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shanemcd/gist:6538369

Created September 12, 2013 14:28
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gistfile1.rb
# routes.rb
get '/:campaign' => 'campaigns#show', constraints: CampaignConstraint.new
# lib/campaign_constraint.rb
class CampaignConstraint
def matches?(request)
Campaign.exists?(name: request.params[:campaign])
end
end
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