Rails replace one hash by another if keys exists - ruby-on-rails

Question

I don't know what's going on but I've got two hashes:
first_hash
{
'Ids' => ['string_first_hash'],
'Description' =>
{
'Url' => 'some_path',
'EventCallback' => {
'Url' => 'some_path',
'WhiteList' => ['string'],
},
'Steps' => [{
'OrderIndex' => 1,
'Recipients' => [
{
'Email' => 'email#first.hash',
'FirstName' => 'first_hash_name',
'LastName' => 'first_hash_last_name',
'LanguageCode' => 'en',
},
],
}],
},
}
And the second one:
template_hash
{
'Ids' => ['template_stirng'],
'Description' => {
'Name' => 'Template_name',
'Subject' => 'template_subject',
'Finish' => false,
'Steps' => [{
'OrderIndex' => 1,
'Recipients' => [
{
'Email' => 'Placeholder =>',
'FirstName' => '',
'LastName' => '',
'LanguageCode' => '',
'DisableEmail' => false,
'IdentificationMethods' => [],
},
],
'RecipientType' => 'Signer',
}],
},
}
Now I want to add first_hash to the template_hash and override only those key/value which exist in both and leave the rest from second_hash unchanged (should be added in the result). I thought all I want to do is:
test = first_hash.merge(template_hash)
But the result is surprising - nothing change, it prints second hash unchanged:
> test
{"SspFileIds"=>["7fcf6021-386d-4f31-a871-a89afb8fb36e"],
"SendEnvelopeDescription"=>
{"Name"=>"1 Recipient",
"EmailSubject"=>"Please sign the enclosed envelope",
"EmailBody"=>"Dear #RecipientFirstName# #RecipientLastName#\n\n#PersonalMessage#\n\nPlease sign the envelope #EnvelopeName#\n\nEnvelope will expire at #ExpirationDate#",
"DisplayedEmailSender"=>"",
"EnableReminders"=>true,
"FirstReminderDayAmount"=>5,
"RecurrentReminderDayAmount"=>3,
"BeforeExpirationDayAmount"=>3,
"DaysUntilExpire"=>28,
"StatusUpdateCallbackUrl"=>"",
"LockFormFieldsAtEnvelopeFinish"=>false,
"Steps"=>
[{"OrderIndex"=>1,
"Recipients"=>
[{"Email"=>"Placeholder:",
"FirstName"=>"",
"LastName"=>"",
"LanguageCode"=>"",
"DisableEmail"=>false,
"AddAndroidAppLink"=>false,
"AddIosAppLink"=>false,
"AddWindowsAppLink"=>false,
"AllowDelegation"=>true,
"AllowAccessFinishedWorkstep"=>false,
"SkipExternalDataValidation"=>false,
"AuthenticationMethods"=>[],
"IdentificationMethods"=>[]}],
"RecipientType"=>"Signer"}]}}
What's going on, am I misunderstand something? I'm using Rails 7 and Ruby 3.
[EDIT]
expected_result
{
'Ids' => ['string_first_hash'],
'Description' => {
'Name' => 'Template_name',
'Subject' => 'template_data_string',
'Finish' => false,
'Steps' => [{
'OrderIndex' => 1,
'Recipients' => [{
'Email' => 'email#first.hash',
'FirstName' => 'first_hash_name',
'LastName' => 'first_hash_last_name',
'LanguageCode' => 'en',
}],
'RecipientType' => 'Signer',
}],
'Url' => 'some_path',
'EventCallback' => {
'Url' => 'some_path',
'WhiteList' => ['string'],
},
},
}

Answer 1

Have you tried using deep_merge? https://apidock.com/rails/Hash/deep_merge
What you want is
test = first_hash.deep_merge(second_hash)