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api_version.rb
Ruby
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# based on http://freelancing-gods.com/posts/versioning_your_ap_is
# curl -H "Accept: vnd.myapp+json; version=2"
class ApiVersion
def initialize(version)
@version = version
end
 
def matches?(request)
versioned_accept_header?(request) || @version == 1
end
 
private
 
def versioned_accept_header?(request)
accept = request.headers['Accept']
 
if accept
mime_type, version = accept.gsub(/\s/, "").split(";")
mime_type.match(/vnd\.myapp\+json/) && version == "version=#{@version}"
end
end
end

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