Sortable table columns based on hash & key array - ruby-on-rails

Question

I would like to create sortable columns for my table which tabulates data based on hashes. By following http://railscasts.com/episodes/228-sortable-table-columns?view=asciicast. From what I understand, order method would only work sorting out a Model. What's the best way of sorting out columns for such tables. I have 29 similar tables as mentioned. My codes are as below :-
admins_controller.rb
class AdminsController < ApplicationController
array =[]
User.each do |user|
company_name = Company.find(user.company_id).name
array.push(company_name)
end
company = array.inject(Hash.new(0)) { |h, e| h[e] += 1 ; h }
end
Results of the above the above query would look like this :-
array = [["3M", 4], ["A.P. Møller-Mærsk Group", 10], ["ABB", 14], ["Abbott Laboratories", 12]]
On views :-
admins.html.erb
<table class="table">
<tr>
<th><%= link_to "Company", remote: true, :sort => "hash" %></th>
<th><%= link_to "Value", remote: true, :sort => "key" %></th>
<th><%= link_to "Percentage", remote: true, :sort => "Percentage" %></th>
</tr>
<% if #mentors.try(:any?) %>
<% #mentors.each do |key, value| %>
<tr>
<td><%= key %></td>
<td><%= value %> </td>
<td><%= ((value.to_f/#total_co.to_f).to_f * 100 ).round(2)%> </td>
</tr>
<% end %>
<% else %>
<td> nil </td>
<td> nil </td>
<td> nil </td>
<% end %>
</table>

Answer 1

You could go for a JavaScript / jQuery solution like http://tablesorter.com/docs/
This would allow for sorting in frontend and you would not need to adjust the backend.
If you want to have a backend solution, you could go for sorting by column index. A simple solution would be something like this:
Controller:
class AdminsController < ApplicationController
def index
array =[]
User.each do |user|
company_name = Company.find(user.company_id).name
array.push(company_name)
end
company = array.inject(Hash.new(0)) { |h, e| h[e] += 1 ; h }
sort_column = params.fetch(:sort, 0).to_i
company.sort! { |a, b| a[sort_column] <=> b[sort_column] }
end
end
View:
<table class="table">
<tr>
<th><%= link_to "Company", remote: true, :sort => 0 %></th>
<th><%= link_to "Value", remote: true, :sort => 1 %></th>
<th><%= link_to "Percentage", remote: true, :sort => 1 %></th>
</tr>
<% if #mentors.try(:any?) %>
<% #mentors.each do |key, value| %>
<tr>
<td><%= key %></td>
<td><%= value %> </td>
<td><%= ((value.to_f/#total_co.to_f).to_f * 100 ).round(2)%> </td>
</tr>
<% end %>
<% else %>
<td> nil </td>
<td> nil </td>
<td> nil </td>
<% end %>
</table>
For reverting sort order, you would need to also pass a direction state and probably reverse order.