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Rails delete_all 与 destroy_all的区别

原文 http://blog.csdn.net/axu_air/article/details/78403720

2017-11-01 02:02:19阅读(228)

delete(*records)

Deletes the records supplied from the collection according to the strategy specified by the :dependent option. If no :dependent option is given, then it will follow the default strategy. Returns an array with the deleted records.

For has_many :through associations, the default deletion strategy is :delete_all.

For has_many associations, the default deletion strategy is :nullify. This sets the foreign keys to NULL.
class Person < ActiveRecord::Base
  has_many :pets # dependent: :nullify option by default
end
person.pets.size # => 3
person.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(Pet.find(1))
# => [#<Pet id: 1, name: "Fancy-Fancy", person_id: 1>]
person.pets.size # => 2
person.pets
# => [
#       #<Pet id: 2, name: "Spook", person_id: 1>,
#       #<Pet id: 3, name: "Choo-Choo", person_id: 1>
#    ]
Pet.find(1)
# => #<Pet id: 1, name: "Fancy-Fancy", person_id: nil>
delete_all(dependent = nil)

Deletes all the records from the collection according to the strategy specified by the :dependent option. If no :dependent option is given, then it will follow the default strategy.

For has_many :through associations, the default deletion strategy is :delete_all.

For has_many associations, the default deletion strategy is :nullify. This sets the foreign keys to NULL.

class Person < ActiveRecord::Base
  has_many :pets # dependent: :nullify option by default
end
person.pets.size # => 3
person.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 # => 0
person.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>
#    ]
Both has_many and has_many :through dependencies default to the :delete_all strategy if the :dependent option is set to :destroy. Records are not instantiated and callbacks will not be fired.
class Person < ActiveRecord::Base
  has_many :pets, dependent: :destroy
end
person.pets.size # => 3
person.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.find(1, 2, 3)
# => ActiveRecord::RecordNotFound: Couldn't find all Pets with 'id': (1, 2, 3)
If it is set to :delete_all, all the objects are deleted without calling their destroy method.
class Person < ActiveRecord::Base
  has_many :pets, dependent: :delete_all
end
person.pets.size # => 3
person.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.find(1, 2, 3)
# => ActiveRecord::RecordNotFound: Couldn't find all Pets with 'id': (1, 2, 3)
destroy(*records)

Destroys the records supplied and removes them from the collection. This method will always remove record from the database ignoring the :dependent option. Returns an array with the removed records.

class Person < ActiveRecord::Base
  has_many :pets
end
person.pets.size # => 3
person.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.destroy(Pet.find(1))
# => [#<Pet id: 1, name: "Fancy-Fancy", person_id: 1>]
person.pets.size # => 2
person.pets
# => [
#       #<Pet id: 2, name: "Spook", person_id: 1>,
#       #<Pet id: 3, name: "Choo-Choo", person_id: 1>
#    ]
person.pets.destroy(Pet.find(2), Pet.find(3))
# => [
#       #<Pet id: 2, name: "Spook", person_id: 1>,
#       #<Pet id: 3, name: "Choo-Choo", person_id: 1>
#    ]
person.pets.size  # => 0
person.pets       # => []
Pet.find(1, 2, 3) # => ActiveRecord::RecordNotFound: Couldn't find all Pets with 'id': (1, 2, 3)
You can pass Integer or String values, it finds the records responding to the id and then deletes them from the database.
person.pets.size # => 3
person.pets
# => [
#       #<Pet id: 4, name: "Benny", person_id: 1>,
#       #<Pet id: 5, name: "Brain", person_id: 1>,
#       #<Pet id: 6, name: "Boss",  person_id: 1>
#    ]
person.pets.destroy("4")
# => #<Pet id: 4, name: "Benny", person_id: 1>
person.pets.size # => 2
person.pets
# => [
#       #<Pet id: 5, name: "Brain", person_id: 1>,
#       #<Pet id: 6, name: "Boss",  person_id: 1>
#    ]
person.pets.destroy(5, 6)
# => [
#       #<Pet id: 5, name: "Brain", person_id: 1>,
#       #<Pet id: 6, name: "Boss",  person_id: 1>
#    ]
person.pets.size  # => 0
person.pets       # => []
Pet.find(4, 5, 6) # => ActiveRecord::RecordNotFound: Couldn't find all Pets with 'id': (4, 5, 6)
Source: show | on GitHub
destroy_all()
Link
Deletes the records of the collection directly from the database ignoring the :dependent option. Records are instantiated and it invokes before_remove, after_remove , before_destroy and after_destroy callbacks.
class Person < ActiveRecord::Base
  has_many :pets
end
person.pets.size # => 3
person.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.destroy_all
person.pets.size # => 0
person.pets      # => []
Pet.find(1) # => Couldn't find Pet with id=1

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