app/views/expenses/show.html.erb
<p id="notice"><%= notice %></p>
<p>
<strong>Name:</strong>
<%= @expense.name %>
</p>
<p>
<strong>Date:</strong>
<%= @expense.date %>
</p>
<p>
<strong>Amount:</strong>
<%= @expense.amount %>
</p>
<% unless @expense.file.nil? %>
<p>
<strong>File:</strong>
<%= link_to @expense.file_file_name, file_expense_path(@expense.id) %>
</p>
<% end %>
<%= link_to 'Edit', edit_expense_path(@expense) %> |
<%= link_to 'Back', expenses_path %>