add 'update' (PUT) quote method

backend/handlers.go

@@ -57,7 +57,51 @@ func createQuote(w http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(w).Encode(q)
 }
 
-// DELETE /quotes
+// PUT /quotes/{id}
+func updateQuote(w http.ResponseWriter, r *http.Request) {
+	// get ID from URL
+	idParam := chi.URLParam(r, "id")
+	id, err := strconv.Atoi(idParam)
+	if err != nil {
+		http.Error(w, "Invalid ID", http.StatusBadRequest)
+		return
+	}
+
+	// parse request body
+	var q Quote
+	err = json.NewDecoder(r.Body).Decode(&q)
+	if err != nil {
+		http.Error(w, "Invalid JSON", http.StatusBadRequest)
+		return
+	}
+
+	// update DB
+	commandTag, err := db.Exec(
+		context.Background(),
+		`UPDATE hlaskovnik
+		 SET author=$1, body=$2
+		 WHERE id=$3`,
+		q.Author, q.Body, id,
+	)
+	if err != nil {
+		http.Error(w, err.Error(), 500)
+		return
+	}
+
+	// check if row exists
+	if commandTag.RowsAffected() == 0 {
+		http.Error(w, "Quote not found", http.StatusNotFound)
+		return
+	}
+
+	// return updated object
+	q.ID = id
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(q)
+}
+
+// DELETE /quotes{id}
 func deleteQuote(w http.ResponseWriter, r *http.Request) {
 	// get id from URL
 	idParam := chi.URLParam(r, "id")

backend/main.go

@@ -17,6 +17,7 @@ func main() {
 	// routes
 	r.Get("/quotes", getQuotes)
 	r.Post("/quotes", createQuote)
+	r.Put("/quotes/{id}", updateQuote)
 	r.Delete("/quotes/{id}", deleteQuote)
 
 	port := os.Getenv("PORT")