passing data to a rails partial - ruby-on-rails

Question

Edit: Solution Worked Perfectly.
dom_id
I am trying to pass data to a partial and use it to change roles of a user. Right now it will only change the roles of one user. When it is rendered it only displays and acts on the roles of User.first
Where it is rendered. i pass the user in locals. as per this post I used the second answer because the first one didnt work and gave me errors.
<%= render :partial => 'roles', :locals => { :user => user } %>
Below is the partial _role.html.erb
<div id="roleModal" class="reveal-modal">
<%= semantic_form_for user, :url => user_path(user), :html => {:method => :put } do |f| %>
<h3>Change Role</h3>
<div class="reveal-modal-body">
<%= f.input :roles, :as => :check_boxes, :input_html => { :selected => user.role_ids } %>
</div>
<a class="close-reveal-modal">×</a>
<%= f.action :submit, :as => :button %>
<% end %>
<% #users.each do |user| %>
<tr>
<td><%= link_to user.name, user %></td>
<td><%= user.email %></td>
<td><%= user.created_at.to_date %></td>
<td><%= user.roles.first.name.titleize unless user.roles.first.nil? %></td>
<td>
Change role
<%= render :partial => 'roles', :locals => { :user => user } %>
</td>
</tr>
<% end %>

Answer 1

You had the original question about passing locals to a partial correct. The issue was using non-unique pairs of IDs for revealing your hidden forms. So the reveal links always revealed the first occurence of the div with that ID, thus always changing the role on the first user.
Try updating these two lines to use the Rails dom_id() helper to create unique matching pairs of data-reveal-id to id as per the Foundation reveal modal docs:
<a href="roles#<%= user.id %>" data-reveal-id="<%= dom_id(user) %>"
class="button" type="button">Change role</a>
<div id="<%= dom_id(user) %>" class="reveal-modal">