Rails 在电子邮件中嵌入图像答案

【问题标题】：Rails embed image in emailRails 在电子邮件中嵌入图像
【发布时间】：2015-01-29 22:52:20
【问题描述】：

在 Rails 应用程序中，我正在尝试将图像（徽标）嵌入（内联）到电子邮件中。

这是 invoice.mailer.rb：

class InvoiceMailer < ActionMailer::Base
  def invoice_email(invoice)
    @invoice = invoice
    @recipients = @invoice.workorder.client.contacts.where(:receiveinvoices => true)
    tomail = @recipients.collect(&:email).join(",")
    frommail = @invoice.tenant.from_email
    copymail = @invoice.tenant.copy_email
    attachments.inline['AME_Logo.gif'] = File.read( Rails.root.join('app/assets/images/AME_Logo.gif') )

    mail(
        :to => tomail,
        :bcc => copymail,
        :from => frommail,
        :subject => "New Invoice from " + @invoice.tenant.name

    )
  end
end

这是 _invoice_email.html.erb：

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <style type="text/css" media="screen">
  </style>
</head>
<body style="margin-left: auto; margin-right: auto; width: 700px">
<div class="invoice">
<div class="inv_header" style="margin-left:10px; margin-right: auto; width: 650px">
  <h4>Invoice</h4>
  <%= image_tag attachments['AME_Logo.gif'].url -%>
</div>

我从 image_tag 代码行收到此错误：

undefined local variable or method `attachments' for #<#<Class:0x007f8a49ce7b08>:0x007f8a4e352110>

感谢您的帮助！

【问题讨论】：

标签： ruby-on-rails

【解决方案1】：

你为什么不在你的 image_tag 助手中硬编码路径？

<%= image_tag('http://path-to-your-site/assets/AME_Logo.gif') %>

如果必须是附件，则必须将其设为实例变量：

@attachments.inline['AME_Logo.gif'] = File.read( Rails.root.join('app/assets/images/AME_Logo.gif') )

在您的邮件中：

<%= image_tag @attachments['AME_Logo.gif'].url -%>

【讨论】：

我试过<%= image_tag("/images/AME_Logo.gif", :class => 'pull-right padding-right') %> - 图片是附件，但不是内联的。