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POHow to override to_json in Rails?
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copied!<hr> <h1>Update:</h1> <p>This issue was not properly explored. The real issue lies within <code>render :json</code>.</p> <p>The first code paste in the original question will yield the expected result. However, there is still a caveat. See this example:</p> <p><code>render :json => current_user</code></p> <p>is <strong>NOT</strong> the same as</p> <p><code>render :json => current_user.to_json</code></p> <p>That is, <code>render :json</code> will not automatically call the <code>to_json</code> method associated with the User object. <em>In fact</em>, if <code>to_json</code> is being overridden on the <code>User</code> model, <code>render :json => @user</code> will generate the <code>ArgumentError</code> described below.</p> <h2>summary</h2> <pre><code># works if User#to_json is not overridden render :json => current_user # If User#to_json is overridden, User requires explicit call render :json => current_user.to_json </code></pre> <p>This all seems silly to me. This seems to be telling me that <code>render</code> is not actually calling <code>Model#to_json</code> when type <code>:json</code> is specified. Can someone explain what's really going on here?</p> <p>Any genii that can help me with this can likely answer my other question: <a href="https://stackoverflow.com/questions/2572340/how-to-build-a-json-response-by-combining-foo-to-jsonoptions-and-bars-to-json">How to build a JSON response by combining @foo.to_json(options) and @bars.to_json(options) in Rails</a></p> <hr> <h1>Original Question:</h1> <p>I've seen some other examples on SO, but I none do what I'm looking for.</p> <p>I'm trying:</p> <pre><code>class User < ActiveRecord::Base # this actually works! (see update summary above) def to_json super(:only => :username, :methods => [:foo, :bar]) end end </code></pre> <p>I'm getting <code>ArgumentError: wrong number of arguments (1 for 0)</code> in </p> <pre><code>/usr/lib/ruby/gems/1.9.1/gems/activesupport-2.3.5/lib/active_support/json/encoders/object.rb:4:in `to_json </code></pre> <p>Any ideas?</p>

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