Module: ActiveRecord::Acts::Versioned::Behaviors::ClassMethods

Defined in:
lib/acts_as_versioned.rb

Instance Method Summary collapse

Instance Method Details

#create_versioned_table(create_table_options = {}) ⇒ Object

Rake migration task to create the versioned table using options passed to acts_as_versioned



423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
 
# File 'lib/acts_as_versioned.rb', line 423

def create_versioned_table(create_table_options = {})
  # create version column in main table if it does not exist
  if !self.content_columns.find { |c| [version_column.to_s, 'lock_version'].include? c.name }
    self.connection.add_column table_name, version_column, :integer
    self.reset_column_information
  end

  return if connection.table_exists?(versioned_table_name)

  self.connection.create_table(versioned_table_name, create_table_options) do |t|
    t.column versioned_foreign_key, :integer
    t.column version_column, :integer
  end

  self.versioned_columns.each do |col|
    self.connection.add_column versioned_table_name, col.name, col.type,
                               :limit     => col.limit,
                               :default   => col.default,
                               :scale     => col.scale,
                               :precision => col.precision
  end

  if type_col = self.columns_hash[inheritance_column]
    self.connection.add_column versioned_table_name, versioned_inheritance_column, type_col.type,
                               :limit     => type_col.limit,
                               :default   => type_col.default,
                               :scale     => type_col.scale,
                               :precision => type_col.precision
  end

  # Limit index name length to 63, the Postgresql limit of NAMEDATALEN-1.
  name = 'index_' + versioned_table_name + '_on_' + versioned_foreign_key
  self.connection.add_index versioned_table_name, versioned_foreign_key, :name => name[0,63]
end

#drop_versioned_table ⇒ Object

Rake migration task to drop the versioned table



459
460
461
 
# File 'lib/acts_as_versioned.rb', line 459

def drop_versioned_table
  self.connection.drop_table versioned_table_name
end

#versioned_class ⇒ Object

Returns an instance of the dynamic versioned model



418
419
420
 
# File 'lib/acts_as_versioned.rb', line 418

def versioned_class
  const_get versioned_class_name
end

#versioned_columns ⇒ Object

Returns an array of columns that are versioned. See non_versioned_columns



413
414
415
 
# File 'lib/acts_as_versioned.rb', line 413

def versioned_columns
  @versioned_columns ||= columns.select { |c| !non_versioned_columns.include?(c.name) }
end

#without_locking(&block) ⇒ Object

Turns off optimistic locking for the duration of the block

Foo.without_locking do
  @foo.save
end



491
492
493
494
495
496
497
498
499
 
# File 'lib/acts_as_versioned.rb', line 491

def without_locking(&block)
  current = ActiveRecord::Base.lock_optimistically
  ActiveRecord::Base.lock_optimistically = false if current
  begin
    block.call
  ensure
    ActiveRecord::Base.lock_optimistically = true if current
  end
end

#without_revision(&block) ⇒ Object

Executes the block with the versioning callbacks disabled.

Foo.without_revision do
  @foo.save
end



469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
 
# File 'lib/acts_as_versioned.rb', line 469

def without_revision(&block)
  class_eval do
    CALLBACKS.each do |attr_name|
      alias_method "orig_#{attr_name}".to_sym, attr_name
      alias_method attr_name, :empty_callback
    end
  end
  block.call
ensure
  class_eval do
    CALLBACKS.each do |attr_name|
      alias_method attr_name, "orig_#{attr_name}".to_sym
    end
  end
end