これが私が思いついたものです:
class Hash
def deep_reject_key!(key)
keys.each {|k| delete(k) if k == key || self[k] == self[key] }
values.each {|v| v.deep_reject_key!(key) if v.is_a? Hash }
self
end
end
ハッシュまたは HashWithIndifferentAccess で機能します
> x = {'1' => 'cat', '2' => { '1' => 'dog', '2' => 'elephant' }}
=> {"1"=>"cat", "2"=>{"1"=>"dog", "2"=>"elephant"}}
> y = x.with_indifferent_access
=> {"1"=>"cat", "2"=>{"1"=>"dog", "2"=>"elephant"}}
> x.deep_reject_key!(:"1")
=> {"1"=>"cat", "2"=>{"1"=>"dog", "2"=>"elephant"}}
> x.deep_reject_key!("1")
=> {"2"=>{"2"=>"elephant"}}
> y.deep_reject_key!(:"1")
=> {"2"=>{"2"=>"elephant"}}