class Sequel::TimestampMigrator
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.
Constants
- DEFAULT_SCHEMA_COLUMN
- DEFAULT_SCHEMA_TABLE
- Error
Attributes
Array of strings of applied migration filenames
Get tuples of migrations, filenames, and actions for each migration
Public Class Methods
Set up all state for the migrator instance
# File lib/sequel/extensions/migration.rb, line 635 def initialize(db, directory, opts=OPTS) super @target = opts[:target] @applied_migrations = get_applied_migrations @migration_tuples = get_migration_tuples end
Public Instance Methods
The timestamp migrator is current if there are no migrations to apply in either direction.
# File lib/sequel/extensions/migration.rb, line 644 def is_current? migration_tuples.empty? end
Apply all migration tuples on the database
# File lib/sequel/extensions/migration.rb, line 649 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
Private Instance Methods
Convert the schema_info table to the new schema_migrations table format, using the version of the schema_info table and the current migration files.
# File lib/sequel/extensions/migration.rb, line 667 def convert_from_schema_info v = db[IntegerMigrator::DEFAULT_SCHEMA_TABLE].get(IntegerMigrator::DEFAULT_SCHEMA_COLUMN) ds = db.from(table) files.each do |path| f = File.basename(path) if migration_version_from_file(f) <= v ds.insert(column=>f) end end end
Returns filenames of all applied migrations
# File lib/sequel/extensions/migration.rb, line 679 def get_applied_migrations am = ds.select_order_map(column) missing_migration_files = am - files.map{|f| File.basename(f).downcase} raise(Error, "Applied migration files not in file system: #{missing_migration_files.join(', ')}") if missing_migration_files.length > 0 && !@allow_missing_migration_files am end
Returns any migration files found in the migrator's directory.
# File lib/sequel/extensions/migration.rb, line 687 def get_migration_files files = [] Dir.new(directory).each do |file| next unless MIGRATION_FILE_PATTERN.match(file) files << File.join(directory, file) end files.sort_by{|f| MIGRATION_FILE_PATTERN.match(File.basename(f))[1].to_i} end
Returns tuples of migration, filename, and direction
# File lib/sequel/extensions/migration.rb, line 697 def get_migration_tuples remove_migration_classes up_mts = [] down_mts = [] ms = Migration.descendants files.each do |path| f = File.basename(path) fi = f.downcase if target if migration_version_from_file(f) > target if applied_migrations.include?(fi) load(path) down_mts << [ms.last, f, :down] end elsif !applied_migrations.include?(fi) load(path) up_mts << [ms.last, f, :up] end elsif !applied_migrations.include?(fi) load(path) up_mts << [ms.last, f, :up] end end up_mts + down_mts.reverse end
Returns the dataset for the schema_migrations table. If no such table exists, it is automatically created.
# File lib/sequel/extensions/migration.rb, line 725 def schema_dataset c = column ds = db.from(table) if !db.table_exists?(table) db.create_table(table){String c, :primary_key=>true} if db.table_exists?(:schema_info) and vha = db[:schema_info].all and vha.length == 1 and vha.first.keys == [:version] and vha.first.values.first.is_a?(Integer) convert_from_schema_info end elsif !ds.columns.include?(c) raise(Error, "Migrator table #{table} does not contain column #{c}") end ds end