Add users and grades display

surveys.go

@@ -70,6 +70,26 @@ func init() {
 				}
 			}
 		}), loggedUser))
+	router.GET("/api/users/:uid/surveys/:sid/score", apiAuthHandler(func(uauth *User, ps httprouter.Params, body []byte) HTTPResponse {
+		return surveyAuthHandler(func(s Survey, uauth *User, _ []byte) HTTPResponse {
+			return userHandler(func(u User, _ []byte) HTTPResponse {
+				if uauth != nil && ((s.Shown && u.Id == uauth.Id) || uauth.IsAdmin) {
+					if score, err := s.GetScore(&u); err != nil {
+						return APIErrorResponse{err: err}
+					} else if score == nil {
+						return APIResponse{map[string]string{"score": "N/A"}}
+					} else {
+						return APIResponse{map[string]float64{"score": *score}}
+					}
+				} else {
+					return APIErrorResponse{
+						status: http.StatusForbidden,
+						err:    errors.New("Not accessible"),
+					}
+				}
+			})(ps, body)
+		})(uauth, ps, body)
+	}, loggedUser))
 }
 
 func surveyHandler(f func(Survey, []byte) HTTPResponse) func(httprouter.Params, []byte) HTTPResponse {
@@ -142,17 +162,35 @@ func NewSurvey(title string, shown bool, startAvailability time.Time, endAvailab
 }
 
 func (s Survey) GetScore(u *User) (score *float64, err error) {
-	if err = DBQueryRow("SELECT SUM(M.score) FROM (SELECT MAX(score) AS score FROM survey_responses R INNER JOIN survey_quests Q ON Q.id_question = R.id_question WHERE Q.id_survey=? AND R.id_user=? GROUP BY Q.id_question) M", s.Id, u.Id).Scan(&score); err != nil || score == nil {
-		return
+	err = DBQueryRow("SELECT SUM(score)/COUNT(*) FROM student_scores WHERE id_survey=? AND id_user=?", s.Id, u.Id).Scan(&score)
+	if score != nil {
+		*score = *score / 5.0
 	}
+	return
+}
 
-	var questions []Question
-	if questions, err = s.GetQuestions(); err != nil {
-		return
+func (s Survey) GetScores() (scores map[int64]*float64, err error) {
+	if rows, errr := DBQuery("SELECT id_user, SUM(score)/COUNT(*) FROM student_scores WHERE id_survey=? GROUP BY id_user", s.Id); err != nil {
+		return nil, errr
+	} else {
+		defer rows.Close()
+
+		scores = map[int64]*float64{}
+
+		for rows.Next() {
+			var id_user int64
+			var score *float64
+
+			if err = rows.Scan(&id_user, &score); err != nil {
+				return
+			}
+			scores[id_user] = score
+		}
+		if err = rows.Err(); err != nil {
+			return
+		}
 	}
 
-	*score = *score / (float64(len(questions)) * 5.0)
-
 	return
 }