How do you delete an ActiveRecord object?

Question

How do you delete an ActiveRecord object?

I looked at Active Record Querying and it does not have anything on deleting that I can see.

1. Delete by

Answer 1

1. User.destroy

User.destroy(1) will delete user with id == 1 and :before_destroy and :after_destroy callbacks occur. For example if you have associated records

has_many :addresses, :dependent => :destroy

After user is destroyed his addresses will be destroyed too. If you use delete action instead, callbacks will not occur.

2. User.destroy, User.delete

3. User.destroy_all() or User.delete_all()

Notice: User is a class and user is an instance object