### Home Classes Methods

### In Files

- lib/sequel/extensions/migration.rb

### Parent

Sequel::Migrator

### Methods

- ::new
- #convert_from_schema_info
- #get_applied_migrations
- #get_migration_files
- #get_migration_tuples
- #run
- #schema_dataset

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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Quicksearch

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No matching classes.

# 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

applied_migrations[R]

Array of strings of applied migration filenames

migration_tuples[R]

Get tuples of migrations, filenames, and actions for each migration

### Public Class Methods

new(db, directory, opts={}) click to toggle source

Set up all state for the migrator instance

         # File lib/sequel/extensions/migration.rb, line 579
    579:     def initialize(db, directory, opts={})
    580:       super
    581:       @target = opts[:target]
    582:       @applied_migrations = get_applied_migrations
    583:       @migration_tuples = get_migration_tuples
    584:     end

### Public Instance Methods

run() click to toggle source

Apply all migration tuples on the database

         # File lib/sequel/extensions/migration.rb, line 587
    587:     def run
    588:       migration_tuples.each do |m, f, direction|
    589:         t = Time.now
    590:         db.log_info("Begin applying migration #{f}, direction: #{direction}")
    591:         checked_transaction(m) do
    592:           m.apply(db, direction)
    593:           fi = f.downcase
    594:           direction == :up ? ds.insert(column=>fi) : ds.filter(column=>fi).delete
    595:         end
    596:         db.log_info("Finished applying migration #{f}, direction: #{direction}, took #{sprintf('%0.6f', Time.now - t)} seconds")
    597:       end
    598:       nil
    599:     end

### Private Instance Methods

convert_from_schema_info() click to toggle source

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 605
    605:     def convert_from_schema_info
    606:       v = db[IntegerMigrator::DEFAULT_SCHEMA_TABLE].get(IntegerMigrator::DEFAULT_SCHEMA_COLUMN)
    607:       ds = db.from(table)
    608:       files.each do |path|
    609:         f = File.basename(path)
    610:         if migration_version_from_file(f) <= v
    611:           ds.insert(column=>f)
    612:         end
    613:       end
    614:     end

get_applied_migrations() click to toggle source

Returns filenames of all applied migrations

         # File lib/sequel/extensions/migration.rb, line 617
    617:     def get_applied_migrations
    618:       am = ds.select_order_map(column)
    619:       missing_migration_files = am - files.map{|f| File.basename(f).downcase}
    620:       raise(Error, "Applied migration files not in file system: #{missing_migration_files.join(', ')}") if missing_migration_files.length > 0
    621:       am
    622:     end

get_migration_files() click to toggle source

Returns any migration files found in the migrator’s directory.

         # File lib/sequel/extensions/migration.rb, line 625
    625:     def get_migration_files
    626:       files = []
    627:       Dir.new(directory).each do |file|
    628:         next unless MIGRATION_FILE_PATTERN.match(file)
    629:         files << File.join(directory, file)
    630:       end
    631:       files.sort_by{|f| MIGRATION_FILE_PATTERN.match(File.basename(f))[1].to_i}
    632:     end

get_migration_tuples() click to toggle source

Returns tuples of migration, filename, and direction

         # File lib/sequel/extensions/migration.rb, line 635
    635:     def get_migration_tuples
    636:       remove_migration_classes
    637:       up_mts = []
    638:       down_mts = []
    639:       ms = Migration.descendants
    640:       files.each do |path|
    641:         f = File.basename(path)
    642:         fi = f.downcase
    643:         if target
    644:           if migration_version_from_file(f) > target
    645:             if applied_migrations.include?(fi)
    646:               load(path)
    647:               down_mts << [ms.last, f, :down]
    648:             end
    649:           elsif !applied_migrations.include?(fi)
    650:             load(path)
    651:             up_mts << [ms.last, f, :up]
    652:           end
    653:         elsif !applied_migrations.include?(fi)
    654:           load(path)
    655:           up_mts << [ms.last, f, :up]
    656:         end
    657:       end
    658:       up_mts + down_mts.reverse
    659:     end

schema_dataset() click to toggle source

Returns the dataset for the schema_migrations table. If no such table exists, it is automatically created.

         # File lib/sequel/extensions/migration.rb, line 663
    663:     def schema_dataset
    664:       c = column
    665:       ds = db.from(table)
    666:       if !db.table_exists?(table)
    667:         db.create_table(table){String c, :primary_key=>true}
    668:         if db.table_exists?(:schema_info) and vha = db[:schema_info].all and vha.length == 1 and
    669:            vha.first.keys == [:version] and vha.first.values.first.is_a?(Integer)
    670:           convert_from_schema_info
    671:         end
    672:       elsif !ds.columns.include?(c)
    673:         raise(Error, "Migrator table #{table} does not contain column #{c}")
    674:       end
    675:       ds
    676:     end

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