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?
This question is related to
ruby-on-rails
rails-activerecord
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.destroyUser.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.
User.destroy, User.delete
User.destroy_all(<conditions>) or User.delete_all(<conditions>)
Notice: User is a class and user is an instance object
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.
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
Source: Stackoverflow.com