Unique tag seems doent work

[MeNavel]

i create request and using validator like this :

type CreateKtpRequest struct {
NIK string json:"nik" validate:"numeric,min=16,max=16,required,unique=NIK"
Nama string json:"nama" validate:"required"
TempatLahir string json:"tempat_lahir"
TanggalLahir string json:"tanggal_lahir"
JenisKelamin string json:"jenis_kelamin"
Alamat string json:"alamat"
Agama string json:"agama"
Pekerjaan string json:"pekerjaan"
}

but my API produces an error like this
"code": "99",
"message": "Validation Error",
"data": {
"NIK": "Key: 'CreateKtpRequest.NIK' Error:Field validation for 'NIK' failed on the 'unique' tag"
}

I have made sure that the data I entered is not duplicated, all tag working normal except unique tag

[nodivbyzero]

@MeNavel

The unique validation tag is designed for arrays, slices, and maps - not for single string fields.
Since NIK is a string, the unique=NIK validation does not work as expected.

---

From documentation: https://pkg.go.dev/github.com/go-playground/validator/v10#hdr-Unique

For arrays & slices, unique will ensure that there are no duplicates. For maps, unique will ensure that there are no duplicate values. 
For slices of struct, unique will ensure that there are no duplicate values in a field of the struct specified via a parameter.