Rails: Get next / previous record

Question

My app has Photos that belong to Users.

In a photo#show view I\'d like to show \"More from this user\", and show a next and previous photo from that user. I would be

Answer 1

This should work, and I think it's more efficient than the other solutions in that it doesn't retrieve every record above or below the current one just to get to the next or previous one:

def next
  # remember default order is ascending, so I left it out here
  Photo.offset(self.id).limit(1).first
end

def prev
  # I set limit to 2 because if you specify descending order with an 
  # offset/limit query, the result includes the offset record as the first
  Photo.offset(self.id).limit(2).order(id: :desc).last
end

This is my first answer ever posted on StackOverflow, and this question is pretty old...I hope somebody sees it :)