method
migrate
migrate()
public
Hide source
# File activerecord/lib/active_record/migration.rb, line 451 def migrate current = migrations.detect { |m| m.version == current_version } target = migrations.detect { |m| m.version == @target_version } if target.nil? && !@target_version.nil? && @target_version > 0 raise UnknownMigrationVersionError.new(@target_version) end start = up? ? 0 : (migrations.index(current) || 0) finish = migrations.index(target) || migrations.size - 1 runnable = migrations[start..finish] # skip the last migration if we're headed down, but not ALL the way down runnable.pop if down? && !target.nil? runnable.each do |migration| Base.logger.info "Migrating to #{migration.name} (#{migration.version})" # On our way up, we skip migrating the ones we've already migrated next if up? && migrated.include?(migration.version.to_i) # On our way down, we skip reverting the ones we've never migrated if down? && !migrated.include?(migration.version.to_i) migration.announce 'never migrated, skipping'; migration.write next end begin ddl_transaction do migration.migrate(@direction) record_version_state_after_migrating(migration.version) end rescue => e canceled_msg = Base.connection.supports_ddl_transactions? ? "this and " : "" raise StandardError, "An error has occurred, #{canceled_msg}all later migrations canceled:\n\n#{e}", e.backtrace end end end