[Rails] Share partial among different resources

I am trying to render a file from Subject resource in a User resource
view. I am getting error:
undefined method `each' for nil:NilClass. Apparently @subject is nil
but not sure how to fix this...

Here is User resourve view (users/show.html.erb)
<%= render 'subjects/index' %>

Here is subjects_controller
def show
@subject = Subject.find(params[:id])
...
end

Here is subjects/index.html.erb (The file I want to render)
<% @subjects.each do |subject| %>
<tr>
<td class="hilite_list">
<a href="/books/index_books/<%= subject.id %>"><%=
subject.title %> (<%= subject.questions.count %>)</a>
</td>

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