| 1 stringify_keys and symbolize_keys
代码
>> { 'days' => 25, 'spirit' => 'giving', 'wallet' => 'empty' }.symbolize_keys
=> {:wallet=>"empty", :spirit=>"giving", :days=>25}
>> { 'system' => 'wii', :valid_ages => 5..90 }.stringify_keys
=> {"valid_ages"=>5..90, "system"=>"wii"}
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