ozzo validation v4 returns field #0 not found in structure

When using Ozzo validation v4 in PHP, you may encounter a common error message: "ozzo validation v4 returned field #0 not found in structure". This error message indicates that the validator cannot find the specified field in the data structure. This may be caused by incorrect field names, mismatched data structures, or incorrectly set validation rules. Before solving this problem, we need to double-check the code and validation rules to ensure that the field names are specified correctly and match the data structure. With careful troubleshooting and debugging, we can easily resolve this issue and get the code running smoothly.

Question content

I am using "github.com/go-ozzo/ozzo-validation/v4". This is my structure:

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"`
}

This is the verification method:

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
}

This is the request I sent:

{
    "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
}

I get this error:

field #0 cannot be found in the struct

Solution

validatestruct The first parameter is structptr:

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

This parameter is missing from your code. Unfortunately, the compiler cannot catch such errors.

This is the corrected implementation (note that uui should also be 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
}

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