Question

I have a user model that has many carts

class User < ActiveRecord::Base
  has_many :carts

If I update a cart:

User.last.carts.last.time_purchased = Time.now

Is there a way I can save the whole user model? Now, if I call

User.last.save

The cart that I modified is not saved.

User.last.carts.last.save

Does save the cart.

Is there a way to save all updated attributes of a model?

Thanks

Answer 1

Saving a model will save any of its associations, but the reason this isn’t working for you is because you are re-fetching the User model instead of modifying and saving the same instance.

user = User.last
user.carts.last.time_purchased = Time.now
user.save

Saving the user should also save the associated cart.