Rails: “Next post” and “Previous post” links in my show view, how to?

Question

I\'m new in Rails... smile

In my blog aplication I want to have a \"Previous post\" link and a \"Next post\" link in the bottom of my show view.

How do I do

Answer 1

I used the model methods as below to avoid the issue where id + 1 doesn't exist but id + 2 does.

def previous
  Post.where(["id < ?", id]).last
end

def next
  Post.where(["id > ?", id]).first
end

In my view code, I just do this:

<% if @post.previous %>
  <%= link_to "< Previous", @post.previous %>

<% if @post.next %>
  <%= link_to "Next >", @post.next %>