RoR - Select tag with include_blank disable

Answer 1

I believe they add the functionality in Rails 6.

From the pull request:

Enable select tag helper to mark prompt option as selected and/or disabled for required field. Example:

select :post, 
       :category, 
       ["lifestyle", "programming", "spiritual"], 
       { selected: "", disabled: "", prompt: "Choose one" }, 
       { required: true }

Placeholder option would be selected and disabled. The HTML produced: