activerecord organization caching date value conditions clause

my account denote following twin associations:

has_many  :expenses, 
          :order => 'expenses.dated_on desc', 
          :dependent => :destroy

has_many  :recent_expenses, 
          :class_name => 'expense', 
          :conditions => "expenses.dated_on <= '#{date.today}'",
          :order => 'dated_on desc', 
          :limit => 5

in views i'm digest new rubbish so:

<% @account.recent_expenses.each |expense| %>
...
<% finish %>

on growth machine, party server (which runs prolongation mode) also prolongation console, @account.recent_expenses advantage repremand list. however, the live prolongation server, many new rubbish returned.

if i reinstate @account.recent_expenses @account.expenses view, many new rubbish are displayed, speculation #{date.today} biased conditions apportionment somehow being cached initial executed. i restart prolongation dog cluster, latest rubbish returned correctly.

can anyone cruise since start competence i change :recent_expenses query hinder happening?

i'm controlling rails 2.1.0.