I need to validate that a struct value is correct and this means I need to check every field individually, which is easy for a small number of small structs but I was wondering if there's a better way to do it. Here's how I'm doing it right now.
type Event struct {
Id int
UserId int
Start time.Time
End time.Time
Title string
Notes string
}
func (e Event) IsValid() error {
if e.Id <= 0 {
return errors.New("Id must be greater than 0")
}
if e.UserId <= 0 {
return errors.New("UserId must be greater than 0")
}
if e.End <= e.Start {
return errors.New("End must be after Start")
}
if e.Start < time.Now() {
return errors.New("Cannot create events in the past")
}
if e.Title == "" {
return errors.New("Title cannot be empty")
}
return nil
}
Is this the idiomatic way to validate the values of fields in a struct? It looks cumbersome.
I don't see any other way to do this quickly. But I found a go package which can help you with this: https://github.com/go-validator/validator
The README file gives this example:
type NewUserRequest struct {
Username string `validator:"min=3,max=40,regexp=^[a-zA-Z]$"`
Name string `validator:"nonzero"`
Age int `validator:"min=21"`
Password string `validator:"min=8"`
}
nur := NewUserRequest{Username: "something", Age: 20}
if valid, errs := validator.Validate(nur); !valid {
// values not valid, deal with errors here
}
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