Persumi - Level up your writing and blogging with AI Fred Wu ifredwu@gmail.com http://persumi.com/u/fredwu http://persumi.com/u/fredwu/tech/e/blog/t/to_key 2026-05-01T13:42:46.283140Z <![CDATA[<p> Rails 3 has recently <a href="http://github.com/rails/rails/commit/f81c6bc0404ba2a03eed0ec6c08bbac45661305f">renamed <code class="inline">key</code> method to <code class="inline">to_key</code></a>, which consequently rendered <a href="http://github.com/jnunemaker/mongomapper">MongoMapper</a> unusable.</p> <p> You might see an error that looks like:</p> <pre><code>ActionView::Template::Error (undefined method `to_key' for #<Post:0x000001066e4020>)</code></pre> <p> After some twiddling I’ve <a href="http://github.com/fredwu/mongomapper/commit/6e5e531312ef98c30e33286a1f80dd000468ed07">submitted a patch</a> to address this issue. Feel free to pull my fork until the fix makes its way into <a href="http://github.com/jnunemaker/mongomapper">John Nunemaker’s main repository</a>.</p> ]]> 2010-03-17T08:54:34.000000Z Fred Wu ifredwu@gmail.com http://persumi.com/u/fredwu http://persumi.com/u/fredwu/tech/e/blog/p/rails-mongomapper-on-rails-3-master-undefined-to-key-method 2010-03-17T08:54:34.000000Z