// CreateDishRatingHandler inserts a new rating into the datastore.
// dish_id parameter must be set to a dish which exists in the datastore and
// rating must be between 1 and 10. User must be logged in.
func CreateDishRatingHandler(w util.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
dishID, err := util.GetIntParam(r, "dish_id", 0)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if !DishExists(c, dishID) {
http.Error(w, "provided dish_id does not exist", http.StatusBadRequest)
return
}
// Check that no rating already exists for this dish
if GetDishRating(c, dishID) != -1 {
http.Error(w, "dish already has a rating from this user", http.StatusBadRequest)
return
}
var ratingData Rating
if err := json.NewDecoder(r.Body).Decode(&ratingData); err != nil {
log.Println("unable to decode create rating data:", err.Error())
http.Error(w, "Unable to decode JSON request body", http.StatusBadRequest)
return
}
if ratingData.Rating > 10 || ratingData.Rating < 1 {
http.Error(w, "rating must be between 1 and 10", http.StatusBadRequest)
return
}
ratingData.DishID = dishID
ratingData.UserID = GetCurrentUserID(c)
ratingData.Timestamp = time.Now()
key := datastore.NewIncompleteKey(c, "Ratings", nil)
newKey, err := datastore.Put(c, key, &ratingData)
if err != nil {
w.WriteJSON(nil, err)
return
}
w.WriteCreated("/api/rating/" + strconv.FormatInt(newKey.IntID(), 10))
}
