Ruby on Rails如何获取最后一个查询？

Question

I'm having trouble trying to figure out when I reached the end of my query. So what I want to do is list all the records in my database that begin with the letter A which I got however I want to output a message if the query turns out blank. When I try I get a bunch of my custom messages even the query didn't turn out blank. Is there any way to tell if I've reached EOF in ruby on rails?

Sample

    <div id = "content-A">
                <p>A</p>
                <% @animes.each do |anime| %>
                    <% if anime.aname.starts_with?('A') %>
                        <%= link_to anime.aname, {:action => 'list'} %>
                    <% else %>
                        <p>No anime listed in this Category :( </p>
                    <%end%>
                <%end %>
            </div>

Answer 1

I believe you want sth like:

<% animes_group = @animes.group_by {|anime| anime.aname.to_s[0].upcase}
  ('A'..'Z').each do |letter| %>
  <div id="content-<%= letter %>">
  <p><%= letter %></p>
  <% if animes = animes_group[letter] %>
    <% animes.each do |anime| %>
      <%= link_to anime.aname, {:action => 'list'} %>
    <% end %>
  <% else %>
    <p>No anime listed in this Category :( </p>
  <%end%>
<% end %>

You should consider moving some of the logic to the controller here, however what is to be moved depends on many factors like whether @animes are being used anywhere else etc.