What's the difference between :include_blank and :prompt in the Rails select helper?

问题

In the Rails docs, the first two listed options for the select helper are :include_blank and :prompt. I've just realized that I'm using both in my code, but they seem to be interchangeable. Can anyone explain the difference? It's not clear to me from reading the docs.

回答1:

Main difference is:

include_blank: true

will render a blank option but

prompt: true

will execute

I18n.translate('helpers.select.prompt', :default => 'Please select')

来源：https://stackoverflow.com/questions/11302728/whats-the-difference-between-include-blank-and-prompt-in-the-rails-select-hel