为什么我的 rails AJAX 请求会抛出内部服务器错误

Why does my rails AJAX request throw internal server error?

本文关键字：内部 服务器 错误 我的 rails AJAX 请求 为什么      更新时间：2023-09-26

我有一个表格，其中每行都有一个链接

 <%= link_to 'Delete', [lesson.group, lesson], remote: true,method: :delete%>

我希望链接销毁相应的数据库条目并从表中删除相应的行，而无需重新加载页面。操作是

def destroy
        @lesson = @group.lessons.find(params[:id])
        @lesson.destroy
        respond_to do |format|
            if @lesson
                format.html { redirect_to edit_group_path(@group), notice:'Succesfully deleted lesson' }
                format.js {}
            else
                format.html { redirect_to edit_group_path(@group), notice:'Error!' }
            end
        end
    end

条目被删除，但我只能在重新加载页面时看到更改，并且控制台抛出

DELETE http://localhost:3000/groups/1/lessons/14 500 (Internal Server Error)

从日志中提取：

Started DELETE "/groups/1/lessons/18" for 127.0.0.1 at 2013-10-24 18:39:22 +0400
Processing by LessonsController#destroy as JS
  Parameters: {"group_id"=>"1", "id"=>"18"}
  [1m[36mGroup Load (1.0ms)[0m  [1mSELECT "groups".* FROM "groups" WHERE "groups"."id" = ? LIMIT 1[0m  [["id", "1"]]
  [1m[35mLesson Load (1.0ms)[0m  SELECT "lessons".* FROM "lessons" WHERE "lessons"."group_id" = 1 AND "lessons"."id" = ? LIMIT 1  [["id", "18"]]
  [1m[36m (0.0ms)[0m  [1mbegin transaction[0m
  [1m[35mSQL (4.0ms)[0m  DELETE FROM "lessons" WHERE "lessons"."id" = ?  [["id", 18]]
  [1m[36m (10.0ms)[0m  [1mcommit transaction[0m
Completed 500 Internal Server Error in 35ms
ActionView::MissingTemplate (Missing template lessons/destroy, application/destroy with {:locale=>[:en], :formats=>[:js, :html], :handlers=>[:erb, :builder, :coffee]}. Searched in:
  * "C:/Sites/timetable/app/views"
)

因为你没有处理销毁该对象后应该发生的情况。

respond_to do |format|
        if @lesson
            format.html { redirect_to edit_group_path(@group), notice:'Succesfully deleted lesson' }
            format.js {}
          # ...

这里的format.js {}说"与 destroy.js.erb 或 destroy.html.erb 或类似的东西产生共鸣"，根据您的错误（ActionView::MissingTemplate (Missing template application/destroy with {:locale=>[:en], :formats=>[:js, :html], :handlers=>[:erb, :builder, :coffee]}），您尚未设置。

您要么需要设置该模板，要么渲染另一个动作（例如 render action: ），其中定义了模板。或者你可以做一个重定向（我不确定一个简单的redirect_to在这里是否有效）。但是请求需要以某种方式"结束"，无论是通过渲染还是重定向。

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