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copied!<p>There are a few options.</p> <p>You can overwrite the <code>as_json</code> method on the model you are working with <a href="http://jonathanjulian.com/2010/04/rails-to_json-or-as_json/" rel="nofollow">http://jonathanjulian.com/2010/04/rails-to_json-or-as_json/</a></p> <p>You can use a json builder<br> <a href="https://github.com/rails/jbuilder" rel="nofollow">jbuilder</a><br> <a href="https://github.com/nesquena/rabl" rel="nofollow">rabl</a></p> <p>You could create a serializer<br> <a href="http://railscasts.com/episodes/409-active-model-serializers" rel="nofollow">http://railscasts.com/episodes/409-active-model-serializers</a></p> <p>or you could use the <code>:only</code> option on <code>to_json</code></p> <pre><code>def index @models = Model.all respond_with(@models) do |format| format.html { render } format.json { render json: @models.to_json( only: [:some_attribute, :some_other_attribute] ) } end end </code></pre> <p>Unless you are using these constraints in many actions I would recommend the last choice (using <code>:only</code> because I believe it to be the simplest but you may feel like the controller isn't the place for this kind of logic.</p> <p>And there are probably many more ways to do this.</p> <p><strong>Edit</strong>:<br> <code>respond_with</code> takes a hash as a second argument to make the above prettier (thanks @ck3g)</p> <pre><code>def index @models = Model.all respond_with @models, only: [:some_attribute, :some_other_attribute] end </code></pre>

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