Ruby on Rails中的Mailer控制器，活动记录查询
[英]Controller for Mailer in Ruby on Rails, Active Record query
问题描述
I followed a guide for setting up a mailer for ruby on rails (site of the guide: https://launchschool.com/blog/handling-emails-in-rails ). 
我遵循了为在Rails上设置红宝石邮件的指南（该指南的站点： https : //launchschool.com/blog/handling-emails-in-rails ）。
My preview looks like this: sample_email.html.erb 我的预览看起来像这样：sample_email.html.erb
<!DOCTYPE html>
<html>
<head>
<meta content='text/html; charset=UTF-8' http-equiv='Content-Type' />
</head>
<body>
<h1>Hi <%= @user.username %></h1>
<p>
Sie haben folgende Tags ausgewählt:
<% @user.tag_list.each do |tag| %>
<%= tag %> <br>
<% end %>
<br><br>
<% @infosall.each do |info| %> #<-- Problem on this line
<%= info.name %><br>
<% end %><br>
</p>
</body>
</html>
@user.username and @user.tag_list get rendered, but @infosall does not render. @ user.username和@ user.tag_list被渲染，但是@infosall不渲染。 Where do I need to type in @infosall, so it gets rendered on the preview? 我需要在哪里键入@infosall，以便它在预览中呈现？
example_mailer_preview.rb: example_mailer_preview.rb：
# Preview all emails at http://localhost:3000/rails/mailers/example_mailer
class ExampleMailerPreview < ActionMailer::Preview
def sample_mail_preview
ExampleMailer.sample_email(User.last)
end
end
example_mailer.rb: example_mailer.rb：
class ExampleMailer < ApplicationMailer
default from: ""
def sample_email(user)
@user = user
mail(to: @user.email, subject: 'Sample Email')
end
end
users_controller.rb: users_controller.rb：
class UsersController < ApplicationController
def show
@user = User.find_by_username(params[:username])
@tags = @user.tag_list
@infosall = Array.new
@tags.each do |tag|
@infosall = @infosall + Info.tagged_with(tag)
end
@infosall.uniq!
@infosall.sort! { |a,b| b.created_at <=> a.created_at }
end
end
Edit: When I do this in example_mailer_preview.rb: 编辑：当我在example_mailer_preview.rb中这样做时：
# Preview all emails at http://localhost:3000/rails/mailers/example_mailer
class ExampleMailerPreview < ActionMailer::Preview
def sample_mail_preview
ExampleMailer.sample_email(User.last)
@user = User.last
@tags = @user.tag_list
@infosall = Array.new
@tags.each do |tag|
@infosall = @infosall + Info.tagged_with(tag)
end
@infosall.uniq!
@infosall.sort! { |a,b| b.created_at <=> a.created_at }
end
end
I get a no method error: undefined method `find_first_mime_type' for # with this code: 我收到一个没有方法的错误：使用此代码的＃的未定义方法`find_first_mime_type'：
def find_preferred_part(*formats)
formats.each do |format|
if part = @email.find_first_mime_type(format)
return part
end
end
Where did I go wrong? 我哪里做错了？ Any advices? 有什么建议吗？
2 个解决方案
解决方案1
1 2016-02-13 21:35:44
@infosall should be an instance variable of ExampleMailer that gets passed along to the template, but you are not setting this variable in the mailer. @infosall应该是ExampleMailer的实例变量，该实例变量将传递给模板，但是您未在邮件程序中设置此变量。 You would need to set it in your sample_email method on your ExampleMailer in order for it to have any value or meaning in your template. 您需要在ExampleMailer的sample_email方法中进行设置，以使其在模板中具有任何值或含义。
解决方案2
1 已采纳 2016-02-13 21:36:35
Mailer is not related to controller. 邮件程序与控制器无关。 Also defining a show action for some model does not get it called when you render something with that model. 同样，为某个模型定义show action时，使用该模型渲染某些东西时不会调用它。
Think of mailer as of a controller, set all needed instance variable in its actions ( sample_email in this case) 将邮件程序视为控制器，在其操作中设置所有需要的实例变量（在这种情况下为sample_email ）
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