Rails nested attributes - how to add category attribute to new product?

I see that product has_many categories. It's naturally to allow the user to specify them at product creation/edition. One approach is described here (via checkboxes to assign categories to your product).

Another way: create product as usually and allow adding/removing categories on its edit page, like.

First of all to show categories in view file use something like following to show category in dropdown.

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