Question

I’m trying to add Prevous/Next links in my show view. Here is the model:

Position
belongs_to :skill

Skill
has_many :positions, :order => 'salary desc, id desc'

position/show view:

<%= link_to("Previous", @position.previous) if @position.previous %>
<%= link_to("Next", @position.next) if @position.next %>

position.rb (new lines added for readibility)

def next
  self.class
  .where("skill_id = ? AND salary <= ? AND id < ?", skill_id, salary, id)
  .order("salary desc, id desc").first
end

This doesn’t do what I want. Records should be ordered first by salary, and than by id.

I think will_paginate won’t help me because it’s only for collections (won’t work in the show view)

Answer 1

I found the solution 🙂 It’s rather long, but it works:

where("skill_id = ? AND salary = ? AND id < ?
       OR 
       skill_id = ? AND salary < ?",
       skill_id, salary, id, skill_id, salary
     )
     .order("salary desc, id desc").first