Question

我收到此错误

AbstractController::DoubleRenderError: Render and/or redirect were called 
multiple times in this action. Please note that you may only call render 
OR redirect, and at most once per action. Also note that neither redirect 
nor render terminate execution of the action, so if you want to exit an 
action after redirecting, you need to do something like "redirect_to(...) 
and return"

您可以在下面找到控制器，型号和视图

这是模型（app / models / upload_file.rb）

class UploadFile

  def self.save(uploadData)
    @success = true;

    begin
      name = uploadData.original_filename
      directory = 'public/data'
      # create the file on the server
      path = File.join(directory, name)
      # write the file
      File.open(path, "wb") { |f| f.write(uploadData.read) }

    rescue
      @success = false;
    end

    return @success;
  end

  def cleanup
    #Borrar el archivo una vez se haya procesado (ojo con los que se analizan pero tienen errores, tambien se deben borrar)
  end
end

这是控制器的相关部分（app / controllers / employees_controller.rb）

  def upload
    add_breadcrumb 'Cargar Archivo', :employees_upload_path
    render 'employees/uploadFile'
  end

  def uploadFile
    @exito = UploadFile.save(params['upload']['datafile'])

    if (@exito)
      redirect_to employees_uploadValidate_path and return
    end
  end

这是视图（app / views / employees / uploadFile.html.erb）

<script type="text/javascript">
    function validateFileName() {
        var fileName ;
        var valido ;

        fileName = document.getElementById("upload_datafile").value ;

        //Revisar que el archivo tenga la extension esperada
        valido = (fileName !== undefined) && (fileName.length >= 5) && (endsWith(fileName.toUpperCase(),".XLS") || endsWith(fileName.toUpperCase(),".XLSX")) ;

        if (!valido) {
            alert('Debe elegir un archivo de EXCEL (XLS o XLSX)')
        }

        return valido ;
    }

    function endsWith(str, suffix) {
        return str.indexOf(suffix, str.length - suffix.length) !== -1;
    }
</script>
<div class="left p-breadcrumbs">
  <%= render_breadcrumbs :separator => ' > ' %>
</div>
<div class="row margin-row">
  <div class="separador"></div>
  <div class="row small-12 centered">
    <div class="small-8 columns">
      <h1>Cargar Archivo</h1>
    </div>

  </div>
  <div class="row small-12 centered">
    <%= form_tag({:action => 'uploadFile'}, :multipart => true, :onsubmit => 'return validateFileName();') do %>
        <p><label for="upload_file">Seleccione el archivo a cargar:</label>
          <%= file_field 'upload', 'datafile' %></p>
        <%= submit_tag 'Subir Archivo' %>
    <% end %>
  </div>
</div>

在我的routes.rb中，我有以下几行

  get 'employees/upload'
  post 'employees/uploadFile'
  get 'employees/uploadValidate'

我不明白为什么如果我有一个redirect_to并且返回导致DoubleRenderError

事实上，正好在该行报告错误

redirect_to employees_uploadValidate_path and return

Answer 1

事实证明不遵循Ruby / Rails约定使用underscore_case作为方法和视图的名称控制器导致问题。

要解决此问题，我将uploadFile方法重构为upload_file并重命名视图以匹配此约定。我将相同的方法应用于upload_validate方法和视图，这解决了问题。

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Answer 2

我会在这里猜测一下。我相信错误发生在您upload方法上。如果我们仔细查看那里，似乎add_breadcrumb方法正在使用路径重定向到某个地方，之后，它仍然会调用render方法。

AbstractController ::即使使用redirect_to并返回，也会报告DoubleRenderError

2 个答案: