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    <p>I've been struggling with the exact same problem. I might have found a solution.</p> <p>I found some clues while reading the Renderers.add source code for :json and :xml (link is for Rails 3.0.10 code, 3.1 might have some changes already): <a href="https://github.com/rails/rails/blob/v3.0.10/actionpack/lib/action_controller/metal/renderers.rb">https://github.com/rails/rails/blob/v3.0.10/actionpack/lib/action_controller/metal/renderers.rb</a></p> <p>First, add a simple <code>as_csv</code> method to your model definition:</p> <pre><code>class Modelname &lt; ActiveRecord::Base # ... def as_csv attributes end end </code></pre> <p>This can be anything, just make sure to return a hash with key/value pairs. A Hash works better than an Array, as with keys you're able to add a header row to the CSV output later on. The idea for <code>as_csv</code> comes from Rails' <code>as_json</code> method, which return a Ruby object that is used by <code>to_json</code> to generate the actual JSON (text) output.</p> <p>With the <code>as_csv</code> method in place, put the following code in a file in <code>config/initializers</code> inside your app (name it <code>csv_renderer.rb</code>, for example):</p> <pre><code>require 'csv' # adds a .to_csv method to Array instances class Array alias old_to_csv to_csv #keep reference to original to_csv method def to_csv(options = Hash.new) # override only if first element actually has as_csv method return old_to_csv(options) unless self.first.respond_to? :as_csv # use keys from first row as header columns out = first.as_csv.keys.to_csv(options) self.each { |r| out &lt;&lt; r.as_csv.values.to_csv(options) } out end end ActionController::Renderers.add :csv do |csv, options| csv = csv.respond_to?(:to_csv) ? csv.to_csv() : csv self.content_type ||= Mime::CSV self.response_body = csv end </code></pre> <p>And finally, add CSV support to your controller code:</p> <pre><code>class ModelnamesController &lt; ApplicationController respond_to :html, :json, :csv def index @modelnames = Modelname.all respond_with(@modelnames) end # ... end </code></pre> <p>The initializer code is largely based on the :json and :xml behaviour from the Rails source code (see link above).</p> <p>Currently, the <code>options</code> hash passed to the block doesn't get passed to the <code>to_csv</code> call, as CSV is quite picky on which options it allows to be sent. Rails adds some default options by itself (like :template and some others), which gives you an error when passing them to <code>to_csv</code>. You can change the default CSV rendering behaviour by adding your own preferred CSV options to the initializer, of course.</p> <p>Hope this helps!</p>
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