如何通过表单输入将ActionMailer电子邮件发送到电子邮件？

Question

我希望登录用户能够将他们朋友的电子邮件输入到表单输入中，单击“发送”，然后它会向他们发送邮件。这是我到目前为止所拥有的

mailer.rb

class Mailer < ActionMailer::Base
 default from: "donotreply@site.net"

 def invite(recipient_email, body, subject)
  @recipient_email = recipient_email
  @body = body
  mail(to: recipient_email, 
   body: body
   subject: 'Join me on this awesome site!')
  end
end

mailer_controller

class mailerController < ApplicationController

def new
end

 def create
  @recipient_email = params[:recipient_email]
  body = params[:invitation]
  Mailer.invitation(@recipient_email).deliver 
  flash.now[:notice] = 'Message sent'
  redirect_to root_url
 end
end

new.html.erb

<%= simple_form_for(new_invitation_url) do |f| %>
<%= f.label :email %>
<%= f.input :recipient_email %>
<%= f.submit :invite %>
<% end %>

invite.html.erb

Mailer#invite
Check out this awesome site!

<%= new_user_url %>

的routes.rb

post "invites/new" => "invite#create", as: :new_invite