电子邮件属性的未定义方法答案

【问题标题】：Undefined Method For Email Attribute电子邮件属性的未定义方法
【发布时间】：2020-01-27 12:39:04
【问题描述】：

我正在尝试一次向多个收件人发送一堆单独的电子邮件。我打算这样做是用户将下载一个 Excel 电子表格并用一堆姓名和相应的电子邮件填写它，然后将该电子表格上传到应用程序。该应用程序创建填写了字段的客人名单对象，我想向客人名单中的每个人发送一封电子邮件。

客人名单的导入工作正常，但我似乎无法让我的邮件程序正常发送电子邮件。

更新

Mailer 现在发送的电子邮件数量与来宾列表中的人数相同，但所有电子邮件都发送到其中一个电子邮件地址。

邮件代码：

def guestlist_email()
 Guestlist.all.each { |guestlist| mail(to: guestlist.email) }
end

控制器代码：

def import
 Guestlist.import(params[:file])
 Guestlist.all.each do |guestlist|
  GuestMailer.with(guestlist: @guestlist).guestlist_email.deliver_now
 end
 redirect_to guestlists_url, notice: "Guest-list Successfully 
 Imported."
end

如果您需要更多代码，我会上传。

这是来自终端的日志。

  (0.2ms)  begin transaction
  ↳ app/models/guestlist.rb:20
  Guestlist Create (3.5ms)  INSERT INTO "guestlists" ("id", "name", "email", "response", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["id", 3], ["name", "Ryan Neill"], ["email", "ryan.neill11@gmail.com"], ["response", "no"], ["created_at", "2019-10-01 14:43:31.133312"], ["updated_at", "2019-10-01 14:43:31.133312"]]
  ↳ app/models/guestlist.rb:20
   (3.1ms)  commit transaction
  ↳ app/models/guestlist.rb:20
  Guestlist Load (0.3ms)  SELECT  "guestlists".* FROM "guestlists" WHERE "guestlists"."id" = ? LIMIT ?  [["id", 2], ["LIMIT", 1]]
  ↳ app/models/guestlist.rb:18
   (0.1ms)  begin transaction
  ↳ app/models/guestlist.rb:20
  Guestlist Create (1.1ms)  INSERT INTO "guestlists" ("id", "name", "email", "response", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["id", 2], ["name", "robiin"], ["email", "robinbrink43@gmail.com"], ["response", "yes"], ["created_at", "2019-10-01 14:43:31.147201"], ["updated_at", "2019-10-01 14:43:31.147201"]]
  ↳ app/models/guestlist.rb:20
   (3.6ms)  commit transaction
  ↳ app/models/guestlist.rb:20
  Guestlist Load (0.3ms)  SELECT  "guestlists".* FROM "guestlists" WHERE "guestlists"."id" = ? LIMIT ?  [["id", 1], ["LIMIT", 1]]
  ↳ app/models/guestlist.rb:18
   (0.1ms)  begin transaction
  ↳ app/models/guestlist.rb:20
  Guestlist Create (0.8ms)  INSERT INTO "guestlists" ("id", "name", "email", "response", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["id", 1], ["name", "ryan"], ["email", "ryan.neill11@gmail.com"], ["response", ""], ["created_at", "2019-10-01 14:43:31.159332"], ["updated_at", "2019-10-01 14:43:31.159332"]]
  ↳ app/models/guestlist.rb:20
   (3.8ms)  commit transaction
  ↳ app/models/guestlist.rb:20
Redirected to http://localhost:3000/guestlists
  Guestlist Load (0.6ms)  SELECT  "guestlists".* FROM "guestlists" ORDER BY "guestlists"."id" ASC LIMIT ?  [["LIMIT", 1]]
  ↳ app/mailers/guest_mailer.rb:11
  Rendering guest_mailer/guestlist_email.html.erb within layouts/mailer
  Rendered guest_mailer/guestlist_email.html.erb within layouts/mailer (1.0ms)
  Guestlist Load (0.5ms)  SELECT  "guestlists".* FROM "guestlists" ORDER BY "guestlists"."id" ASC LIMIT ? OFFSET ?  [["LIMIT", 1], ["OFFSET", 1]]
  ↳ app/mailers/guest_mailer.rb:12
  Rendering guest_mailer/guestlist_email.html.erb within layouts/mailer
  Rendered guest_mailer/guestlist_email.html.erb within layouts/mailer (1.1ms)
  Guestlist Load (0.8ms)  SELECT  "guestlists".* FROM "guestlists" ORDER BY "guestlists"."id" ASC LIMIT ? OFFSET ?  [["LIMIT", 1], ["OFFSET", 2]]
  ↳ app/mailers/guest_mailer.rb:13
  Rendering guest_mailer/guestlist_email.html.erb within layouts/mailer
  Rendered guest_mailer/guestlist_email.html.erb within layouts/mailer (0.1ms)
GuestMailer#guestlist_email: processed outbound mail in 108.8ms
Sent mail to ryan.neill11@gmail.com (3768.3ms)
Date: Tue, 01 Oct 2019 16:43:31 +0200
From: rsvpeasy01@gmail.com
To: ryan.neill11@gmail.com
Message-ID: <5d9366134463d_7c6d3fdbf4e367045421e@Ryans-MacBook-Air.local.mail>
Subject: Guestlist email
Mime-Version: 1.0
Content-Type: text/html;
 charset=UTF-8
Content-Transfer-Encoding: 7bit

