### Home Classes Methods

### In Files

- lib/sequel/extensions/migration.rb

### Parent

Sequel::Migrator

### Methods

- ::new
- #current_migration_version
- #get_migration_files
- #get_migrations
- #latest_migration_version
- #run
- #schema_dataset
- #set_migration_version
- #up?
- #version_numbers

### 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

### Class Index

Quicksearch

- Sequel
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- Sequel::Plugins::ManyThroughMany::ClassMethods
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- Sequel::Plugins::NestedAttributes
- Sequel::Plugins::NestedAttributes::ClassMethods
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- Sequel::Plugins::OptimisticLocking
- Sequel::Plugins::OptimisticLocking::ClassMethods
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- Sequel::Plugins::PreparedStatementsAssociations::ClassMethods
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- Sequel::Plugins::PreparedStatementsWithPk
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- Sequel::Plugins::Serialization::InstanceMethods
- Sequel::Plugins::SerializationModificationDetection
- Sequel::Plugins::SerializationModificationDetection::InstanceMethods
- Sequel::Plugins::Sharding
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- Sequel::Plugins::Sharding::DatasetMethods
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- Sequel::Plugins::SingleTableInheritance::ClassMethods
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- Sequel::Plugins::SkipCreateRefresh
- Sequel::Plugins::SkipCreateRefresh::InstanceMethods
- Sequel::Plugins::StringStripper
- Sequel::Plugins::StringStripper::InstanceMethods
- Sequel::Plugins::Subclasses
- Sequel::Plugins::Subclasses::ClassMethods
- Sequel::Plugins::TacticalEagerLoading
- Sequel::Plugins::TacticalEagerLoading::DatasetMethods
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- Sequel::Plugins::Timestamps::InstanceMethods
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- Sequel::Plugins::Tree
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- Sequel::Plugins::Tree::InstanceMethods
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- Sequel::Plugins::Tree::SingleRoot::InstanceMethods
- Sequel::Plugins::Tree::TreeMultipleRootError
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- Sequel::Plugins::ValidationClassMethods::ClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods::Generator
- Sequel::Plugins::ValidationClassMethods::InstanceMethods
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- Sequel::PoolTimeout
- Sequel::PoolTimeout
- Sequel::Postgres
- Sequel::Postgres::AdapterMethods
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- Sequel::Postgres::DatasetMethods
- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
- Sequel::PrettyTable
- Sequel::Progress
- Sequel::Progress::DatabaseMethods
- Sequel::Progress::DatasetMethods
- Sequel::Qualifier
- Sequel::Rollback
- Sequel::Rollback
- Sequel::SQL
- Sequel::SQL::AliasMethods
- Sequel::SQL::AliasedExpression
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- Sequel::SQL::Blob
- Sequel::SQL::BooleanConstant
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- Sequel::SQL::BooleanMethods
- Sequel::SQL::CaseExpression
- Sequel::SQL::Cast
- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
- Sequel::SQL::ComplexExpression
- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::Expression
- Sequel::SQL::Function
- Sequel::SQL::GenericComplexExpression
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- Sequel::SQL::Identifier
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- Sequel::SQL::InequalityMethods
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- Sequel::SQL::JoinOnClause
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- Sequel::SQL::OrderedExpression
- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
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- Sequel::SQL::StringExpression
- Sequel::SQL::StringMethods
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- Sequel::SQL::SubscriptMethods
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- Sequel::SQL::ValueList
- Sequel::SQL::VirtualRow
- Sequel::SQL::Window
- Sequel::SQL::WindowFunction
- Sequel::SQLTime
- Sequel::SQLite
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- Sequel::SQLite::DatasetMethods
- Sequel::Schema
- Sequel::Schema::AlterTableGenerator
- Sequel::Schema::Generator
- Sequel::ServerBlock
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- Sequel::SingleConnectionPool
- Sequel::Swift
- Sequel::Swift::Database
- Sequel::Swift::Dataset
- Sequel::Swift::MySQL
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- Sequel::Swift::MySQL::Dataset
- Sequel::Swift::Postgres
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- Sequel::Swift::Postgres::DatabaseMethods
- Sequel::Swift::Postgres::Dataset
- Sequel::Swift::SQLite
- Sequel::Swift::SQLite::DatabaseMethods
- Sequel::Swift::SQLite::Dataset
- Sequel::ThreadLocalTimezones
- Sequel::ThreadedConnectionPool
- Sequel::ThreadedServerBlock
- Sequel::TimestampMigrator
- Sequel::Timezones
- Sequel::TinyTDS
- Sequel::TinyTDS::Database
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- Sequel::TinyTDS::Dataset::ArgumentMapper
- Sequel::TinyTDS::Dataset::PreparedStatementMethods
- Sequel::ToDot
- Sequel::UnbindDuplicate
- Sequel::Unbinder
- Sequel::UndefinedAssociation
- Sequel::UnthreadedServerBlock
- Sequel::ValidationFailed
- Dataset
- Dataset::ArgumentMapper
- Dataset::BindArgumentMethods
- Dataset::PreparedStatementMethods
- String
- String::Inflections
- Array
- FalseClass
- Hash
- NilClass
- Numeric
- Object
- PGconn
- PGresult
- Proc
- Symbol
- TrueClass

No matching classes.

