delete_all(dependent = nil)
Instance Public methods
Deletes all the records from the collection. For has_many
associations, the deletion is done according to the strategy specified by
the :dependent option. Returns an array with the deleted
records.
If no :dependent option is given, then it will follow the
default strategy. The default strategy is :nullify. This sets
the foreign keys to NULL. For, has_many
:through, the default strategy is delete_all.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | class Person < ActiveRecord::Base has_many :pets # dependent: :nullify option by defaultendperson.pets.size # => 3person.pets# => [# #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>,# #<Pet id: 2, name: "Spook", person_id: 1>,# #<Pet id: 3, name: "Choo-Choo", person_id: 1># ]person.pets.delete_all# => [# #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>,# #<Pet id: 2, name: "Spook", person_id: 1>,# #<Pet id: 3, name: "Choo-Choo", person_id: 1># ]person.pets.size # => 0person.pets # => []Pet.find(1, 2, 3)# => [# #<Pet id: 1, name: "Fancy-Fancy", person_id: nil>,# #<Pet id: 2, name: "Spook", person_id: nil>,# #<Pet id: 3, name: "Choo-Choo", person_id: nil># ] |
If it is set to :destroy all the objects from the collection
are removed by calling their destroy method. See
destroy for more information.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | class Person < ActiveRecord::Base has_many :pets, dependent: :destroyendperson.pets.size # => 3person.pets# => [# #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>,# #<Pet id: 2, name: "Spook", person_id: 1>,# #<Pet id: 3, name: "Choo-Choo", person_id: 1># ]person.pets.delete_all# => [# #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>,# #<Pet id: 2, name: "Spook", person_id: 1>,# #<Pet id: 3, name: "Choo-Choo", person_id: 1># ]Pet.find(1, 2, 3)# => ActiveRecord::RecordNotFound |
If it is set to :delete_all, all the objects are deleted
without calling their destroy method.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | class Person < ActiveRecord::Base has_many :pets, dependent: :delete_allendperson.pets.size # => 3person.pets# => [# #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>,# #<Pet id: 2, name: "Spook", person_id: 1>,# #<Pet id: 3, name: "Choo-Choo", person_id: 1># ]person.pets.delete_all# => [# #<Pet id: 1, name: "Fancy-Fancy", person_id: 1>,# #<Pet id: 2, name: "Spook", person_id: 1>,# #<Pet id: 3, name: "Choo-Choo", person_id: 1># ]Pet.find(1, 2, 3)# => ActiveRecord::RecordNotFound |
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