Class: BigRecord::Migrator
Overview
:nodoc:
Class Method Summary
- + (Object) current_version
- + (Object) down(migrations_path, target_version = nil)
- + (Object) get_all_versions
- + (Object) migrate(migrations_path, target_version = nil)
- + (Object) proper_table_name(name)
- + (Object) rollback(migrations_path, steps = 1)
- + (Object) run(direction, migrations_path, target_version)
- + (Object) schema_migrations_table_name
- + (Object) up(migrations_path, target_version = nil)
Instance Method Summary
- - (Object) current_migration
- - (Object) current_version
-
- (Migrator) initialize(direction, migrations_path, target_version = nil)
constructor
A new instance of Migrator.
- - (Object) migrate
- - (Object) migrated
- - (Object) migrations
- - (Object) pending_migrations
- - (Object) run
Constructor Details
- (Migrator) initialize(direction, migrations_path, target_version = nil)
A new instance of Migrator
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# File 'lib/big_record/migration.rb', line 250 def initialize(direction, migrations_path, target_version = nil) raise StandardError.new("This database does not yet support migrations") unless Base.connection.supports_migrations? Base.connection.initialize_schema_migrations_table @direction, @migrations_path, @target_version = direction, migrations_path, target_version end |
Class Method Details
+ (Object) current_version
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# File 'lib/big_record/migration.rb', line 235 def current_version sm_table = schema_migrations_table_name if Base.connection.table_exists?(sm_table) get_all_versions.max || 0 else 0 end end |
+ (Object) down(migrations_path, target_version = nil)
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# File 'lib/big_record/migration.rb', line 219 def down(migrations_path, target_version = nil) self.new(:down, migrations_path, target_version).migrate end |
+ (Object) get_all_versions
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# File 'lib/big_record/migration.rb', line 231 def get_all_versions Base.connection.get_all_schema_versions.sort end |
+ (Object) migrate(migrations_path, target_version = nil)
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# File 'lib/big_record/migration.rb', line 197 def migrate(migrations_path, target_version = nil) case when target_version.nil? then up(migrations_path, target_version) when current_version > target_version then down(migrations_path, target_version) else up(migrations_path, target_version) end end |
+ (Object) proper_table_name(name)
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# File 'lib/big_record/migration.rb', line 244 def proper_table_name(name) # Use the Active Record objects own table_name, or pre/suffix from ActiveRecord::Base if name is a symbol/string name.table_name rescue "#{BigRecord::Base.table_name_prefix}#{name}#{BigRecord::Base.table_name_suffix}" end |
+ (Object) rollback(migrations_path, steps = 1)
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# File 'lib/big_record/migration.rb', line 205 def rollback(migrations_path, steps=1) migrator = self.new(:down, migrations_path) start_index = migrator.migrations.index(migrator.current_migration) return unless start_index finish = migrator.migrations[start_index + steps] down(migrations_path, finish ? finish.version : 0) end |
+ (Object) run(direction, migrations_path, target_version)
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# File 'lib/big_record/migration.rb', line 223 def run(direction, migrations_path, target_version) self.new(direction, migrations_path, target_version).run end |
+ (Object) schema_migrations_table_name
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# File 'lib/big_record/migration.rb', line 227 def schema_migrations_table_name Base.table_name_prefix + 'schema_migrations' + Base.table_name_suffix end |
+ (Object) up(migrations_path, target_version = nil)
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# File 'lib/big_record/migration.rb', line 215 def up(migrations_path, target_version = nil) self.new(:up, migrations_path, target_version).migrate end |
Instance Method Details
- (Object) current_migration
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# File 'lib/big_record/migration.rb', line 260 def current_migration migrations.detect { |m| m.version == current_version } end |
- (Object) current_version
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# File 'lib/big_record/migration.rb', line 256 def current_version migrated.last || 0 end |
- (Object) migrate
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# File 'lib/big_record/migration.rb', line 273 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) (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 |
- (Object) migrated
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# File 'lib/big_record/migration.rb', line 347 def migrated @migrated_versions ||= self.class.get_all_versions end |
- (Object) migrations
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# File 'lib/big_record/migration.rb', line 312 def migrations @migrations ||= begin files = Dir["#{@migrations_path}/[0-9]*_*.rb"] migrations = files.inject([]) do |klasses, file| version, name = file.scan(/([0-9]+)_([_a-z0-9]*).rb/).first raise IllegalMigrationNameError.new(file) unless version version = version.to_i if klasses.detect { |m| m.version == version } raise DuplicateMigrationVersionError.new(version) end if klasses.detect { |m| m.name == name.camelize } raise DuplicateMigrationNameError.new(name.camelize) end migration = MigrationProxy.new migration.name = name.camelize migration.version = version migration.filename = file klasses << migration end migrations = migrations.sort_by(&:version) down? ? migrations.reverse : migrations end end |
- (Object) pending_migrations
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# File 'lib/big_record/migration.rb', line 342 def pending_migrations already_migrated = migrated migrations.reject { |m| already_migrated.include?(m.version.to_i) } end |
- (Object) run
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# File 'lib/big_record/migration.rb', line 264 def run target = migrations.detect { |m| m.version == @target_version } raise UnknownMigrationVersionError.new(@target_version) if target.nil? unless (up? && migrated.include?(target.version.to_i)) || (down? && !migrated.include?(target.version.to_i)) target.migrate(@direction) (target.version) end end |