How do I submit one param multiple times on rails?

So I have Users and Interests and they are associated with a has_and_belongs_to_many relation through an interests_users table. What I want to do is to let users select 5 interests when they create their account through checkboxes, but I don't now how to submit the same param 5 times in the same form and I am currently submiting it with checkbox, but Interest is not a boolean. The code right now is like this:

<div class = "field">
<%= f.label :interests %><br>
<% all_interests = Interest.all.map{ |f| [f.name, f.id] } %>
<% all_interests.each do |interest| %>
  <p> <%= interest[0] %>  <%= f.check_box :interests %> <p>
<% end %>
</div>