import "github.com/revel/revel" type UserController struct { *revel.Controller } func (c UserController) Save(name string, email string, age int) revel.Result { c.Validation.Required(name).Message("Name is required") if c.Validation.HasErrors() { c.Validation.Keep() c.FlashParams() return c.Redirect(UserController.Create) } //code to save user data return c.RenderText("User data saved successfully") }
import "github.com/revel/revel" type AuthController struct { *revel.Controller } func (c AuthController) Login(username string, password string) revel.Result { c.Validation.Required(username).Message("Username is required") c.Validation.Required(password).Message("Password is required") if c.Validation.HasErrors() { c.Validation.Keep() c.FlashParams() return c.Redirect(AuthController.Login) } //code to authenticate user return c.RenderText("User authenticated successfully!") }In both examples, the "github.com/revel/revel" library is used for validation. This package provides built-in validation features to make data validation more convenient and efficient in Go.