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.
Set up all state for the migrator instance
# File lib/sequel/extensions/migration.rb, line 631 def initialize(db, directory, opts={}) super @target = opts[:target] @applied_migrations = get_applied_migrations @migration_tuples = get_migration_tuples end
The timestamp migrator is current if there are no migrations to apply in either direction.
# File lib/sequel/extensions/migration.rb, line 640 def is_current? migration_tuples.empty? end
Apply all migration tuples on the database
# File lib/sequel/extensions/migration.rb, line 645 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
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