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copied!<p>Thanks to samuelkadolph for helping me in the #rubyonrails IRC channel today. He provided a solution in <a href="https://gist.github.com/745821" rel="nofollow">this gist</a>, copied below for convenience:</p> <pre><code>def custom_respond_with(*resources, &block) options = resources.extract_options! if options[:callback] old_block = block block = lambda do |format| old_block.call(format) if block_given? format.json { render :json => [] } end end respond_with(*(resources << options), &block) end </code></pre> <p>I haven't tried this in my application yet, but I can see that it should work. He also confirmed that I could similarly override the <code>respond_with</code> method itself simply by changing the name of this method and changing the last line of the definition to <code>super(*(resources << options), &block)</code>.</p> <p>I think this will work for me. However, I'm still interested in knowing how to write a custom responder to do the job. (It would be a more elegant solution, IMHO.)</p> <p><strong>Update:</strong> I tried this in my application and it works with some minor changes. Here is the version I'm using now in the <code>private</code> section of my ApplicationController, designed to automatically provide the <code>:callback => params[:callback]</code> option to JSON requests:</p> <pre><code>def custom_respond_with(*resources, &block) options = resources.extract_options! if params[:callback] old_block = block block = lambda do |format| old_block.call(format) if block_given? format.json { render :json => resources, :callback => params[:callback] } end end respond_with(*(resources << options), &block) end </code></pre> <p>Note that I had to change <code>if options[:callback]</code> to <code>if params[:callback]</code> in order to get it working.</p>

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