如何在Controller中显示数据库调用到视图中，以HTML格式查看

I was handed a project from someone else, it's in Ruby On Rails, which I know VERY LITTLE. Basically, there is an EXPORT button, that the user clicks to send data to a CSV. I am tasked with sending this data to the view to be seen in HTML. (Thinking I could use dataTables). I have tried following examples, such as: I was handed a project from someone else, it's