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 422 def initialize(db, directory, opts={}) super @target = opts[:target] @applied_migrations = get_applied_migrations @migration_tuples = get_migration_tuples end
Apply all migration tuples on the database
# File lib/sequel/extensions/migration.rb, line 430 def run migration_tuples.each do |m, f, direction| t = Time.now db.log_info("Begin applying migration #{f}, direction: #{direction}") db.transaction 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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