I am trying to get a collection of distinct manufacturers who sell a certain product type ("backpacks"). The problem is I can either get all the manufacturers, or I can get all the products that are backpacks, but I'm having an ungodly difficult time understanding how to join these collections to get a collection of manufacturers who sell backpacks.
I've gone through many experiments and not one has worked.
A common solution I've read on many pages was the use of:
I need help to understand either how to get only those manufacturers that sell backpack products via the attribute_option collection, or how to get distinct manufacturers from the collection of backpack products.