How to prevent any two elements from being the same in a random draw?

Question

Here is my code: (Thank you MurifoX)

<% random_bullets = Bullet.all %>
<ul>
  <% 4.times do %>
    <li><%= random_bullets.sample.content %></li>
  <% end %>
</ul>

I would like to know if making a condition is possible to prevent any two "bullets" from having the same content on the page. If so, could I get some help on the issue, maybe a nudge in the right direction?

Answer 1

Just remove them from the pool as they are used:

<% 4.times do %>
  <li><%= random_bullets.delete_at(rand random_bullets.size).content %></li>
<% end %>