在使用php中的Ozzo验证v4时，可能会遇到一个常见的错误消息：“ozzo 验证 v4 返回在结构中找不到字段 #0”。这个错误提示表明验证器在数据结构中无法找到指定的字段。这可能是由于字段名称错误、数据结构不匹配或验证规则设置错误等原因引起的。在解决这个问题之前，我们需要仔细检查代码和验证规则，确保正确指定了字段名称并与数据结构相匹配。通过仔细排查和调试，我们可以轻松解决这个问题，让代码顺利运行。

问题内容

我正在使用 "github.com/go-ozzo/ozzo-validation/v4"。 这是我的结构：

type mystruct struct {
    uuid          string `json:"uuid"`
    firstuuid     string `json:"first_uuid"`
    seconduuid    string `json:"second_uuid"`
    thirduuid     string `json:"third_uuid"`
    phonenumber   string `json:"phone_number"`
    email         string `json:"email"`
    skypeid       string `json:"skype_id"`
    city          string `json:"city"`
    comment       string `json:"comment"`
    personnelid   string `json:"personnel_id"`
    firstdate     string `json:"first_date"`
    seconddate    string `json:"second_date"`
    firstboolean  bool   `json:"first_boolean"`
    secondboolean bool   `json:"second_boolean"`
}

这是验证方法：

func (m mystruct) validate() error {
    err := validation.validatestruct(
        validation.field(&uui.personnelid, validation.match(personnelidregexp)),
        validation.field(&uui.uuid, is.uuid),
        validation.field(&uui.firstuuid, validation.required, is.uuid),
        validation.field(&uui.seconduuid, validation.required, is.uuid),
        validation.field(&uui.thirduuid, validation.required, is.uuid),
        validation.field(&uui.email, validation.required, is.email),
        validation.field(&uui.phonenumber, validation.required, validation.match(mobileregexp)),
        validation.field(&uui.city, validation.required),
        validation.field(&uui.comment),
        validation.field(&uui.skypeid, validation.required),
        validation.field(&uui.firstdate, validation.date(time.dateonly)),
        validation.field(&uui.seconddate, validation.date(time.dateonly)),
    )

    return err
}

这是我发送的请求：

{
    "uuid": "1e57ef49-352f-4545-a43a-b51cad6c5a0a",
    "phone_number": "09124567891",
    "email": "[email protected]",
    "skype_id": "some_skype_id",
    "city": "a city",
    "personnel_id": "",
    "comment": "no comment for now!",
    "first_date": "",
    "second_date": "",
    "first_uuid": "94038913-2bdb-4dde-99fb-640a24e1c003",
    "second_uuid": "7fa0e242-841b-4de0-a3ce-e2b54ecd1bca",
    "third_uuid": "35ab6711-852e-42c8-aab3-dfb901a845f5",
    "first_boolean": true,
    "second_boolean": false
}

我收到此错误：

field #0 cannot be found in the struct

解决方法

validatestruct 的第一个参数是 structptr:

func validatestruct(structptr interface{}, fields ...*fieldrules) error

您的代码中缺少此参数。不幸的是，编译器无法捕获此类错误。

这是更正后的实现（请注意，uui 也应该是 m）：

func (m MyStruct) Validate() error {
    err := validation.ValidateStruct(
        &m,  // <== The first parameter is a pointer to the struct.
        validation.Field(&m.PersonnelID, validation.Match(personnelIDRegexp)),
        validation.Field(&m.UUID, is.UUID),
        validation.Field(&m.FirstUUID, validation.Required, is.UUID),
        validation.Field(&m.SecondUUID, validation.Required, is.UUID),
        validation.Field(&m.ThirdUUID, validation.Required, is.UUID),
        validation.Field(&m.Email, validation.Required, is.Email),
        validation.Field(&m.PhoneNumber, validation.Required, validation.Match(mobileRegexp)),
        validation.Field(&m.City, validation.Required),
        validation.Field(&m.Comment),
        validation.Field(&m.SkypeID, validation.Required),
        validation.Field(&m.FirstDate, validation.Date(time.DateOnly)),
        validation.Field(&m.SecondDate, validation.Date(time.DateOnly)),
    )

    return err
}