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PORails.cache error in Rails 3.1 - TypeError: can't dump hash with default proc
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  1. PORails.cache error in Rails 3.1 - TypeError: can't dump hash with default proc
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    copied!<p>I running into an issue with the Rails.cache methods on 3.1.0.rc4 (ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10]). The code works fine within the same application on 2.3.12 (ruby 1.8.7 (2011-02-18 patchlevel 334) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2011.03), but started returning an error following the upgrade. I haven't been able to figure out why yet.</p> <p>The error seems to occur when trying to cache objects that have more than one scope on them.</p> <p>Also, any scopes using lambdas fail regardless of how many scopes.</p> <p>I have hit failures from these patterns:</p> <pre><code>Rails.cache.fetch("keyname", :expires_in =&gt; 1.minute) do Model.scope_with_lambda end Rails.cache.fetch("keyname", :expires_in =&gt; 1.minute) do Model.scope.scope end </code></pre> <p>This is the error that I receive:</p> <pre><code>TypeError: can't dump hash with default proc from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:627:in `dump' from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:627:in `should_compress?' from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:559:in `initialize' from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:363:in `new' from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:363:in `block in write' from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:520:in `instrument' from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:362:in `write' from /project/shared/bundled_gems/ruby/1.9.1/gems/activesupport-3.1.0.rc4/lib/active_support/cache.rb:299:in `fetch' from (irb):62 from /project/shared/bundled_gems/ruby/1.9.1/gems/railties-3.1.0.rc4/lib/rails/commands/console.rb:45:in `start' from /project/shared/bundled_gems/ruby/1.9.1/gems/railties-3.1.0.rc4/lib/rails/commands/console.rb:8:in `start' from /project/shared/bundled_gems/ruby/1.9.1/gems/railties-3.1.0.rc4/lib/rails/commands.rb:40:in `&lt;top (required)&gt;' from script/rails:6:in `require' from script/rails:6:in `&lt;main&gt;' </code></pre> <p>I have tried using the :raw => true option as an alternative, but that isn't working because the Rails.cache.fetch blocks are attempting to cache objects.</p> <p>Any suggestions? Thanks in advance!</p>
 

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