#subdomain
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Setting User’s Locale Based on Domain Name In Rails
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Robby on Rails : Subdomain accounts with Ruby on Rails explained
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store_location with subdomains
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Particletree » Subdomains Development = Sucks
Good reasons to avoid subdomains - pricipally wildard SSL certs are expensive and testing is harder -
Building A Multi-Site Application // RailsTips.org by John Nunemaker
Uses a clever DHH plugin