Ruby on rails 如何向订户发送特定电子邮件

所以，我有3个模型：报价、分类和订户

本质上，它是一个时事通讯应用程序。订阅者可以选择一个类别，然后输入他们的电子邮件地址，他们将通过电子邮件收到与该类别相关的报价

这里有两个问题

1. Categories aren't syncing to subscribers because the foreign_key isn't being set. 
For example when I run category.subscribers.last 
it's nil. and category.subscribers throws an empty array. How can I sync these? I think it has
to do with the fact that subscribers are selecting a category from the Category::CATEGORY_TYPES
constant as seen in the view code below. The fact that it's a model constant that's being selected
is why the foreign key isn't being set between subscriber and category, how do I set it?

2. I'd like to automate it so that these emails are sent to subscribers once a day. 
They should also be in randomized order.
How might I do this? 

查看代码订阅服务器/new.html.erb：

<div class="styled email-input2">
    <%= form_for @subscriber do |f| %>
    <% if @subscriber.errors.any? %>
      <div class="errorExplanation" style="color: white;">
      <h2><%= pluralize(@subscriber.errors.count, 'error') %> encountered:</h2>
      <ul>
      <% @subscriber.errors.full_messages.each do |m| %>
      <li><%= m %></li>
     <% end %>
     </ul>
     </div>
  <% end %>
  <%= f.fields_for :subscriber, @subscriber.build_category do |cat| %>
  <%= cat.select(:category_type, Category::CATEGORY_TYPE.map{|p| [p[1], p[0]]}, {prompt: 'Please select'}, {class: 'styled email-input2'}) %>
  <% end %>
</div>

模型：

category.rb

在Rails c中，我运行：

Category.all.each do |category|
    Mailer.SendMyEmail(category, category.quotes.first, category.subscribers).deliver
end

在I mailer中的sendmail函数中

def SendMyEmail(category, quote, subscribers)
    #MY CODE FOR TYHE VIEW HERE
end

更新图像示例

---

因此，没有比官方文件更好的地方可以开始：

如果您正在寻找应该调用方法来发送电子邮件的位置，那么您可能希望在控制器中，在接收表单POST的方法中执行此操作。请看以下指南中的示例：

class UsersController < ApplicationController
  # POST /users
  # POST /users.json
  def create
    @user = User.new(params[:user])

    respond_to do |format|
      if @user.save
        # Tell the UserMailer to send a welcome email after save
        UserMailer.welcome_email(@user).deliver

        format.html { redirect_to(@user, notice: 'User was successfully created.') }
        format.json { render json: @user, status: :created, location: @user }
      else
        format.html { render action: 'new' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end
end

---

另外，如果您正在查看Rails 4.2，您有一个应用程序示例，使用。

您必须使用ActionMailer-Reference：您能告诉我Quote和Category类中的模型字段吗？它们在原始文章Quote.rb和Category.rb中。@sonnyback您需要保存用户和类别之间的关联，然后，每当您有此类别中的新项目时，向用户发送一封电子邮件。用我的两个问题更新原始帖子。@SonnyBlack如果您有更多问题，我认为您应该打开另一个问题。

category = Category.find(1)
category.quotes

Category.all.each do |category|
    Mailer.SendMyEmail(category, category.quotes.first, category.subscribers).deliver
end

def SendMyEmail(category, quote, subscribers)
    #MY CODE FOR TYHE VIEW HERE
end

class UsersController < ApplicationController
  # POST /users
  # POST /users.json
  def create
    @user = User.new(params[:user])

    respond_to do |format|
      if @user.save
        # Tell the UserMailer to send a welcome email after save
        UserMailer.welcome_email(@user).deliver

        format.html { redirect_to(@user, notice: 'User was successfully created.') }
        format.json { render json: @user, status: :created, location: @user }
      else
        format.html { render action: 'new' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end
end