checker/doc/checkers/same.md

Same Checker

The same checker checks if the given value is equal to the value of the other field specified by its name. If they are not equal, the checker will return the NOT_SAME result. In the example below, the same checker ensures that the value in the Confirm field matches the value in the Password field.

type User struct {
    Password string
    Confirm  string `checkers:"same:Password"`
}

user := &User{
    Password: "1234",
    Confirm:  "1234",
}

mistakes, valid := checker.Check(user)
if !valid {
    // Send the mistakes back to the user
}