allow multiple shortened links to a single URL

closes NoLog.cz/gull#3

handlers/handlers.go

@@ -17,7 +17,7 @@ type App struct {
 }
 
 type urlEntry struct {
-	URL   string `gorm:"unique" json:"url"`
+	URL   string `json:"url"`
 	Alias string `gorm:"unique" json:"alias"`
 }
 
@@ -67,18 +67,14 @@ func (a *App) CreateShortURL(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "Invalid Alias", http.StatusBadRequest)
 		return
 	}
-	// Check if URL entry already exists
-	existingURL := &urlEntry{}
-	a.DB.Where("url = ?", u.URL).Find(existingURL)
-	if existingURL.URL != "" {
-		u.Alias = existingURL.Alias
-	} else {
-		// Verify alias is unique
-		for u.Alias == "" || !a.DB.Where("alias = ?", u.Alias).First(existingURL).RecordNotFound() {
-			u.Alias = utils.RandString(6)
-		}
-		a.DB.Create(u)
-	}
+
+    // Verify alias is unique
+    existingURL := &urlEntry{}
+    for u.Alias == "" || !a.DB.Where("alias = ?", u.Alias).First(existingURL).RecordNotFound() {
+        u.Alias = utils.RandString(6)
+    }
+    a.DB.Create(u)
+
 	// Write HTTP Response
 	shortlink := r.Host + "/s/" + u.Alias
 	w.Header().Set("Content-Type", "application/json")