Stores the enabled/disabled state of individual observers for a particular model class.

Methods
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Attributes
[R] model_class
Class Public methods
new(model_class, *args)

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 8
def initialize(model_class, *args)
  @model_class = model_class
  super(*args)
end
Instance Public methods
disable(*observers, &block)

Disables one or more observers. This supports multiple forms:

ORM.observers.disable :user_observer
  # => disables the UserObserver

User.observers.disable AuditTrail
  # => disables the AuditTrail observer for User notifications.
  #    Other models will still notify the AuditTrail observer.

ORM.observers.disable :observer_1, :observer_2
  # => disables Observer1 and Observer2 for all models.

ORM.observers.disable :all
  # => disables all observers for all models.

User.observers.disable :all do
  # all user observers are disabled for
  # just the duration of the block
end

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 37
def disable(*observers, &block)
  set_enablement(false, observers, &block)
end
disabled_for?(observer)

Returns true if the given observer is disabled for the model class.

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 14
def disabled_for?(observer)
  disabled_observers.include?(observer.class)
end
enable(*observers, &block)

Enables one or more observers. This supports multiple forms:

ORM.observers.enable :user_observer
  # => enables the UserObserver

User.observers.enable AuditTrail
  # => enables the AuditTrail observer for User notifications.
  #    Other models will not be affected (i.e. they will not
  #    trigger notifications to AuditTrail if previously disabled)

ORM.observers.enable :observer_1, :observer_2
  # => enables Observer1 and Observer2 for all models.

ORM.observers.enable :all
  # => enables all observers for all models.

User.observers.enable :all do
  # all user observers are enabled for
  # just the duration of the block
end

Note: all observers are enabled by default. This method is only useful when you have previously disabled one or more observers.

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 64
def enable(*observers, &block)
  set_enablement(true, observers, &block)
end
Instance Protected methods
disabled_observer_stack()

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 92
def disabled_observer_stack
  @disabled_observer_stack ||= []
end
disabled_observers()

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 70
def disabled_observers
  @disabled_observers ||= Set.new
end
each_subclass_array()

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 113
def each_subclass_array
  model_class.descendants.each do |subclass|
    yield subclass.observers
  end
end
end_transaction()

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 96
def end_transaction
  @disabled_observers = disabled_observer_stack.pop
  each_subclass_array do |array|
    array.end_transaction
  end
end
observer_class_for(observer)

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 74
def observer_class_for(observer)
  return observer if observer.is_a?(Class)

  if observer.respond_to?(:to_sym) # string/symbol
    observer.to_s.camelize.constantize
  else
    raise ArgumentError, "#{observer} was not a class or a " +
      "lowercase, underscored class name as expected."
  end
end
set_enablement(enabled, observers)

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 119
def set_enablement(enabled, observers)
  if block_given?
    transaction do
      set_enablement(enabled, observers)
      yield
    end
  else
    observers = ActiveModel::Observer.descendants if observers == [:all]
    observers.each do |obs|
      klass = observer_class_for(obs)

      unless klass < ActiveModel::Observer
        raise ArgumentError.new("#{obs} does not refer to a valid observer")
      end

      if enabled
        disabled_observers.delete(klass)
      else
        disabled_observers << klass
      end
    end

    each_subclass_array do |array|
      array.set_enablement(enabled, observers)
    end
  end
end
start_transaction()

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 85
def start_transaction
  disabled_observer_stack.push(disabled_observers.dup)
  each_subclass_array do |array|
    array.start_transaction
  end
end
transaction()

Source: show | on GitHub 

# File activemodel/lib/active_model/observer_array.rb, line 103
def transaction
  start_transaction

  begin
    yield
  ensure
    end_transaction
  end
end