Question

我是Rails的新手，我一直在尝试使用Active Job和Action Cable以及Presenter和我在所有地方进行搜索，但却无法弄明白。

所以我的问题是，有没有办法在局部使用presenter并将其渲染到控制器之外（例如在ActiveJob中）？

以下是我想要实现的目标：

我有一个消息系统（更像是电子邮件），带有会话控制器和消息控制器。我想要实现的是当某人开始新的对话时，如果接收者在对话索引页面上，则新对话会自动附加到他们的索引视图。（如在电子邮件中）使用ActionCable

所以，我的对话.rb

    class Conversation < ApplicationRecord
    has_many :messages, dependent: :destroy
    after_create_commit { ConversationBroadcastJob.perform_later(self) }

conversation_broadcast_job.rb

    class ConversationBroadcastJob < ApplicationJob
     queue_as :default

       def perform(conversation)
        ActionCable.server.broadcast "conversations:#{conversation.receiver_id}",
                              {convo: render_conversation(conversation)}
      end

      private

      def render_conversation(conversation)
        ConversationsController.render(partial: 'conversations/conversation',
                     locals: {conversation: conversation, var: 'not'})
      end

    end

和我的_conversation.html.erb，我按照RailCast

的这一集使用了Presenter

    <% present conversation do |conversation_presenter| %>

    <div class="conversation <%=conversation_presenter.css(var)%>"
         id="conversation_<%= conversation.id %>"
         data-sender-id='<%= conversation_presenter.sender_id%>'>

      <%=conversation_presenter.avatar%>

      <div class="conversation-counterpart-name conversation-info truncate">
        <%=conversation_presenter.name(var) %>
      </div>


      <div class='conversation-subject conversation-info truncate'>
        <%=link_to conversation_messages_path(conversation),
                                      class:'link-gray truncate' do |n|%>
          <%=conversation_presenter.subject %>
           <div class='last-message truncate'>
            <%=conversation_presenter.last_message%>
          </div>
        <% end %>
      </div>

      <div class="conversation-date conversation-info">
        <%=conversation_presenter.last_date%>
      </div>

    </div>

    <% end %>

本方法在ApplicationHelper

中定义

      def present(object, klass = nil)
        klass ||= "#{object.class}Presenter".constantize
        presenter = klass.new(object, self)
        yield presenter if block_given?
        presenter
      end

conversation_presenter.rb

    class ConversationPresenter < BasePresenter

      presents :conversation
      delegate :subject, to: :conversation


      def name(var)
        if conversation.sender_id == var.id
          conversation.receiver.name
        else
          conversation.sender.name
        end
      end

      def last_date
        if conversation.last_msg.nil?
          conversation.render_date
        else
          conversation.last_msg.render_date
        end
      end

      def last_message
        conversation.last_msg.content unless conversation.last_msg.nil?
      end

      def avatar
        h.image_tag('avatar.svg', size: 30, class:'conversation-        counterpart-avatar')
      end

      def css(var)
        "unread" unless
        conversation.read || (!conversation.last_msg.nil? &&     conversation.last_msg.wrote_by(var))
      end

      def sender_id
        if conversation.last_msg.nil?
          conversation.sender_id
        else
          conversation.last_msg.author_id
        end
      end

    end

问题从这里开始，部分赢得不会在ActiveJob中呈现，因为我假设的会话主持人。所以我的问题是，无论如何使用演示者在控制器外部进行渲染？

如果您需要有关我代码其他部分的任何信息，请与我们联系

谢谢！

Answer 1

我使用以下代码足以从ActiveJob运行它：

Illuminate

摘自https://makandracards.com/makandra/17751-render-a-view-from-a-model-in-rails

Answer 2

尝试使用

ConversationsController.render - ＆gt;的 ApplicationController.renderer.render

这对我有所帮助。

def render_conversation(conversation) renderer=ApplicationController.renderer.new renderer.render(partial: 'conversations/conversation', locals: {conversation: conversation, var: 'not'}) end

Answer 3

以下在Rails 5中起作用：

ApplicationController.render(
  :template => 'users/index',
  :layout => 'my_layout',
  :assigns => { users: @users }
)

示例：这可以位于作业文件夹或您希望的任何其他位置。

我用于工作（jobs / invoice_job.rb）

invoice_obj = Invoice.first
# Process the pdf_attachement in any way you want
pdf_attachement = WickedPdf.new.pdf_from_string(
      ApplicationController.render(template: 'invoices/invoice_pdf.html.erb', layout: 'layouts/pdf.html.haml', assigns: { invoice: invoice })
    )

在如下视图中使用它：（views / invoices / invoice_pdf.html.erb）

<%
@invoice = assigns[:invoice]
%>
<%= render 'invoices/invoice_pdf_template' %> <!-- generate your pdf html -->

pdf布局：（layouts / pdf.html.haml）

!!!
%html
  %head
    %title RailsWickedPdf
    = wicked_pdf_stylesheet_link_tag "application", :media => "all"
    = wicked_pdf_stylesheet_link_tag "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css", media: "all"
    = wicked_pdf_javascript_include_tag "application"
    = csrf_meta_tags
  %body
    = yield

请参阅here，以获取更多信息。

Rails 5使用演示者使用活动作业渲染视图/部分

3 个答案: