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In my Rails 3.1 app (with Ruby 1.9), I have a Deployer1 class that is in a worker subdirectory below the model directory I am trying to load/instantiate this class dynamically with this code: clazz = item.deployer_class # deployer_class is the class name in a string deployer_class = Object.const_get clazz deployer = deployer_class.new If I dont use namespaces, eg something global like this: class Deployer1 end Then it works fine (deployer_class="Deployer1") - it can load the class and create the object. If I try and put it into a module to namespace it a bit, like this: module Worker class Deployer1 end end It doesnt work (deployer_class="Worker::Deployer1") - gives an error about missing constant, which I believe means it cannot find the class. I can access the class generally in my Rails code in a static way (Worker::Deployer1.new) - so Rails is configured correctly to load this, perhaps I am loading it the wrong way... EDIT: So, as per Vlad's answer, the solution I went for is: deployer_class.constantize.new Thanks Chris

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