How to save a model without running callbacks in Rails

Question

I need to calculate values when saving a model in Rails. So I call calculate_averages as a callback for a Survey class:

before_save         


        

Answer 1

I believe what you are asking for can be achieved with ActiveSupport::Callbacks. Have a look at set_callback and skip_callback.

In order to "force callbacks to get called even if you made no changes to the record", you need to register the callback to some event e.g. save, validate etc..

set_callback :save, :before, :my_before_save_callback

To skip the before_save callback, you would do:

Survey.skip_callback(:save, :before, :calculate_average). 

Please reference the linked ActiveSupport::Callbacks on other supported options such as conditions and blocks to set_callback and skip_callback.

Answer 2

Doesn't work for Rails 5

Survey.skip_callback(:save, :before, :calculate_average) 

Works for Rails 5

Survey.skip_callback(:save, :before, :calculate_average, raise: false)

https://github.com/thoughtbot/factory_bot/issues/931

Answer 3

Rails 5.2.3 requiring an after party script to NOT trigger model events, update_column(column_name, value) did the trick:

task.update_column(task_status, ReferenceDatum::KEY_COMPLETED)

https://apidock.com/rails/ActiveRecord/Persistence/update_column

Answer 4

update_column is an ActiveRecord function which does not run any callbacks, and it also does not run validation.

Answer 5

hopefully this is what you're looking for.

https://stackoverflow.com/a/6587546/2238259

For your second issue, I suspect it would be better to inspect when this calculation needs to happen, it would be best if it could be handled in batch at a specified time where network traffic is at its trough.

EDIT: Woops. I actually found 2 links but lost the first one, apparently. Hopefully you have it fixed.

Answer 6

For Rails 3 ActiveSupport::Callbacks gives you the necessary control. You can reset_callbacks en-masse, or use skip_callback to disable judiciously like this:

Vote.skip_callback(:save, :after, :add_points_to_user)

…after which you can operate on Vote instances with :add_points_to_user inhibited