/migration.rb, line 555
555:     def run
556:       migrations.zip(version_numbers).each do |m, v|
557:         t = Time.now
558:         db.log_info("Begin applying migration version #{v}, direction: #{direction}")
559:         checked_transaction(m) do
560:           m.apply(db, direction)
561:           set_migration_version(up? ? v : v-1)
562:         end
563:         db.log_info("Finished applying migration version #{v}, direction: #{direction}, took #{sprintf('%0.6f', Time.now - t)} seconds")
564:       end
565:       
566:       target
567:     end

[Validate]