app/views/users/_live_notifications.html.erb
<span id="all-categories-tracker", style="display: none;"><%= @user.transactions_and_friendships_data_array %></span>
<% notification_types.each do |type| %>
<h3><%= type.capitalize %> Notifications</h3>
<% send("#{type}s_categories").each do |category| %>
<%= render 'notification_category', category: category, user: @user %>
<% end %>
<% end %>