statistics.json

[{ "max" : {
	"label" : "Maximum",
	"value" : "max"
	}
},{ "min" : {
	"label" : "Minimum",
	"value" : "min"
	}
},{ "avg" : {
	"label" : "Average",
	"value" : "avg"
	}
}, { "sum" : {
	"label" : "Sum",
	"value" : "sum"
	}
}]

require 'yaml/store'

store = YAML::Store.new 'yaml.store'

hash = {"max"=>{"label"=>"Maximum", "value"=>"max"},
            "min"=>{"label"=>"Minimum", "value"=>"min"},
            "avg"=>{"label"=>"Average", "value"=>"avg"},
            "sum"=>{"label"=>"Sum", "value"=>"sum"}}

store.transaction { hash.each { |k, v| store[k] = v } }

# Your hash is now persisted to './yaml.store'

store.transaction do
  ["max", "min", "avg", "sum"].each do |key|
    Object.const_set key.capitalize, store[key]
  end
end

Min
#=> {"label"=>"Minimum", "value"=>"min"}

Max
#=> {"label"=>"Maximum", "value"=>"max"}