Class: ActiveRecord::Migrator

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/migration.rb

Overview

:nodoc:

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(direction, migrations, schema_migration, target_version = nil) ⇒ Migrator

Returns a new instance of Migrator.



1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
 
# File 'lib/active_record/migration.rb', line 1249

def initialize(direction, migrations, schema_migration, target_version = nil)
  @direction         = direction
  @target_version    = target_version
  @migrated_versions = nil
  @migrations        = migrations
  @schema_migration  = schema_migration

  validate(@migrations)

  @schema_migration.create_table
  ActiveRecord::InternalMetadata.create_table
end

Class Attribute Details

.migrations_paths ⇒ Object

Returns the value of attribute migrations_paths.



1239
1240
1241
 
# File 'lib/active_record/migration.rb', line 1239

def migrations_paths
  @migrations_paths
end

Class Method Details

.current_version ⇒ Object

For cases where a table doesn't exist like loading from schema cache



1242
1243
1244
 
# File 'lib/active_record/migration.rb', line 1242

def current_version
  MigrationContext.new(migrations_paths, SchemaMigration).current_version
end

Instance Method Details

#current_migration ⇒ Object Also known as: current 



1266
1267
1268
 
# File 'lib/active_record/migration.rb', line 1266

def current_migration
  migrations.detect { |m| m.version == current_version }
end

#current_version ⇒ Object 



1262
1263
1264
 
# File 'lib/active_record/migration.rb', line 1262

def current_version
  migrated.max || 0
end

#load_migrated ⇒ Object 



1311
1312
1313
 
# File 'lib/active_record/migration.rb', line 1311

def load_migrated
  @migrated_versions = Set.new(@schema_migration.all_versions.map(&:to_i))
end

#migrate ⇒ Object 



1279
1280
1281
1282
1283
1284
1285
 
# File 'lib/active_record/migration.rb', line 1279

def migrate
  if use_advisory_lock?
    with_advisory_lock { migrate_without_lock }
  else
    migrate_without_lock
  end
end

#migrated ⇒ Object 



1307
1308
1309
 
# File 'lib/active_record/migration.rb', line 1307

def migrated
  @migrated_versions || load_migrated
end

#migrations ⇒ Object 



1298
1299
1300
 
# File 'lib/active_record/migration.rb', line 1298

def migrations
  down? ? @migrations.reverse : @migrations.sort_by(&:version)
end

#pending_migrations ⇒ Object 



1302
1303
1304
1305
 
# File 'lib/active_record/migration.rb', line 1302

def pending_migrations
  already_migrated = migrated
  migrations.reject { |m| already_migrated.include?(m.version) }
end

#run ⇒ Object 



1271
1272
1273
1274
1275
1276
1277
 
# File 'lib/active_record/migration.rb', line 1271

def run
  if use_advisory_lock?
    with_advisory_lock { run_without_lock }
  else
    run_without_lock
  end
end

#runnable ⇒ Object 



1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
 
# File 'lib/active_record/migration.rb', line 1287

def runnable
  runnable = migrations[start..finish]
  if up?
    runnable.reject { |m| ran?(m) }
  else
    # skip the last migration if we're headed down, but not ALL the way down
    runnable.pop if target
    runnable.find_all { |m| ran?(m) }
  end
end