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我有一个自定义控制器操作，如下所示。我有一个带有复选框的表单，允许我通过使用 Prawn 将所选项目写入 pdf 文件来打印它们。有任何想法吗？

我收到以下错误。

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.

这是控制器的相关部分

class ShipmentsController < ApplicationController
  autocomplete :client, :name, :full => true
  autocomplete :product, :product_name, :full => true, :extra_data => [:product_code, :miller_product_code]

  respond_to :js, :html
def index
  if params[:status]
    @openshipments = Shipment.where(:status => params[:status]).search(params[:search1]).order(sort_column + " " + sort_direction).page(params[:page])
  else
    @shipments = Shipment.search(params[:search]).order(sort_column + " " + sort_direction).page(params[:page])
  end
end
def create
  ...
end
def edit
  ... 
end
def update
  ... 
end
def destroy
  ...
end

def print_open
  @printshipments = Shipment.find(params[:open_shipment_ids])

  respond_to do |format|
    format.pdf do
      @printshipments.each do |shipment|
        pdf = Prawn::Document.new
        pdf.text "bill_of_lading_#{shipment.bill_of_lading}"
       #removed send_data pdf.render, filename: "bill_of_lading_#{shipment.bill_of_lading}"
        File.open("public/bill_of_ladings/bill_of_lading_#{shipment.bill_of_lading}.pdf", "wb") { |f| f << pdf.render }
        shipment.update_attribute(:status, "PRINTED")

      end
    end
  end
  redirect_to shipments_path
end

编辑：我可以通过删除 send_data 行来消除错误，但是我无法让表单重定向到我想要的页面。它只想渲染目录中的 javacript，可能是因为这是一个远程表单。我通过使用以下路线的 form_tag 调用 print_open。

  get '/shipments/status/:status' => 'shipments#index'

当我在 print_open 方法的末尾使用 redirect_to shipping_path 时，它会呈现视图，但浏览器中的 url 仍然显示为：

http://localhost:3000/shipments/status/open

代替：

http://localhost:3000/shipments
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1 回答 1

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由于您正在循环遍历数组并调用send_data每个元素，因此您可能会send_data多次调用。这会给你你收到的例外。

于 2012-06-20T17:43:44.160 回答