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    Delete by id  Delete the current object like  user remove  Can you delete based on a where clause

User · Answer

If you are using Rails 5 and above  the following solution will work   delete based on id user id   50 User find id  user id  delete all   delete based on condition threshold age   20 User where age  threshold age  delete all  https   www rubydoc info docs rails ActiveRecord 2FNullRelation delete all

User · Answer

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   gt   destroy   After user is destroyed his addresses will be destroyed too  If you use delete action instead  callbacks will not occur    User destroy  User delete User destroy all  lt conditions gt   or User delete all  lt conditions gt     Notice  User is a class and user is an instance object

User · Answer

It s destroy and destroy all methods  like  user destroy User find 15  destroy User destroy 15  User where age  20  destroy all User destroy all age  20    Alternatively you can use delete and delete all which won t enforce  before destroy and  after destroy callbacks or any dependent association options      User delete all condition   value   will allow you to delete records   without a primary key   Note  from  hammady s comment  user destroy won t work if User model has no primary key   Note 2  From  pavel-chuchuva s comment  destroy all with conditions and delete all with conditions has been deprecated in Rails 5 1 - see guides rubyonrails org 5 1 release notes html

User · Answer

There is delete  delete all  destroy  and destroy all  The docs are  older docs and Rails 3 0 0 docs delete doesn t instantiate the objects  while destroy does   In general  delete is faster than destroy

[ruby-on-rails] How do you delete an ActiveRecord object?

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