小编hel*_*rld的帖子

我正在关注michael harlt rails教程,但是我收到了这个错误

缺少模板布局/邮件使用{:locale => [:en],:formats => [:html],:variants => [],:handlers => [:raw,:erb,:html,:builder,:红宝石,:咖啡,:jbuilder]}.搜索:*"/ home/ubuntu/workspace/app/views"

预览帐户激活时

这是我的user_mailer.rb

class UserMailer < ApplicationMailer

  def account_activation(user)
    @user = user
    mail to: user.email,  subject: "Account activation"
  end

  def password_reset
    @greeting = "Hi"

    mail to: "to@example.org"
  end
end

并且错误突出显示的行

mail to: user.email,  subject: "Account activation"

我尝试在user_mailer.rb中添加layout'mailer',但它不起作用.

编辑: 这是错误的屏幕截图

我文件夹的截图

我正在研究Michael Hartl的Ruby on Rails教程,并且我添加了代码来显示用户的Gravatar图像.但它没有显示.

这是我的用户帮助

module UsersHelper
  # Returns the Gravatar (http://gravatar.com/) for the given user.
  def gravatar_for(user)
    gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
    gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}"
    image_tag(gravatar_url, alt: user.name, class: "gravatar")
  end
end

这是我的show.html.erb

<% provide(:title, @user.name) %>
<div class="row">
  <aside class="col-md-4">
    <section class="user_info">
      <h1>
        <%= gravatar_for @user %>
        <%= @user.name %>
      </h1>
    </section>
  </aside>
</div>

这是我检查元素时的代码

    <img alt="humber" class="gravatar" src="https://secure.gravatar.com/avatar/8e92292186fbb306e253b08d0f3eb993">
    humber

这是图像

当我运行heroku run rake db:migrate in production时,我收到此错误.DEPRECATION WARNING:config.serve_static_files已弃用,将在Rails 5.1中删除.请config.public_file_server.enabled = true改用.(从/app/config/environments/production.rb:25中的块调用)

我在stackoverflow上尝试了一些解决方案,但我无法解决问题.

这是我的production.rb文件

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # Code is not reloaded between requests.
  config.cache_classes = true

  # Eager load code on boot. This eager loads most of Rails and
  # your application in memory, allowing both threaded web servers
  # and those relying on copy on write to perform better.
  # Rake tasks automatically ignore this option …