How one can outline a generic success / error consequence for API responses? – Getting Assist

Your code appears high quality to me. Is the rub that you simply solely need one struct sort? If that’s the case you need to try omitEmpty:

The “omitempty” choice specifies that the sphere must be omitted from the encoding if the sphere has an empty worth, outlined as false, 0, a zero pointer, a zero interface worth, and any empty array, slice, map, or string.

You possibly can outline your struct as follows:

sort End result[T any] struct {
	IsSuccessful bool   `json:"isSuccessful"`
	Worth        *T     `json:"worth,omitempty"`
	Code         string `json:"code,omitempty"`
	Message      string `json:"message,omitempty"`
}

… to the place it simply doesn’t ship the keys when they’re zero values or nil. Because it’s idiomatic to make use of err != nil to find out whether or not one thing went improper, you would additionally doubtlessly simplify your constructor code to one thing like this when you wished:

func NewResult[T any](worth *T, err error) End result[T] {
	if err != nil {
		return End result[T]{
			IsSuccessful: false,
			Code:         http.StatusText(http.StatusInternalServerError),
			Message:      err.Error(),
		}
	}
	return End result[T]{
		IsSuccessful: true,
		Worth:        worth,
	}
}

As a result of once more it’s idiomatic to do resp, err := doSomething() and it will move to simply go resp, err into this NewResult func for my part. Put that along with some trite check code:

sort someItem struct {
	ID    int
	Worth string
}

func foremost() {
	worth := NewResult(&someItem{23, "Whats up"}, nil)
	json.NewEncoder(os.Stdout).Encode(worth)
	errorValue := NewResult[someItem](nil, errors.New("Drawback contacting database."))
	json.NewEncoder(os.Stdout).Encode(errorValue)
}

… will yield:

{"isSuccessful":true,"worth":{"ID":23,"Worth":"Whats up"}}
{"isSuccessful":false,"code":"Inside Server Error","message":"Drawback contacting database."}

Anyway, just a few meals for thought! You possibly can additionally push this to a perform like SendJSON[T any](worth *T, err error, w http.ResponseWriter). That would examine err and if nil, do one factor and if not nil do one other. Right here’s a playground hyperlink with above code: