Remove unused ValidationError

errors.go

@@ -30,16 +30,6 @@ func (e *ParseError) Unwrap() error {
 	return e.Err
 }
 
-// ValidationError is returned when struct validation fails.
-type ValidationError struct {
-	Field   string
-	Message string
-}
-
-func (e *ValidationError) Error() string {
-	return fmt.Sprintf("dotenvgo: validation failed for field %q: %s", e.Field, e.Message)
-}
-
 // MultiError contains multiple errors from struct loading.
 type MultiError struct {
 	Errors []error

errors_test.go

@@ -28,14 +28,6 @@ func TestErrors(t *testing.T) {
 		}
 	})
 
-	t.Run("ValidationError", func(t *testing.T) {
-		err := &ValidationError{Field: "Age", Message: "too low"}
-		expected := "dotenvgo: validation failed for field \"Age\": too low"
-		if err.Error() != expected {
-			t.Errorf("Expected %q, got %q", expected, err.Error())
-		}
-	})
-
 	t.Run("MultiError", func(t *testing.T) {
 		e1 := errors.New("error 1")
 		e2 := errors.New("error 2")

examples/struct/main.go

@@ -9,6 +9,10 @@ import (
 	"github.com/godeh/dotenvgo"
 )
 
+type Database struct {
+	URL string `env:"URL" default:"postgres://localhost:5432/defaultdb"`
+}
+
 // Config defines your application configuration
 type Config struct {
 	// Server settings
@@ -34,6 +38,8 @@ type Config struct {
 	AllowedOrigins []string `env:"ALLOWED_ORIGINS" default:"*"`
 
 	IDs []int `env:"IDS" default:"1,2,3,4,5"`
+
+	DB Database
 }
 
 func main() {
@@ -44,6 +50,7 @@ func main() {
 	os.Setenv("READ_TIMEOUT", "1m")
 	os.Setenv("ALLOWED_ORIGINS", "http://localhost:3000, https://myapp.com")
 	os.Setenv("IDS", "1, 2, 3")
+	os.Setenv("URL", "postgres://localhost:5432/prod")
 
 	// Load configuration
 	var cfg Config
@@ -65,4 +72,5 @@ func main() {
 	fmt.Printf("Max Connections: %d\n", cfg.MaxConnections)
 	fmt.Printf("Allowed Origins: %v\n", cfg.AllowedOrigins)
 	fmt.Printf("IDs:             %v\n", cfg.IDs)
+	fmt.Printf("DB URL:          %s\n", cfg.DB.URL)
 }

loader_test.go

@@ -51,6 +51,9 @@ func TestLoad(t *testing.T) {
 		if cfg.Timeout != 30*time.Second {
 			t.Errorf("Expected Timeout 30s, got %v", cfg.Timeout)
 		}
+		if cfg.secret != "" {
+			t.Errorf("Expected unexported field to remain unset, got %q", cfg.secret)
+		}
 	})
 
 	t.Run("Env Overrides", func(t *testing.T) {