How do I set a blank value for an f.select form field

Question

I am using the following to allow my users to select their sex in their profile.

<%= f.select (:sex, %w{ Male Female }) %>

How would I c

Answer 1

I tried to use 'prompt' as a string. But in the rendered output, the new option prompt was not appearing. The select_tag method searches only for a symbol. It appears to be the case for :include_blank as well. Check out the options.delete:

  def select_tag(name, option_tags = nil, options = {})
    option_tags ||= ""
    html_name = (options[:multiple] == true && !name.to_s.ends_with?("[]")) ? "#{name}[]" : name

    if options.include?(:include_blank)
      include_blank = options.delete(:include_blank)

      if include_blank == true
        include_blank = ''
      end

      if include_blank
        option_tags = content_tag(:option, include_blank, value: '').safe_concat(option_tags)
      end
    end

    if prompt = options.delete(:prompt)
      option_tags = content_tag(:option, prompt, value: '').safe_concat(option_tags)
    end

    content_tag :select, option_tags, { "name" => html_name, "id" => sanitize_to_id(name) }.update(options.stringify_keys)
  end

Also note that :include_blank and :prompt will be options of the select or select_tag, not the options_for_select.