I'm trying to store FIFA Games, and set a scoreboard with a ranking system.
I shouldn't use logic in the view, but if I calculate them in the controller, it renders an error that the method user is not specified. When I put it in the loop, however, it recognizes it because the user is the looped item.
The app can already save games and calculate the winner. The app adds winner_id and loser_id to each game. Later in the scoreboard, I count how many current user_id's from the loop match all games' winner_id's and loser_id's. This keeps the database clean. I don't want to keep the wins and losses in the db because when a game is deleted, it shouldn't count as a win or loss anymore.
Controller:
class ScoreboardController < ApplicationController
def index
@users = User.all
end
end
VIEW:
<div class="panel panel-default" style="margin-left: 10px; margin-right:10px">
<!-- Default panel contents -->
<div class="panel-heading">Scoreboard</div>
<!-- Table -->
<table class="table">
<thead>
<th>#</th>
<th>Username</th>
<th>Ratio</th>
<th>Wins</th>
<th>Losses</th>
</thead>
<% @users.each do |user|%>
<tbody>
<td>
1
</td>
<td>
<%= user.username %>
</td>
<% if (Game.where(:winner_id => user.id).count) == 0 %>
<td>Unvalid</td>
<% elsif (Game.where(:loser_id => user.id).count) == 0 %>
<td>Unvalid</td>
<% else %>
<% @ratio = (number_with_precision((((Game.where(:winner_id => user.id).count).to_f) / (Game.where(:loser_id => user.id).count).to_f), precision: 2)) %>
<td><%= @ratio %></td>
<% end %>
<td>
<%= Game.where(:winner_id => user.id).count %>
</td>
<td>
<%= Game.where(:loser_id => user.id).count %>
</td>
<% end %>
</tbody>
</table>
</div>
I'd like to put this list in the right order. The list should be ordered by ratio. => the @ratio from the view. Can I do this directly?
In the first td, the current position is shown. It shows 1 for every user. How can I make this 1, 2, 3, ...?
You should add those methods in your User model.
class User < ActiveRecord::Base
has_many :wins, class_name: 'Game', foreign_key: 'winner_id'
has_many :losses, class_name: 'Game', foreign_key: 'loser_id'
def ratio
wins.count / losses.count.to_f * 100
end
end
then in the controller :
def index
@users = User.all.sort_by(&:ratio)
end
and in the view, use the user instance methods directly : <%= user.wins.count %>
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