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POHow to DRY up Rails 3 controllers by overriding methods like respond_with?
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  1. POHow to DRY up Rails 3 controllers by overriding methods like respond_with?
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    copied!<p>I'm trying to create a JSONP API for my Rails 3 application. Right now in my controllers, I have a lot of actions which follow this pattern:</p> <pre><code># This is from my users_controller.rb, as an example def index @users = User.all respond_with(@users, :callback =&gt; params[:callback]) end </code></pre> <p>While this works as is, I would like to DRY it up by not having to repeat the <code>:callback =&gt; params[:callback]</code> in every action's call to <code>respond_with</code>. How can I do this?</p> <p><strong>Update:</strong> One thing I've realized that is ugly about my above code is that the <code>:callback =&gt; params[:callback]</code> option will be passed for any response format, not just JSON. The following code is probably more correct:</p> <pre><code>def index @users = User.all respond_with(@users) do |format| format.json { render :json =&gt; @users, :callback =&gt; params[:callback]} end end </code></pre> <p>There are a couple ways I've considered to address this problem, but I can't figure out how to make them work:</p> <ul> <li>Override <code>render</code> (perhaps in the application controller) so that it accepts a <code>:jsonp</code> option that automatically includes the <code>:callback =&gt; params[:callback]</code> parameter. This way I could change the above code to the following, which is somewhat shorter:</li> </ul> <pre><code>def index @users = User.all respond_with(@users) do |format| format.json { render :jsonp => @users} end end</code></pre> <ul> <li>Create a responder that overrides <code>to_json</code> in order to solve my problem. That way I could leave out the block and just call <code>respond_with(@users, :responder =&gt; 'MyResponder')</code> to solve the issue. Or perhaps I could include this code in an application responder using <a href="https://github.com/plataformatec/responders" rel="noreferrer">plataformatec's responders gem</a> so that <code>respond_with(@users)</code> by itself would be sufficient.</li> </ul>
 

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