Get name of field referenced by eqfield

[alinnert]

Package version eg. v8, v9:

v9

Issue, Question or Enhancement:

I use the code from the documentation to get the name of a field from its json tag. This works fine on its own.

But if I use the following:

Password        string `json:"password" validate:"required,eqfield=PasswordConfirm"`
PasswordConfirm string `json:"password_confirm" validate:"required"`

I want to create an error message like this:

Error in field "password": should be equal to "password_confirm"

But when I'm creating the error message for password I can't access the err.Field() method of PasswordConfirm which would return password_confirm. I can only access PasswordConfirm through err.Param().

I think there should be additional functions to access the values of the other/referenced field if there is such a reference. E.g.:

err.Field() // "password"
err.OtherField() // "password_confirm"
err.ReferencedField() // alternative name

Same for err.Tag(), err.Type() etc.

Or is there a way to do this now?

Code sample, to showcase or reproduce:

[deankarn]

@alinnert thanks for the issue, I agree it would be nice to have this info at hand. I'll have to think on if further on how to implement.

I'd be happy to accept a PR if you want to take a stab at it :) I don't know when I'll be able to find time to look at it.

[RayendraSabandar]

@alinnert it seems that the value can get fetched using

for _, val := range err.(validator.ValidationErrors) {
  param := val.Param()
  fmt.Println("param:", param)
}