CODEWITHSUNDEEP
ruby-on-railsrubyactiverecordruby-on-rails-6
Thomas Van Holder
Thomas Van Holder

Reputation: 1507

How to store and use multiple cart_ids in a session

I'm hoping anyone can point me in the right direction as I've been breaking my head around this issue for a couple of days 😩.

A single website lists multiple shops, each with a show page, from which a user can select and add products to a (session) cart. Every shop has a corresponding cart. The user performs an individual checkout process for each cart. On the carts#index page, the user can see an overview of the active carts.

I've found the below snippet to be completely working. Yet, when trying to upgrade the set_cart method to include multiple carts, my own logic and ideas fail.

module CurrentCart
  private

  def set_cart
    @cart = Cart.find(session[:cart_id])
  rescue ActiveRecord::RecordNotFound
    @cart = Cart.create
    session[:cart_id] = @cart.id
  end
end

An approach that worked, but isn't very scalable, is to create 1 session cart for the entire website and then send a shop instance to filter down (i.e., @cart.items_for_shop(@shop). The issue is that both a cart instance and a shop instance need to be available everywhere in the app. It would make much more sense to have a separate cart_id for each shop.

How would you approach storing multiple carts in the session?

Many thanks in advance 🙏

Upvotes: 0

Views: 87

Answers (1)

Jon
Jon

Reputation: 10898

I would probably go down the route of having a ParentCart, or MetaCart, or whatever you want to call the thing that all the carts for each shop belong to. Lets go with UberCart for this example.

So, your set_cart method finds or creates an UberCart record, exactly as you currently have for a normal Cart.

Next, for each shop, either when you create the UberCart, or maybe later when you view a shop ... up to you, you create a Cart, which is essentially a join table between your UberCart and the chosen Shop.

LineItems from the Shop are then attached to the correct Cart, which is accessible from the UberCart in your session.

In your CartController#index action you can then just use @uber_cart.carts to access all the carts belonging to this UberCart.

Upvotes: 1

Related Questions