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POAre there any Ruby ORMs which use cursors or smart fetch?
 

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    <p>I'm looking for a Ruby ORM to replace ActiveRecord. I've been looking at Sequel and DataMapper. They look pretty good however none of them seems to do the basic: not loading everything in memory when you don't need it.</p> <p>I mean I've tried the following (or equivalent) on ActiveRecord and Sequel on table with lots of rows:</p> <pre><code> posts.each { |p| puts p } </code></pre> <p>Both of them go crazy on memory. They seem to load everything in memory rather than fetching stuff when needed. I used the <code>find_in_batches</code> in ActiveRecord, but it's not an acceptable solution:</p> <ol> <li>ActiveRecord is not an acceptable solution because we had too many problems with it.</li> <li><p>Why should my code be aware of a paging mechanism? I'm happy to configure somewhere the size of the page but that's it. With <code>find_in_batches</code> you need to do something like:</p> <p>post.find_in_batches { |batch| batch.each { |p| puts p } }</p></li> </ol> <p>But that should be transparent.</p> <p>So is there somewhere a reliable Ruby ORM which does the fetch properly?</p> <hr> <p>Update:</p> <p>As Sergio mentioned, in Rails 3 you can use <code>find_each</code> which exactly what I want. However as ActiveRecord is not an option, except if someone can really convince me to use it, the questions are:</p> <ol> <li>Which ORMs support the equivalent of find_each?</li> <li>How to do it?</li> <li>Why do we need a <code>find_each</code>, while <code>find</code> should do it, shouldn't it?</li> </ol>
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