Default Error Messages

package main
import (
    "github.com/gogf/gf/v2/frame/g"
    "github.com/gogf/gf/v2/os/gctx"
)
func main() {
    var (
        ctx    = gctx.New()
        params = map[string]interface{}{
            "passport":  "",
            "password":  "123456",
            "password2": "1234567",
        }
        rules = map[string]string{
            "passport":  "required|length:6,16",
            "password":  "required|length:6,16|same:password2",
            "password2": "required|length:6,16",
        }
    )
    err := g.Validator().Rules(rules).Data(params).Run(ctx)
    if err != nil {
        g.Dump(err.Maps())
    }
}

After execution, the terminal outputs:

{
    "passport": {
        "required": "The passport field is required",
        "length":   "The passport value `` length must be between 6 and 16",
    },
    "password": {
        "same": "The password value `123456` must be the same as field password2",
    },
}

Custom Error Messages

package main
import (
    "github.com/gogf/gf/v2/frame/g"
    "github.com/gogf/gf/v2/os/gctx"
)
func main() {
    var (
        ctx    = gctx.New()
        params = map[string]interface{}{
            "passport":  "",
            "password":  "123456",
            "password2": "1234567",
        }
        rules = map[string]string{
            "passport":  "required|length:6,16",
            "password":  "required|length:6,16|same:password2",
            "password2": "required|length:6,16",
        }
        messages = map[string]interface{}{
            "passport": "账号不能为空|账号长度应当在{min}到{max}之间",
            "password": map[string]string{
                "required": "密码不能为空",
                "same":     "两次密码输入不相等",
            },
        }
    )
    err := g.Validator().Messages(messages).Rules(rules).Data(params).Run(ctx)
    if err != nil {
        g.Dump(err.Maps())
    }
}

This example also demonstrates two data types for passing custom error messages through messages, either string or map[string]string. For map[string]string, you need to specify corresponding error messages for each field and rule, forming a two-dimensional associative array. After executing this example, the terminal outputs:

{
    "passport": {
            "length": "账号长度应当在6到16之间",
            "required": "账号不能为空"
    },
    "password": {
            "same": "两次密码输入不相等"
    }
}