school-platform/app/views/conversations/_conversation.html.erb

<tr>
  <td>
    <%= link_to conversation.name, conversation %>
  </td>
  <td>
    <% conversation.users.each do |user| %>
      <%= link_to user_url(user), data_toggle: "tooltip", title: user.name do %>
        <%= image_tag user.picture.tiny.url %>
      <% end %>
    <% end %>
  </td>
  <td>
    <b><%= conversation.messages.last.user.name %>:</b> <%= truncate(conversation.messages.last.content) %>
  </td>
</tr>