diff options
Diffstat (limited to 'activerecord/lib/active_record/migration.rb')
| -rw-r--r-- | activerecord/lib/active_record/migration.rb | 244 |
1 files changed, 121 insertions, 123 deletions
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb index 1bb4688717..9206547acf 100644 --- a/activerecord/lib/active_record/migration.rb +++ b/activerecord/lib/active_record/migration.rb @@ -1,6 +1,6 @@ -require 'set' +require "set" require "active_support/core_ext/module/attribute_accessors" -require 'active_support/core_ext/regexp' +require "active_support/core_ext/regexp" module ActiveRecord class MigrationError < ActiveRecordError#:nodoc: @@ -510,8 +510,8 @@ module ActiveRecord # Remember that you can still open your own transactions, even if you # are in a Migration with <tt>self.disable_ddl_transaction!</tt>. class Migration - autoload :CommandRecorder, 'active_record/migration/command_recorder' - autoload :Compatibility, 'active_record/migration/compatibility' + autoload :CommandRecorder, "active_record/migration/command_recorder" + autoload :Compatibility, "active_record/migration/compatibility" # This must be defined before the inherited hook, below class Current < Migration # :nodoc: @@ -555,9 +555,9 @@ module ActiveRecord private - def connection - ActiveRecord::Base.connection - end + def connection + ActiveRecord::Base.connection + end end class << self @@ -830,7 +830,7 @@ module ActiveRecord end def method_missing(method, *arguments, &block) - arg_list = arguments.map(&:inspect) * ', ' + arg_list = arguments.map(&:inspect) * ", " say_with_time "#{method}(#{arg_list})" do unless connection.respond_to? :revert @@ -922,19 +922,18 @@ module ActiveRecord end private - def execute_block - if connection.respond_to? :execute_block - super # use normal delegation to record the block - else - yield + def execute_block + if connection.respond_to? :execute_block + super # use normal delegation to record the block + else + yield + end end - end end # MigrationProxy is used to defer loading of the actual migration classes # until they are needed class MigrationProxy < Struct.new(:name, :version, :filename, :scope) - def initialize(name, version, filename, scope) super @migration = nil @@ -960,7 +959,6 @@ module ActiveRecord require(File.expand_path(filename)) name.constantize.new(name, version) end - end class NullMigration < MigrationProxy #:nodoc: @@ -1052,7 +1050,7 @@ module ActiveRecord end def migrations_paths - @migrations_paths ||= ['db/migrate'] + @migrations_paths ||= ["db/migrate"] # just to not break things if someone uses: migrations_path = some_string Array(@migrations_paths) end @@ -1166,145 +1164,145 @@ module ActiveRecord private # Used for running a specific migration. - def run_without_lock - migration = migrations.detect { |m| m.version == @target_version } - raise UnknownMigrationVersionError.new(@target_version) if migration.nil? - execute_migration_in_transaction(migration, @direction) + def run_without_lock + migration = migrations.detect { |m| m.version == @target_version } + raise UnknownMigrationVersionError.new(@target_version) if migration.nil? + execute_migration_in_transaction(migration, @direction) - record_environment - end + record_environment + end # Used for running multiple migrations up to or down to a certain value. - def migrate_without_lock - if invalid_target? - raise UnknownMigrationVersionError.new(@target_version) - end + def migrate_without_lock + if invalid_target? + raise UnknownMigrationVersionError.new(@target_version) + end - runnable.each do |migration| - execute_migration_in_transaction(migration, @direction) - end + runnable.each do |migration| + execute_migration_in_transaction(migration, @direction) + end - record_environment - end + record_environment + end # Stores the current environment in the database. - def record_environment - return if down? - ActiveRecord::InternalMetadata[:environment] = ActiveRecord::Migrator.current_environment - end + def record_environment + return if down? + ActiveRecord::InternalMetadata[:environment] = ActiveRecord::Migrator.current_environment + end - def ran?(migration) - migrated.include?(migration.version.to_i) - end + def ran?(migration) + migrated.include?(migration.version.to_i) + end # Return true if a valid version is not provided. - def invalid_target? - !target && @target_version && @target_version > 0 - end + def invalid_target? + !target && @target_version && @target_version > 0 + end - def execute_migration_in_transaction(migration, direction) - return if down? && !migrated.include?(migration.version.to_i) - return if up? && migrated.include?(migration.version.to_i) + def execute_migration_in_transaction(migration, direction) + return if down? && !migrated.include?(migration.version.to_i) + return if up? && migrated.include?(migration.version.to_i) - Base.logger.info "Migrating to #{migration.name} (#{migration.version})" if Base.logger + Base.logger.info "Migrating to #{migration.name} (#{migration.version})" if Base.logger - ddl_transaction(migration) do - migration.migrate(direction) - record_version_state_after_migrating(migration.version) + ddl_transaction(migration) do + migration.migrate(direction) + record_version_state_after_migrating(migration.version) + end + rescue => e + msg = "An error has occurred, " + msg << "this and " if use_transaction?