# Sequel::IntegerMigrator

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.

### Constants

DEFAULT_SCHEMA_COLUMN
DEFAULT_SCHEMA_TABLE
Error

### Attributes

current[R]

The current version for this migrator

direction[R]

The direction of the migrator, either :up or :down

migrations[R]

The migrations used by this migrator

### 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 457
    457:     def initialize(db, directory, opts={})
    458:       super
    459:       @target = opts[:target] || latest_migration_version
    460:       @current = opts[:current] || current_migration_version
    461:
    462:       raise(Error, "No current version available") unless current
    463:       raise(Error, "No target version available, probably because no migration files found or filenames don't follow the migration filename convention") unless target
    464:
    465:       @direction = current < target ? :up : :down
    466:       @migrations = get_migrations
    467:     end

### Public Instance Methods

run() click to toggle source

Apply all migrations on the database

         # File lib/sequel/extensions/migration.rb, line 470
    470:     def run
    471:       migrations.zip(version_numbers).each do |m, v|
    472:         t = Time.now
    473:         lv = up? ? v : v + 1
    474:         db.log_info("Begin applying migration version #{lv}, direction: #{direction}")
    475:         checked_transaction(m) do
    476:           m.apply(db, direction)
    477:           set_migration_version(v)
    478:         end
    479:         db.log_info("Finished applying migration version #{lv}, direction: #{direction}, took #{sprintf('%0.6f', Time.now - t)} seconds")
    480:       end
    481:
    482:       target
    483:     end

### Private Instance Methods

current_migration_version() click to toggle source

Gets the current migration version stored in the database. If no version number is stored, 0 is returned.

         # File lib/sequel/extensions/migration.rb, line 489
    489:     def current_migration_version
    490:       ds.get(column) || 0
    491:     end

get_migration_files() click to toggle source

Returns any found migration files in the supplied directory.

         # File lib/sequel/extensions/migration.rb, line 494
    494:     def get_migration_files
    495:       files = []
    496:       Dir.new(directory).each do |file|
    497:         next unless MIGRATION_FILE_PATTERN.match(file)
    498:         version = migration_version_from_file(file)
    499:         if version >= 20000101
    500:           raise Migrator::Error, "Migration number too large, must use TimestampMigrator: #{file}"
    501:         end
    502:         raise(Error, "Duplicate migration version: #{version}") if files[version]
    503:         files[version] = File.join(directory, file)
    504:       end
    505:       1.upto(files.length - 1){|i| raise(Error, "Missing migration version: #{i}") unless files[i]}
    506:       files
    507:     end

get_migrations() click to toggle source

Returns a list of migration classes filtered for the migration range and ordered according to the migration direction.

         # File lib/sequel/extensions/migration.rb, line 511
    511:     def get_migrations
    512:       remove_migration_classes
    513:
    514:       # load migration files
    515:       files[up? ? (current + 1)..target : (target + 1)..current].compact.each{|f| load(f)}
    516:
    517:       # get migration classes
    518:       classes = Migration.descendants
    519:       up? ? classes : classes.reverse
    520:     end

latest_migration_version() click to toggle source

Returns the latest version available in the specified directory.

         # File lib/sequel/extensions/migration.rb, line 523
    523:     def latest_migration_version
    524:       l = files.last
    525:       l ? migration_version_from_file(File.basename(l)) : nil
    526:     end

schema_dataset() click to toggle source

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

         # File lib/sequel/extensions/migration.rb, line 530
    530:     def schema_dataset
    531:       c = column
    532:       ds = db.from(table)
    533:       if !db.table_exists?(table)
    534:         db.create_table(table){Integer c, :default=>0, :null=>false}
    535:       elsif !ds.columns.include?(c)
    536:         db.alter_table(table){add_column c, Integer, :default=>0, :null=>false}
    537:       end
    538:       ds.insert(c=>0) if ds.empty?
    539:       raise(Error, "More than 1 row in migrator table") if ds.count > 1
    540:       ds
    541:     end

set_migration_version(version) click to toggle source

Sets the current migration version stored in the database.

         # File lib/sequel/extensions/migration.rb, line 544
    544:     def set_migration_version(version)
    545:       ds.update(column=>version)
    546:     end

up?() click to toggle source

Whether or not this is an up migration

         # File lib/sequel/extensions/migration.rb, line 549
    549:     def up?
    550:       direction == :up
    551:     end

version_numbers() click to toggle source

An array of numbers corresponding to the migrations, so that each number in the array is the migration version that will be in affect after the migration is run.

         # File lib/sequel/extensions/migration.rb, line 556
    556:     def version_numbers
    557:       up? ? ((current+1)..target).to_a : (target..(current - 1)).to_a.reverse
    558:     end

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