铁轨上的儿童红宝石4

I am trying to make children of posts with rails 4. The posts is nested resources with user. I want a button in the _form that says "add another post" and and to work with JavaScript. The result of this is to create post and if I want to create more posts with the same post id i will press the button and brings me another form to fill. If you have any questions please comment before you answer.I am trying to make children of posts with rail