import ( "github.com/astaxie/beego/validation" ) func main() { name := "John" valid := validation.Validation{} valid.MinSize(name, 5, "name") // Validates that the length of name is at least 5 characters }
import ( "github.com/astaxie/beego/validation" ) type LoginForm struct { Username string `valid:"MinSize(5)"` Password string `valid:"MinSize(8)"` } func login(c *gin.Context) { form := LoginForm{ Username: c.PostForm("username"), Password: c.PostForm("password"), } valid := validation.Validation{} b, err := valid.Valid(&form) if err != nil { // handle error } if !b { // handle validation errors } }In this example, `LoginForm` is a struct used to store the username and password submitted in a login form. The `valid` struct tag is used to specify the minimum size validation for each field. When the `valid.Valid` function is called, the `valid` struct is checked against the validation rules specified in the tags. If any validation errors occur, they will be returned in the `Validation.Errors` field of the `valid` struct. Overall, the Validation MinSize function is a useful tool for validating that strings meet a minimum length requirement in Go applications.