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Contents
# frozen_string_literal: true
require 'active_support/core_ext/array/wrap'
class Hash
# Returns a flat hash where all nested keys are collapsed into a an array of keys.
#
# hash = { person: { name: { first: 'Rob' }, age: '28' } }
# hash.flatten_keys # => {[:person, :name, :first]=>"Rob", [:person, :age]=>"28"}
# hash # => { person: { name: { first: 'Rob' }, age: '28' } }
def flatten_keys
_flatten_keys(self)
end
# Replaces current hash with a flat hash where all nested keys are collapsed into a an array of keys.
# Returns +nil+ if no changes were made, otherwise returns the hash.
#
# hash = { person: { name: { first: 'Rob' }, age: '28' } }
# hash.flatten_keys! # => {[:person, :name, :first]=>"Rob", [:person, :age]=>"28"}
# hash # => {[:person, :name, :first]=>"Rob", [:person, :age]=>"28"}
def flatten_keys!
replace(_flatten_keys(self))
end
private
def _flatten_keys(h, keys = [], res = {})
return res.merge!(keys => h) unless h.is_a? Hash
h.each { |k, r| _flatten_keys(r, keys + Array.wrap(k), res) }
res
end
end
Version data entries
21 entries across 21 versions & 1 rubygems