Module: Switchman::ActiveRecord::Migrator

Defined in:
lib/switchman/active_record/migration.rb

Instance Method Summary collapse

Instance Method Details

#generate_migrator_advisory_lock_id ⇒ Object

significant change: use the shard name instead of the database name in the lock id. Especially if you’re going through pgbouncer, the database name you’re accessing may not be consistent



28
29
30
31
32
33
34
 
# File 'lib/switchman/active_record/migration.rb', line 28

def generate_migrator_advisory_lock_id
  db_name_hash = Zlib.crc32(Shard.current.name)
  shard_name_hash = ::ActiveRecord::Migrator::MIGRATOR_SALT * db_name_hash
  # Store in internalmetadata to allow other tools to be able to lock out migrations
  @internal_metadata[:migrator_advisory_lock_id] = shard_name_hash.to_s
  shard_name_hash
end

#use_advisory_lock? ⇒ Boolean

Returns:

  • (Boolean) 


36
37
38
 
# File 'lib/switchman/active_record/migration.rb', line 36

def use_advisory_lock?
  super && pending_migrations.any?
end