Question

是红宝石的新手。在这里，我试图显示数据库中的图像。为此，我利用此处找到的解决方案 link。但是当我运行脚本时，它会显示错误

No route matches {:action=>"show", :controller=>"attachments_controller", :id=>17} 请问我在这条路线上做错了什么。路线

Rails.application.routes.draw do


   resources :attachments, only: [:index, :new, :create, :destroy]
   root "attachments#create"

   get "attachments/show" => "attachments#show"

end

attachments_controller

class AttachmentsController < ApplicationController
  def show
    @attachment = Attachment.find(params[:id])
    send_data @attachment.data, :filename => @attachment.filename, :type => @attachment.content_type
  end
end

show.html

<%= image_tag url_for(:controller => "attachments_controller", :action => "show", :id => @attachment.id) %>

Answer 1

您提供的错误消息指出：

No route matches {:action=>"show", :controller=>"attachments_controller", :id=>17}

您提供的路线文件显示了您创建的路线：

resources :attachments, only: [:index, :new, :create, :destroy]
get "attachments/show" => "attachments#show"

正在运行的耙路将显示您已经在第一行中创建了4条路，以及一条响应“附件/显示”的路。如果您确实要定义这样的路线，则应尝试：

get "attachments/:id", to: "attachments/show"

您的第一条路线仅对show一词作出响应，并且不提供任何参数。最后一条路线将采用附件之后的所有内容，并将其作为名为“ id”的参数传递给附件控制器的show action。

当然，最简单的方法就是摆脱所有这些，只需将第一条路线更改为：

resources :attachments, only: [:index, :new, :create, :destroy, :show]

让导轨为您创建放映路线与手动定义放映路线完全相同，显然阅读效果要好得多

Answer 2

更改

<%= image_tag url_for(:controller => "attachments_controller", :action => "show", :id => @attachment.id) %>

到

<%= image_tag url_for(:controller => "attachments", :action => "show", :id => @attachment.id) %>

如何在Rails上的ruby中正确显示数据库中的图像

2 个答案: