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copied!<p>The solution I ended up with was inspired by both @dsander's answer and @Glex's comment, and uses <a href="http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html" rel="nofollow noreferrer" title="Callbacks">callbacks</a>. I had to first create a <code>name_encoded</code> field (default: <code>false</code>) for the <code>file_spaces</code> table in the database, because already-saved file spaces are not encoded.</p> <p>Then, I created a model to use for callbacks (unfortunately, not the cleanest code):</p> <pre><code>class EncodingWrapper require 'base64' def initialize(attribute) @attribute = attribute.to_s @get_method = @attribute @set_method = @attribute + "=" @get_encoded_method = @attribute + "_encoded" @set_encoded_method = @attribute + "_encoded=" end def before_save(record) set_encoded(record) encode(record) end def after_save(record) decode(record) end # Rails dislikes the after_find callback because it has a potentially # severe performance penalty. So it ignores it unless it is created a # particular way in the model. So I have to change the way this method # works. So long, DRY code. :-/ def self.after_find(record, attribute) # Ugly...but hopefully relatively fast. a = attribute.to_s if record.send(a + '_encoded') record.send(a + '=', Base64.decode64(record.send(a))) end end private def is_encoded?(record) record.send(@get_encoded_method) end def set_encoded(record) record.send(@set_encoded_method, true) end def encode(record) record.send(@set_method, Base64.encode64(record.send(@get_method))) end def decode(record) record.send(@set_method, Base64.decode64(record.send(@get_method))) end end </code></pre> <p>Last, hook the callbacks into the FileSpace model:</p> <pre><code>class FileSpace < ActiveRecord::Base ... before_save EncodingWrapper.new(:name) after_save EncodingWrapper.new(:name) # Have to do the after_find callback special, to tell Rails I'm willing to # pay the performance penalty for this feature. def after_find EncodingWrapper.after_find(self, :name) end ... end </code></pre>

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