How to force rank songs by vote? - ruby-on-rails

Question

So, I have an app that allows users to up vote/like songs (using this gem). However, I'd like the songs with higher votes to be ranked up the list. As currently, they only appear in the order in which they were uploaded. How do I accomplish this?
songs#index.html.erb
<div id="layout-1">
<div class="left-side">
<h3>Songs</h3>
<ol>
<% #songs.each do |song| %>
<li><%= link_to song.title, song %><br></li>
<%=link_to '&#9650'.html_safe, vote_for_song_path(song), :remote => true, :method => :put %>
<%#=link_to '&#9660'.html_safe, vote_against_song_path(song), :remote => true, :method => :put %> |
Submitted <%= time_ago_in_words(song.created_at) + " ago" %>
<span class="comments"> | <%= pluralize(song.comments.size, 'comment') %></span> | <span class="votes"><%= pluralize(song.votes.count, 'like') %></span><br />
<%#= link_to 'Show', song, class: "button small secondary" %>
<%= link_to('Edit', edit_song_path(song), class: "button small secondary") if can? :update, song %>
<%= link_to('Destroy', song, method: :delete, data: {confirm: 'Are you sure?'}, class: "button small secondary") if can? :destroy, song %>
<% end %>
</ol>
</div>
<div class="right-side">
<%= image_tag('delorean.jpg')%>
</div></div>
<br />
songs_controller.rb
class SongsController < ApplicationController
before_filter :authenticate_user!, only: [:create ,:edit, :update, :destroy, :vote_for_song]
before_action :set_song, only: [:show, :edit, :update, :destroy, :vote_for_song]
def vote_for
#song = Song.find(params[:id])
current_user.vote_for(#song)
respond_to do |format|
format.js { render 'update_votes' }
end
end
def vote_against
#song = Song.find(params[:id])
current_user.vote_against(#song)
respond_to do |format|
format.js { render 'update_votes' }
end
end
# GET /Songs
# GET /Songs.json
def index
#songs = Song.all
end
# GET /Songs/1
# GET /Songs/1.json
def show
#comment = Comment.new(song: #song)
end
# GET /Songs/new
def new
#song = Song.new
end
# GET /Songs/1/edit
def edit
end
# POST /Songs
# POST /Songs.json
def create
#song = Song.new(song_params)
respond_to do |format|
if #song.save
format.html { redirect_to #song, notice: 'Song was successfully created.' }
format.json { render action: 'show', status: :created, location: #song }
else
format.html { render action: 'new' }
format.json { render json: #song.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /Songs/1
# PATCH/PUT /Songs/1.json
def update
respond_to do |format|
if #song.update(song_params)
format.html { redirect_to #song, notice: 'Song was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #song.errors, status: :unprocessable_entity }
end
end
end
# Song /Songs/1
# Song /Songs/1.json
def destroy
#song.destroy
respond_to do |format|
format.html { redirect_to songs_url }
format.json { head :no_content }
end
end
private
def set_song
#song = Song.find(params[:id])
end
def song_params
params.require(:song).permit(:title, :artist, :bio, :track, :user_id)
end
end

Answer 1

Your Song model should have a plusminus field or somesuch (looking at the gem briefly, that looks like plusminus, which is the sum of up plus down votes), which counts the number of thumbs-ups a given song has received. Then, simply query with a sort on that field:
def vote_for
#song = Song.find(params[:id])
current_user.vote_for(#song)
#song.plusminus = #song.voted_for
#song.save
respond_to do |format|
format.js { render 'update_votes' }
end
end
def index
#songs = Song.order("plusminus")
end