Fiber: 🤔 invalid response with nested struct

[juan55860]

Hi guys

There are two structs (service belongs to request):

package Models

type Service struct {
    Id int `json:"id"`
    DomainId int `json:"domain_id"`
    Address string `json:"address"`
    Hint string `json:"hint"`
    City string `json:"city"`
    Latitude float64 `json:"latitude"`
    Longitude float64 `json:"longitude"`
    RequestId int `json:"request_id"`
    Request Request
}

and

package Models

type Request struct {
    Id int `json:"id"`
    So string `json:"so"`
    UserEmail string `json:"user_email"`
    Lang string `json:"lang"`
}

Now, for the find method

var service Models.Service
db.Find(&service , 1)

the resulset is a service row, but using fiber 2.0.4 with Json method from fiber.Ctx returns this:

{
    "id": 1,
    "domain_id": 1,
    "address": "401 Biscayne Blvd",
    "hint": "Bayside Marketplace",
    "city": "Miami",
    "latitude": 25.778333,
    "longitude": -80.186771,
    "request_id": 1,
    "request": {
        "id": 0,
        "so": "",
        "user_email": "",
        "lang": ""
    }
}

Expected answer

is there an output serializer or how can I solve this?

Thank you very much for the help 👍

tested with github.com/jinzhu/gorm and gorm.io/gorm in fiber 2.0.4 for both cases
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[Fenny]

Could you try

    // ..
    Longitude float64 `json:"longitude"`
    RequestId int     `json:"request_id"`
    Request Request   `json:"request"`
}

[Fenny]

The JSON serializing seems to work fine, so I'm sure the problem is somewhere in your DB lookup.

type Service struct {
    Id        int     `json:"id"`
    DomainId  int     `json:"domain_id"`
    Address   string  `json:"address"`
    Hint      string  `json:"hint"`
    City      string  `json:"city"`
    Latitude  float64 `json:"latitude"`
    Longitude float64 `json:"longitude"`
    RequestId int     `json:"request_id"`
    Request   Request `json:"request"`
}

type Request struct {
    Id        int    `json:"id"`
    So        string `json:"so"`
    UserEmail string `json:"user_email"`
    Lang      string `json:"lang"`
}

func main() {
    app := fiber.New()
    demo := Service{
        Id:        123,
        DomainId:  123,
        Address:   "demo",
        Hint:      "demo",
        City:      "demo",
        Latitude:  123.123,
        Longitude: 123.123,
        RequestId: 123,
        Request: Request{
            Id:        123,
            So:        "demo",
            UserEmail: "demo",
            Lang:      "demo",
        },
    }
    app.Get("/", func(c *fiber.Ctx) error {
        return c.JSON(demo)
    })
    log.Fatal(app.Listen(":3000"))
}

Feel free to re-open this issue 👍

[juan55860]

Could you try

  // ..
  Longitude float64 `json:"longitude"`
  RequestId int     `json:"request_id"`
  Request Request   `json:"request"`
}

this way the same returns

By example in gorm

var service Models.Service
db.Find(&service , 1)

I need the answer when doing the find to be only:

{ "id": 1, "domain_id": 1, "address": "401 Biscayne Blvd", "hint": "Bayside Marketplace", "city": "Miami", "latitude": 25.778333, "longitude": -80.186771, "request_id": 1 }

[Fenny]

Oh you are looking for the omitempty tag

    // ..
    Longitude float64 `json:"longitude"`
    RequestId int     `json:"request_id"`
    Request Request   `json:"request,omitempty"`
}

Or ignore the field completely

    // ..
    Longitude float64 `json:"longitude"`
    RequestId int     `json:"request_id"`
    Request Request   `json:"-"`
}