accepts_nested_attributes_for with key "_destroy"

Question

The situation:

class Cellar < ActiveRecord::Base
  belongs_to :house, dependent: :destroy

  accepts_nested_attributes_for :house, allow_destroy: true

  attr_accessible :house_id, :house_attributes, [...]
end

.

class House < ActiveRecord::Base
  has_one: cellar
end

The problem:

When I send the Cellar form and include the key-value pair "_destroy" => "true" inside the house_attributes, the House gets destroyed as it should, but the Cellar.house_id is not updated to NULL.

Is this normal behavior? How should I best fix this?

Answer 1

For the sake of completeness, here's what I ended up doing in order to correct the issue:

class Cellar < ActiveRecord::Base
  belongs_to :house, dependent: :destroy

  accepts_nested_attributes_for :house, allow_destroy: true

  attr_accessible :house_id, :house_attributes, [...]

  # I ADDED THIS:
  before_save :drop_invalid_id
  def drop_invalid_id
    self.house_id = nil if house.marked_for_destruction?
  end
end