Rails: Update model attribute without invoking callbacks

Question

I have a User model that has a :credits attribute. I want a simple button that will add 5 to the user\'s credits, through a route called \"add\" so that /users/3/add would ad

Answer 1

To update multiple attributes without callbacks you can use update_all in your model as so:

self.class.update_all({name: value, name: value}, self.class.primary_key => id)

If you really want you can even try even a update_columns method and mixin this to your active record base class.

To update one attribute you can use update_column. In addition there is some specific methods that can found in the rails guides http://guides.rubyonrails.org/active_record_callbacks.html#skipping-callbacks

Answer 2

You have a number of options, including changing which callback you use, e.g., after_create.

You can update columns without triggering callbacks, see Skipping Callbacks in the AR guide. For example, update_column doesn't trigger callbacks. The previous link lists non-triggering functions.

You could also use any of the Conditional Callback forms (or even an observer) for when the password is changed. See ActiveModel::Dirty, e.g., @user.password_changed?.

Answer 3

You should be able to use update_all to avoid triggering callbacks.

def add
 @user = User.find(params[:id])
 User.where(:id=>@user.id).update_all(:credits => @user.credits+5)
 redirect_to root_path
end

I'd prefer to put this logic in the model, but this should work to solve your original problem as spec'd in the controller.

Answer 4

A few options for how to do this in rails4 http://edgeguides.rubyonrails.org/active_record_callbacks.html#skipping-callbacks

Answer 5

You can update a column doing this

User.where( name: 'lily' ).update_all(age: '10')

Answer 6

As a general answer, in Rails 4 this is a simple way to update attributes without triggering callbacks:

@user.update_column :credits, 5

If you need to update multiple attributes without triggering callbacks:

@user.update_columns credits: 5, bankrupt: false  

There are other options here in the Rails Guides if you prefer, but I found this way to be the easiest.