app/views/admin/analysis/_nav.html.erb
<div class="row" id="nav-row">
<ul class="nav nav-tabs">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Heating Model Fitting</a>
<div class="dropdown-menu">
<% @aggregate_school.all_heat_meters.each do |heat_meter| %>
<%= link_to heat_meter.mpan_mprn, admin_school_analysis_tab_path(@school, tab: :heating_model_fitting, mpan_mprn: heat_meter.mpan_mprn), class: 'dropdown-item'%>
<% end %>
</div>
</li>
</ul>
</div>