Plone：在内容提交期间查询特定文件夹内的原型内容项/对象
是否可以在每次内容提交期间访问或导航同一文件夹下保存的内容项，以便必须验证提交的每个内容以避免提交已存在的内容？我有申请内容类型，成员可以提交申请，但每个成员不应接受超过一份申请。如果是，请帮助我。提前致谢。
Is it possible to access or navigate saved content items under the same folder during every content submission so that every content submitted must be verified to avoid submission of content that already exists? I have application content type where members can submit their applications but shouldn't accept applications more than one per member. If yes, please help me. Thanks in advance.
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替代方案 1：使用 PloneFormGen，制作一个带有按钮和操作适配器的表单。该按钮称为“应用”。操作适配器有一个 python 脚本，用于检查用户是否已经应用，如果是，则重定向到现有项目的编辑视图，如果没有，则调用应用程序文件夹上的 invokeFactory。您可能想隐藏“添加内容”菜单，可能只需使用该位置的 CSS 即可。
替代方案 2：创建一个事件处理程序来拦截在文件夹上创建的内容。也可能适用于内容规则。尝试内容规则并查看它何时生效，否则您可以创建一个可以在正确时间拦截的事件处理程序。人们可以从侦听 zope.event （我相信它被称为或类似的名称）开始，它是所有事件的基类，并记录添加内容时生成的事件。选择一个看起来正确的事件并添加 python 代码，该代码重定向到现有项目的编辑视图，或者如果用户尚未应用，则让内容创建过程继续进行。
Alternative 1: Use PloneFormGen, make a form with a button and an action adapter. The button is called "Apply". The action adapter has a python script that checks if user has already applied, if so redirects to edit view of existing item, if not calls invokeFactory on the Applications folder. You may want to hide the "Add content" menu, possibly simply with CSS for that location.
Alternative 2: Make an event handler that intercepts creating content on the folder. Might also work with a content rule. Try a content rule and see when it kicks in, otherwise you can make an event handler that can intercept at the right time. One can start with listening for zope.event (I believe it's called or somesuch) which is the base class for all events and log the events generated when you add content. Pick an event the seems right and add python code that redirects to edit view of existing item or just lets the content creation process go on if the user has not already applied.