module Sinatra::ActiveRecordExtension

def database_file=(path)
  path = File.join(root, path) if Pathname(path).relative? and root
  source = ERB.new(File.read(path)).result
  spec = YAML.respond_to?(:unsafe_load) ? YAML.unsafe_load(source) : YAML.load(source)
  spec ||= {}
  set :database, spec
end