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.
Set up all state for the migrator instance
# File lib/sequel/extensions/migration.rb, line 505 def initialize(db, directory, opts={}) super @target = opts[:target] || latest_migration_version @current = opts[:current] || current_migration_version raise(Error, "No current version available") unless current raise(Error, "No target version available, probably because no migration files found or filenames don't follow the migration filename convention") unless target @direction = current < target ? :up : :down @migrations = get_migrations end
The integer migrator is current if the current version is the same as the target version.
# File lib/sequel/extensions/migration.rb, line 518 def is_current? current_migration_version == target end
Apply all migrations on the database
# File lib/sequel/extensions/migration.rb, line 523 def run migrations.zip(version_numbers).each do |m, v| t = Time.now lv = up? ? v : v + 1 db.log_info("Begin applying migration version #{lv}, direction: #{direction}") checked_transaction(m) do m.apply(db, direction) set_migration_version(v) end db.log_info("Finished applying migration version #{lv}, direction: #{direction}, took #{sprintf('%0.6f', Time.now - t)} seconds") end target end
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