(migration) + msg << "all later migrations canceled:\n\n#{e}" + raise StandardError, msg, e.backtrace end - rescue => e - msg = "An error has occurred, " - msg << "this and " if use_transaction?(migration) - msg << "all later migrations canceled:\n\n#{e}" - raise StandardError, msg, e.backtrace - end - def target - migrations.detect { |m| m.version == @target_version } - end + def target + migrations.detect { |m| m.version == @target_version } + end - def finish - migrations.index(target) || migrations.size - 1 - end + def finish + migrations.index(target) || migrations.size - 1 + end - def start - up? ? 0 : (migrations.index(current) || 0) - end + def start + up? ? 0 : (migrations.index(current) || 0) + end - def validate(migrations) - name ,= migrations.group_by(&:name).find { |_,v| v.length > 1 } - raise DuplicateMigrationNameError.new(name) if name + def validate(migrations) + name ,= migrations.group_by(&:name).find { |_,v| v.length > 1 } + raise DuplicateMigrationNameError.new(name) if name - version ,= migrations.group_by(&:version).find { |_,v| v.length > 1 } - raise DuplicateMigrationVersionError.new(version) if version - end + version ,= migrations.group_by(&:version).find { |_,v| v.length > 1 } + raise DuplicateMigrationVersionError.new(version) if version + end - def record_version_state_after_migrating(version) - if down? - migrated.delete(version) - ActiveRecord::SchemaMigration.where(:version => version.to_s).delete_all - else - migrated << version - ActiveRecord::SchemaMigration.create!(version: version.to_s) + def record_version_state_after_migrating(version) + if down? + migrated.delete(version) + ActiveRecord::SchemaMigration.where(version: version.to_s).delete_all + else + migrated << version + ActiveRecord::SchemaMigration.create!(version: version.to_s) + end end - end - def self.last_stored_environment - return nil if current_version == 0 - raise NoEnvironmentInSchemaError unless ActiveRecord::InternalMetadata.table_exists? + def self.last_stored_environment + return nil if current_version == 0 + raise NoEnvironmentInSchemaError unless ActiveRecord::InternalMetadata.table_exists? - environment = ActiveRecord::InternalMetadata[:environment] - raise NoEnvironmentInSchemaError unless environment - environment - end + environment = ActiveRecord::InternalMetadata[:environment] + raise NoEnvironmentInSchemaError unless environment + environment + end - def self.current_environment - ActiveRecord::ConnectionHandling::DEFAULT_ENV.call - end + def self.current_environment + ActiveRecord::ConnectionHandling::DEFAULT_ENV.call + end - def self.protected_environment? - ActiveRecord::Base.protected_environments.include?(last_stored_environment) if last_stored_environment - end + def self.protected_environment? + ActiveRecord::Base.protected_environments.include?(last_stored_environment) if last_stored_environment + end - def up? - @direction == :up - end + def up? + @direction == :up + end - def down? - @direction == :down - end + def down? + @direction == :down + end # Wrap the migration in a transaction only if supported by the adapter. - def ddl_transaction(migration) - if use_transaction?(migration) - Base.transaction { yield } - else - yield + def ddl_transaction(migration) + if use_transaction?(migration) + Base.transaction { yield } + else + yield + end end - end - def use_transaction?(migration) - !migration.disable_ddl_transaction && Base.connection.supports_ddl_transactions? - end + def use_transaction?(migration) + !migration.disable_ddl_transaction && Base.connection.supports_ddl_transactions? + end - def use_advisory_lock? - Base.connection.supports_advisory_locks? - end + def use_advisory_lock? + Base.connection.supports_advisory_locks? + end - def with_advisory_lock - lock_id = generate_migrator_advisory_lock_id - got_lock = Base.connection.get_advisory_lock(lock_id) - raise ConcurrentMigrationError unless got_lock - load_migrated # reload schema_migrations to be sure it wasn't changed by another process before we got the lock - yield - ensure - Base.connection.release_advisory_lock(lock_id) if got_lock - end + def with_advisory_lock + lock_id = generate_migrator_advisory_lock_id + got_lock = Base.connection.get_advisory_lock(lock_id) + raise ConcurrentMigrationError unless got_lock + load_migrated # reload schema_migrations to be sure it wasn't changed by another process before we got the lock + yield + ensure + Base.connection.release_advisory_lock(lock_id) if got_lock + end - MIGRATOR_SALT = 2053462845 - def generate_migrator_advisory_lock_id - db_name_hash = Zlib.crc32(Base.connection.current_database) - MIGRATOR_SALT * db_name_hash - end + MIGRATOR_SALT = 2053462845 + def generate_migrator_advisory_lock_id + db_name_hash = Zlib.crc32(Base.connection.current_database) + MIGRATOR_SALT * db_name_hash + end end end |