46 lines
1.5 KiB
Ruby
46 lines
1.5 KiB
Ruby
class Hash
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# Return a new hash with all keys converted to strings.
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def stringify_keys
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dup.stringify_keys!
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end
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# Destructively convert all keys to strings.
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def stringify_keys!
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keys.each do |key|
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self[key.to_s] = delete(key)
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end
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self
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end
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# Return a new hash with all keys converted to symbols, as long as
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# they respond to +to_sym+.
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def symbolize_keys
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dup.symbolize_keys!
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end
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# Destructively convert all keys to symbols, as long as they respond
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# to +to_sym+.
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def symbolize_keys!
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keys.each do |key|
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self[(key.to_sym rescue key) || key] = delete(key)
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end
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self
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end
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alias_method :to_options, :symbolize_keys
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alias_method :to_options!, :symbolize_keys!
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# Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch.
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# Note that keys are NOT treated indifferently, meaning if you use strings for keys but assert symbols
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# as keys, this will fail.
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#
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# ==== Examples
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# { :name => "Rob", :years => "28" }.assert_valid_keys(:name, :age) # => raises "ArgumentError: Unknown key(s): years"
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# { :name => "Rob", :age => "28" }.assert_valid_keys("name", "age") # => raises "ArgumentError: Unknown key(s): name, age"
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# { :name => "Rob", :age => "28" }.assert_valid_keys(:name, :age) # => passes, raises nothing
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def assert_valid_keys(*valid_keys)
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unknown_keys = keys - [valid_keys].flatten
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raise(ArgumentError, "Unknown key(s): #{unknown_keys.join(", ")}") unless unknown_keys.empty?
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end
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end
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