Partials always define a local variable with the same name as themselves. E.g. when you are in _recent_users.html.erb, a local variable recent_users will be defined and overshadow any helper method that is also called recent_users().

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If you would like to use a helper method recent_users() in a partial _recent_users.html.erb you can say this in the partial template:

<% recent_users = self.recent_users() %>
<% recent_users.each do |user| %>
  ...
<% end %>