I have a collection of related items that I need to be able to add to the cart at the same time, for example:

Amazing Living Room Table
Qty [ 1 ]

Amazing Chairs that match that table
Qty [ 3 ]

I am using the following code:

<input name="id[]" type="hidden" value="6625874" />
<input name="quantity[]" type="hidden" id="product-quantity-6625874" value="1" />
<input name="id[]" type="hidden" value="1857499" />
<input name="quantity[]" type="hidden" id="product-quantity-1857499" value="3" />

but I get the following error:

undefined method `to_i’ for [“1”, “3”]:Array
Error message:
undefined method `to_i’ for [“1”, “3”]:Array

The developers get an email about this automatically but if there is anything we can do for you please send us an email, referencing error
1d31-82-7e-3b-17a4e0

Can anybody help? I am able to add one of each item to the cart at once, simply by removing the quantity input fields.