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style>
      /* Email styles need to be inline */
    </style>
  </head>

  <body>
    <!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style>
      /* Email styles need to be inline */
    </style>
  </head>

  <body>
  </body>
</html>

  </body>
</html>

Completed 302 Found in 3969ms (ActiveRecord: 20.3ms)

提前致谢

【问题讨论】：

当你的导入方法执行时会发生什么？请发布您的日志输出 - 系统是否尝试发送电子邮件并失败？
我认为您的 guestlist_email 方法的第三行已损坏 - 您已经有一个名为 guestlist 的变量，因此不需要使用 @guestlist - 尝试摆脱 @guestlist = params[:guestlist] 并将下一行更改为mail(to: guestlist.email)
@Mark undefined method '`email' for nil:NilClass' 是我在'mail(to: @guestlist.email)' 行得到的错误 - 这就是我输入'@ guestlist = params[:guestlist]' 但没有它仍然无法工作
您在我的第二条评论中尝试过我的建议了吗？您将 @guestlist 分配给您的参数（在您的邮件中将为 nil）
会写出正确答案

标签： ruby email ruby-on-rails-5 actionmailer

【解决方案1】：

尝试以下方法：

def guestlist_email()
 Guestlist.all.each { |guestlist| mail(to: guestlist.email) }
end

如果上面的代码只是向第一个客人列表发送一封电子邮件，则强烈表明其他电子邮件是错误的。下面的代码与上面的代码相同，但会明确执行每封电子邮件：

def guestlist_email()
  mail(to: Guestlist.first.email )
  mail(to: Guestlist.second.email )
  mail(to: Guestlist.third.email )
end

如果其中一个有效而其他无效，则问题出在为您的第二个和第三个来宾列表存储的来宾列表电子邮件

第二次编辑：

尝试将您的导入方法更改为：

def import
  Guestlist.import(params[:file])
    Guestlist.all.each do |guestlist|
      GuestMailer.with(guestlist: @guestlist, event: @event).guestlist_email.deliver_now
    end
  redirect_to guestlists_url, notice: "Guestlists imported."
end

【讨论】：

这修复了错误，但只向列表中的第一个人发送一封电子邮件
你认为这可能是我在控制器中调用邮件程序的方式吗？
您确定要保存所有客人名单吗？上面的代码应该遍历每个 Guestlist - Guestlist.count 返回什么？
嗨@Mark，很抱歉延迟回复，但我做了'Guestlist.count'，它返回3，这是正确的数字。
如果您有 3 条访客列表记录，那么上面的代码应该将它们发送给我所看到的所有人

【解决方案2】：

如果您将电子表格导入功能与电子邮件功能分开，它可能更具可读性。所以首先导入整个excel表。然后循环遍历表中的数据，一次发送一封邮件。

你的循环应该是这样的：

class SendWeeklySummary
  def run
    User.find_each do |user|
      UserMailer.with(user: user).weekly_summary.deliver_now
    end
  end
end

来自

https://guides.rubyonrails.org/action_mailer_basics.html

【讨论】：