My code is the below.

mails_preview.rb

summaries = ["testntestntestntest", "testntestntestntest"]
ClientsMailer.test(summaries)

clients_mailer.rb

class ClientsMailer < ApplicationMailer
  def test(summaries)
    @summaries = summaries

    mail(
      to: "[email protected],
      subject: "test",
    )
  end
end

test.slim

= @summaries.map { |summary| summary }.join("n")

Output is here

test test test test test test test test

n doesn’t work for making a new line.

I can’t understand why.

Do you have any ideas?