This doesn't feel very Ruby? Basically groups and counts the total number of connectors used in project and is displays a report

connectors_total.html.erb

<h1>Reports#connectors_total</h1>
<p>Find me in app/views/reports/connectors_total.html.erb</p>

<table>
  <tr>
    <th>Connector</th>
    <th class=align-right>Total</th>
    <th class=align-right>Total cost</th>
    <th>Order code</th>
  </tr>

<% @connectors_total.each do |connector| %>
<tr>
  <td><%= connector[:connector_type][:name] %></td>
  <td class=align-right><%= connector[:count] %></td>
  <td class=align-right><%= number_to_currency((connector[:total_cost]), unit: "£") %></td>
  <td><%= connector[:connector_type][:part_code] %>
</tr>

<% end %>
</table>

termination.rb

# Each termination has a connector
class Termination < ActiveRecord::Base
  # Returns an array of connectors
  def self.connectors_total(project)
    Termination.where(project: project).group(:connector_type_id).count(:connector_type_id).map do |id, value|
      connector_type = ConnectorType.find(id)
      { connector_type: connector_type, count: value, total_cost: value*connector_type.cost }
    end
  end
end