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Pastable version of Need to DRY this if-else up

<pre class='prettyprint' language='ruby'>def show if params[:course_id] &amp;&amp; permitted_to?(:browse, :videos) @course = Course.find(params[:course_id]) @video = @course.videos.find(:first) add_crumb(&quot;Watching #{@video.title}&quot;, course_video_path(@course, @video)) elsif params[:course_id] @course = Course.find(params[:course_id]) @video = @course.videos.find(params[:id]) add_crumb(&quot;Watching #{@video.title}&quot;, course_video_path(@course, @video)) elsif !permitted_to?(:browse, :videos) @video = Video.find(params[:id]) add_crumb(&quot;Watching #{@video.title}&quot;, video_path(@video)) end</pre> <a href="http://www.refactormycode.com/codes/802-need-to-dry-this-if-else-up" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>