Question

I have a User model with attributes department and points. I have grouped the users by department and sorted each department by the number of points they contain, as shown below in my home/index view:

Accounting 158
Animal Science 98
Kinesiology 58 

I simply want to get the index of each hash element in the array so I can do something like this:

1. Accounting 158
2. Animal Science 98
3. Kinesiology 58 

This is the code in my home_controller:

class HomeController < ApplicationController  
def index
@users = User.find(:all)
@dep_users = @users.group_by { |u| u.department}
end

And in my home/index view I have this code:

    <% @dep_users.sort.each do |department, users| %>
    <% @p = Array.new() %>

    <%= department %>
    <% for user in users %>
    <% @p << user.points %>
    <% end %>
    <%= @p.inject(:+) %>
    <% end %>
    <% end %>

I have tried using each_with_index on @dep_users as such:

@dep_users.sort.each_with_index do |department, users, index|

but I keep getting this error:

undefined method 'each' for 0:FixNum when I do that

How could I get the index for each hash element in the array?

Answer 1

I think, it’s a bad idea to move so much logic in your views. Better way is to define new method which will return sorted array [[department1, points1], [department2, points2]] in your model. Then call it from your controller to create an instance variable. And this variable in your view with code like this

<ol>
  <% @p.each do |item| %>
    <li><%= item[0] + '&nbsp;' + item[1] %></li>
  <% end %>
</ol>

Let html puts numbers before each item of your list.