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Ruby | YAML.safe_load で Datetime型のオブジェクトを復元できない

Last updated at Posted at 2017-10-13

反省

基本ドキュメントを読もう。

問題

require 'date'
require 'yaml'

Datetime のオブジェクトを YAML に変える

datetime = DateTime.now
=> #<DateTime: 2017-10-13T18:01:34+09:00((2458040j,32494s,84665000n),+32400s,2299161j)>
datetime.to_yaml
=> "--- !ruby/object:DateTime 2017-10-13 18:01:34.084665000 +09:00\n...\n"

YAML.load は出来る

YAML.load(datetime.to_yaml)
=> #<DateTime: 2017-10-13T18:01:34+09:00 ((2458040j,32494s,84665000n),+32400s,2299161j)>

YAML.safe_load が出来ない

YAML.safe_load(datetime.to_yaml)
Psych::DisallowedClass: Tried to load unspecified class: DateTime
from

環境

  • ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin16]

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