<% 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: 1 book_id: <%= book_num %> <% comment_id = comment_id + 1 %> <% end %> <% end %>