Module: PgHaMigrations

Defined in:
lib/pg_ha_migrations.rb,
lib/pg_ha_migrations/version.rb,
lib/pg_ha_migrations/hacks/disable_ddl_transaction.rb,
lib/pg_ha_migrations/blocking_database_transactions.rb,
lib/pg_ha_migrations/hacks/cleanup_unnecessary_output.rb,
lib/pg_ha_migrations/blocking_database_transactions_reporter.rb

Defined Under Namespace

Modules: ActiveRecordHacks, AllowedVersions, AutoIncluder, DependentObjectsChecks, SafeStatements, UnsafeStatements Classes: BlockingDatabaseTransactions, BlockingDatabaseTransactionsReporter, Config, Railtie

Constant Summary collapse

LOCK_TIMEOUT_SECONDS = 
5
LOCK_FAILURE_RETRY_DELAY_MULTLIPLIER = 
5
UnsafeMigrationError =

Safe versus unsafe in this context specifically means the following:

  • Safe operations will not block for long periods of time.

  • Unsafe operations may block for long periods of time.

Class.new(StandardError)
InvalidMigrationError =

Invalid migrations are operations which we expect to not function as expected or get the schema into an inconsistent state

Class.new(StandardError)
BestPracticeError =

Operations violating a best practice, but not actually unsafe will raise this error. For example, adding a column without a default and then setting its default in a second action in a single migration isn’t our documented best practice and will raise this error.

Class.new(Exception)
UnsupportedMigrationError =

Unsupported migrations use ActiveRecord::Migration features that we don’t support, and therefore will likely have unexpected behavior.

Class.new(StandardError)
UnsupportedAdapter =

This gem only supports the PostgreSQL adapter at this time.

Class.new(StandardError)
VERSION = 
"1.4.0"

Class Method Summary collapse

Class Method Details

.config ⇒ Object 



15
16
17
18
19
20
21
22
 
# File 'lib/pg_ha_migrations.rb', line 15

def self.config
  @config ||= Config.new(
    true,
    false,
    true,
    false
  )
end

.configure {|config| ... } ⇒ Object

Yields:



24
25
26
 
# File 'lib/pg_ha_migrations.rb', line 24

def self.configure
  yield config
end