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    <p>as @Christoph said, if there is a lot of logic involved, implement this as a method in the model ; moreover you could implement this as a <a href="http://api.rubyonrails.org/classes/ActiveRecord/NamedScope/ClassMethods.html#method-i-scope" rel="nofollow">scope</a> :</p> <pre><code>class RptNote &lt; ActiveRecord::Base def self.performance_metric_notes( past_weeks = 4 ) # this will calculate the last sundays for this week + # the nth past weeks, defaults to 4 : last_sundays = (0..past_weeks).map do |n| (Time.now.beginning_of_week - (1+n*7).days).strftime("%Y-%m-%d") end # this will return a relation. Using an array in a where clause # renders a SQL IN selector. self .where( week_of: last_sundays ) .order( :week_of, :market, :measure ) end end </code></pre> <p>... this would even let you refine the results by adding other clauses :</p> <pre><code>RptNote.performance_metric_notes.where( measure: something ) </code></pre> <p>see <a href="http://railscasts.com/episodes/215-advanced-queries-in-rails-3" rel="nofollow">Railscasts #215</a> for more info about relations and queries in rails 3</p> <p><strong>edit :</strong> wooops, my bad, just saw your question was on rails 2. The logic stays the same, except for the query. </p> <p>There is more : if your controller actions use this a lot, you can set a <a href="http://railsbrain.com/api/rails-2.2.2/doc/index.html?a=M000259&amp;name=before_filter" rel="nofollow">before_filter</a> on the controller to auto-fetch the records :</p> <pre><code>before_filter :fetch_notes def fetch_notes @notes = RptNote.performance_metric_notes end </code></pre>
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