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Contents
# DataTransformer is a singleton class that walks ruby data structures (nested
# hashes, arrays, etc..) and lets you transform them based on values or keys
#
# NOTE: DataTransformer is not automatically required, but can be when needed.
module Volt
class DataTransformer
# Takes a hash or array, and nested map's over the values, yielding to
# the block the value. The return value from the block replaces the
# previous value.
# NOTE: This does not yield hashes or arrays.
def self.transform(data, transform_keys=true, &block)
if data.is_a?(Hash)
data.map do |key, value|
key = transform(key, transform_keys, &block) if transform_keys
value = transform(value, transform_keys, &block)
[key, value]
end.to_h
elsif data.is_a?(Array)
data.map do |value|
transform(value, transform_keys, &block)
end
else
# yield to the trasnformer
yield(data)
end
end
# Like #transform, except it only yields keys.
def self.transform_keys(data, &block)
if data.is_a?(Hash)
data.map do |key, value|
key = transform_keys(key, &block)
value = transform_keys(value, &block)
# map the key
[yield(key), value]
end.to_h
elsif data.is_a?(Array)
data.map do |value|
transform_keys(value, &block)
end
else
# no mapping
data
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems