<% comment_id = 0 %>
<% for book_num in 0..4 %>
  <% for comment_num in 0..50 %>
book_<%= book_num %>_comment_<%= comment_num %>:
  id: <%= comment_id %>
  body: This is comment <%= comment_num %> on book <%= book_num %>.
  author_id: <%= book_num.even? ? comment_id % 2 : (comment_id % 2) + 2 %>
  book_id: <%= book_num %>
  approved: <%= comment_num.even? %>
  <% comment_id = comment_id + 1 %>
  <% end %>
<% end %>