subscribers.yaml

<% 10.times do |i| %>
    
  <%
    # Define these first, since they're being used in the key
    first_name = Faker::Name.first_name
    last_name = Faker::Name.last_name
  %>

"<%= first_name %>_<%= last_name %>":
  id: <%= i + 100 %>
  first_name: <%= first_name %>
  last_name: <%= last_name %>
  created_at: <%= Time.at(rand * (Time.now.to_f - 0.0)) # random time stamp %>
<% end %>