Rails检查User Id是否在Array中

I'm trying to build a condition based on wether or not a "user" is a "member". Basically I need a way of checking if the current_user.id matches any of the user_id of any members. The non-working code I have right now is:

我正在尝试建立一个基于或不是“用户”是“成员”的条件。基本上我需要一种方法来检查current_user.id是否匹配任何成员的任何user_id。我现在的非工作代码是：

<% if current_user = @page.members %>
  you can view this content.
<% end %>

I'm looking for something along the lines of: "If current_user.id exists in the "user_id" of any members."

我正在寻找以下内容：“如果current_user.id存在于任何成员的”user_id“中。”

4 个解决方案

#1

Something like this, based on the field names in your question:

这样的事情，基于你问题中的字段名称：

<% if @page.members.map(&:user_id).include? current_user.id %>
  You can view this content
<% end %>

#2

Assuming your @page.members variable contains an array, you can use the include? method:

假设你的@ page.members变量包含一个数组，你可以使用include吗？方法：

<% if @page.members.include? current_user %>
  you can view this content.
<% end %>

If you're using an array of ids, you will of course need to change the test slightly to look for the current user's id:

如果您正在使用一组id，您当然需要稍微更改测试以查找当前用户的ID：

<% if @page.members.include? current_user.id %>
  you can view this content.
<% end %>

#3

@member_ids = @page.members.map{|m| m.id()}

then check for the condition as below

然后检查以下条件

@memeber_ids.include? current_user.id()

#4

Has said before include? should do the thing.

之前有说过吗？应该做的事情。

I'm just answering to tell you about a gem called CanCan, that gives you easy access for authorization "helpers".

我只是回答告诉你一个名为CanCan的宝石，让你轻松访问授权“助手”。

Why you should use CanCan instead of doing what you are actually doing?

为什么你应该使用CanCan而不是做你实际做的事情？

Don't reinventing the weel most of the times it's a goob practice.
不要在大多数时候重新发明它是一个goob练习。
You are placing business logic on the view (bad practice).
您将业务逻辑放在视图上（不良做法）。
CanCan most likely has been developed thinking on security, and all the best practices in mind.
CanCan很可能已经开发出关于安全性和所有最佳实践的思考。
You save some developing hours.
你节省了一些开发时间。

Sorry if I repeated myself.

对不起，如果我重复自己。

#1