Cannot remove item from cart. Spec is failing

I have a simple shopping cart app and I am trying to test the following method:

  def add(item_id)
    item = Product.find(item_id)
    args = {
      :product_id=>item.id,
      :seller_id=>item.shop_id,
      :price =>item.price
    }
    cart_items<<CartItem.create(args)
  end

  def remove(item_id)
    cart_items.where(:product_id=>item_id).map(&:destroy)
  end

The spec for this thing is

  it "should remove a product from the cart" do
    cart = Cart.new
    item = Product.create(:price=>3450,:id=>1,:shop_id=>1)
    cart.add(item.id)    
    cart.s开发者_StackOverflow社区hould_not be_empty

    cart.remove(item.id)
    cart.should be_empty
  end

No matter what I do, I cannot get it to pass. The cart_item.length is always equal to 1. Not sure why this is happening. Please help.

I suspect the problem is that you aren't saving the Cart to the database at any point.

I've often found that this is because you aren't reloading from the database after removing the item.

cart.reload
cart.should be_empty