class Sequel::TimestampMigrator

  1. lib/sequel/extensions/migration.rb
Parent: Sequel

The migrator used if any migration file version appears to be a timestamp. Stores filenames of migration files, and can figure out which migrations have not been applied and apply them, even if earlier migrations are added after later migrations. If you plan to do that, the responsibility is on you to make sure the migrations don’t conflict. Part of the migration extension.

Methods

Public Class

  1. new

Public Instance

  1. applied_migrations
  2. is_current?
  3. migration_tuples
  4. run

Constants

DEFAULT_SCHEMA_COLUMN = :filename  
DEFAULT_SCHEMA_TABLE = :schema_migrations  
Error = Migrator::Error  

Attributes

applied_migrations [R]

Array of strings of applied migration filenames
migration_tuples [R]

Get tuples of migrations, filenames, and actions for each migration

Public Class methods

new (db, directory, opts=OPTS)

Set up all state for the migrator instance

[show source] 
# File lib/sequel/extensions/migration.rb, line 630
def initialize(db, directory, opts=OPTS)
  super
  @target = opts[:target]
  @applied_migrations = get_applied_migrations
  @migration_tuples = get_migration_tuples
end

Public Instance methods

is_current? ()

The timestamp migrator is current if there are no migrations to apply in either direction.

[show source] 
# File lib/sequel/extensions/migration.rb, line 639
def is_current?
  migration_tuples.empty?
end
run ()

Apply all migration tuples on the database

[show source] 
# File lib/sequel/extensions/migration.rb, line 644
def run
  migration_tuples.each do |m, f, direction|
    t = Time.now
    db.log_info("Begin applying migration #{f}, direction: #{direction}")
    checked_transaction(m) do
      m.apply(db, direction)
      fi = f.downcase
      direction == :up ? ds.insert(column=>fi) : ds.filter(column=>fi).delete
    end
    db.log_info("Finished applying migration #{f}, direction: #{direction}, took #{sprintf('%0.6f', Time.now - t)} seconds")
  end
  nil
end