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copied!<p>As you can see, the <code>proposition_id</code> parameter is empty, so your controller can't find the proposition unless you give it a valid id.</p> <p>You need to make sure your <code>new</code> form sends the <code>proposition_id</code> attribute. One way to do this is:</p> <ol> <li><p>Set the proposition in the <code>new</code> action in the controller: <code>@micropost.proposition = ...</code></p></li> <li><p>In the form, add a hidden field for the id: <code>f.hidden_field :proposition_id</code></p></li> <li><p>In the <code>create</code> action, find the appropriate Proposition with <code>params[:micropost][:proposition_id]</code></p></li> </ol> <p>(You'll also want to make sure to use <code>attr_accessible</code> in your Micropost model, and make sure <code>proposition_id</code> is NOT in that list. Otherwise, you'll be open to nasty security holes. See <a href="http://www.kalzumeus.com/2010/09/22/security-lessons-learned-from-the-diaspora-launch/" rel="nofollow noreferrer">http://www.kalzumeus.com/2010/09/22/security-lessons-learned-from-the-diaspora-launch/</a> and <a href="https://stackoverflow.com/questions/4651579/which-fields-should-be-protected-from-mass-assignment">Which fields should be protected from mass assignment?</a>)</p> <p>EDIT (due to comment):</p> <p>Your new action should be like this:</p> <pre><code>def new @micropost = Micropost.new @micropost.proposition_id = params[:proposition_id] </code></pre> <p>This is slightly different from what is said above, and is due to the fact you're sending the proposition id in the request to <code>new</code>. There's no need to look up the actual proposition record, since we're only interested in the <code>id</code> field (which we already have).</p>

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