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POWhy does Rails ignore content-type when accepts is different?
 

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  1. POWhy does Rails ignore content-type when accepts is different?
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    <p>I have a RESTful controller:</p> <pre><code>class Api::V1::DevicesController &lt; ApplicationController before_filter :require_user respond_to :json # PUT /api/v1/devices/1 def update @device = Device.find(params[:id]) authorize! :update, @device @device.update_attributes(params[:device]) respond_with @device end end </code></pre> <p>And some JS on the client side:</p> <pre><code>$("#click-me").on('click', function() { $.ajax({ type: "PUT", url: '/api/v1/devices/' + $(this).data('device-id'), dataType: 'json', accept: 'application/json', data: {device: {user_id: null}, format: 'json'}, success: function () { alert("Booya!"); } }) }); </code></pre> <p>When the AJAX gets fired, by default, jQuery sends a JS object as a URL encoded string. And a <code>Content-Type:application/x-www-form-urlencoded</code> which is fine. And because I set <code>dataType</code> to <code>'json'</code>, it sets <code>Accept:application/json, text/javascript, */*; q=0.01</code>, which also seems fine.</p> <p>However when Rails gets the request, it treats the post body as JSON, even tho content-type is URL Encoded. Is this a bug?</p> <p>My solution so far is to cast the JS object as JSON (<code>JSON.stringify({device: {user_id: null}, format: 'json'})</code>) and just submit it.</p> <p>But that doesn't feel very good, surely Rails should handle Content-Type and Accept separately. This app is in 3.0.17. Perhaps it's an issue with earlier versions?</p> <p><strong>UPDATE:</strong></p> <p>Turns out the 422 I was receiving was a validation failure, and Rack is smart enough to deal with varying Content-Type and Accept headers. Duh.</p>
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