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Different content in Rails based on UserAgent
Wed, 08/11/2010 - 12:57 — SeanI was recently working on a website built using Rails that needed to render different content for certain user agents. Specifically, we needed simpler versions of certain pages for BlackBerry devices. Here's how I accomplished.
First, I added a new mime-type for BlackBerry by adding the following line to config/initializers/mime_types.rb:
Mime::Type.register_alias "text/html", :blackberry
Next, I added two utility methods to app/controllers/application.rb:
# Checks UserAgent def is_blackberry? ua = request.user_agent return false if ua.nil? return false if ! ua.downcase.index('blackberry') # Don't call the BlackBerry 9800 a BlackBerry, since it has a modern browser # based on WebKit: # Mozilla/5.0 (BlackBerry; U; BlackBerry 9800; en) AppleWebKit/534.1+ (KHTML, Like Gecko) Version/6.0.0.141 Mobile Safari/534.1+ return false if ua.downcase.index('webkit') # Must be a BlackBerry! true end # Sets the respond_to format to blackberry if blackberry def set_blackberry_format if !request.xhr? && is_blackberry? request.format = :blackberry end end
With that in hand, it's easy to render BlackBerry specific content on specific pages:
set_blackberry_format respond_to do |format| format.blackberry format.html format.js { render :layout => false } end
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