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class Hash
def slice(*keep_keys)
h = {}
keep_keys.each { |key| h[key] = fetch(key) }
h
end unless Hash.method_defined?(:slice)
def except(*less_keys)
slice(*keys - less_keys)
end unless Hash.method_defined?(:except)
def deep_symbolize_keys
inject({}) { |result, (key, value)|
value = value.deep_symbolize_keys if value.is_a?(Hash)
result[(key.to_sym rescue key) || key] = value
result
}
end unless Hash.method_defined?(:deep_symbolize_keys)
# deep_merge_hash! by Stefan Rusterholz, see http://www.ruby-forum.com/topic/142809
MERGER = proc do |key, v1, v2|
Hash === v1 && Hash === v2 ? v1.merge(v2, &MERGER) : v2
end
def deep_merge!(data)
merge!(data, &MERGER)
end unless Hash.method_defined?(:deep_merge!)
end
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