how to update a field on after_save rails

To update a field after saving a record in Ruby on Rails, you can use the after_save callback. Here are the steps to achieve this:

Declare the after_save callback in your model: In the model file (e.g., app/models/your_model.rb), add the following code:

after_save :update_field

def update_field
  # Code to update the field goes here
end

Define the update_field method: Inside the model, define the update_field method. This method will contain the code to update the desired field. For example, if you want to update the name attribute of the record, you can use the following code:

def update_field
  self.name = "New Name"
  self.save
end

Customize the code to update the field: Modify the update_field method according to your specific requirements. You can update multiple fields, perform calculations, or use any other logic to update the field as needed.
Save the record: After making the necessary updates to the field, call the save method to save the changes to the record. This will update the field in the database.

Note: Remember to replace your_model with the actual name of your model, and name with the name of the field you want to update.

That's it! The update_field method will be executed automatically after the record is saved, allowing you to update the desired field.