Collection book list: allow to directly input a position

internal/routes/collectionchangepositionpost.go

@@ -76,7 +76,7 @@ func PostCollectionChangePositionHandler(ac appcontext.AppContext) {
 		newPosition = uint(count)
 	}
 
-	if item.Position == collectionBookPosition.Position {
+	if item.Position == newPosition {
 		//nothing to do
 		ac.C.String(http.StatusOK, "Success")
 		return
@@ -84,11 +84,11 @@ func PostCollectionChangePositionHandler(ac appcontext.AppContext) {
 	lowerPosition := item.Position + 1
 	higherPosition := item.Position - 1
 	operationToDo := ""
-	if item.Position < collectionBookPosition.Position {
-		higherPosition = collectionBookPosition.Position
+	if item.Position < newPosition {
+		higherPosition = newPosition
 		operationToDo = "position - 1"
 	} else {
-		lowerPosition = collectionBookPosition.Position
+		lowerPosition = newPosition
 		operationToDo = "position + 1"
 	}
 
@@ -100,7 +100,7 @@ func PostCollectionChangePositionHandler(ac appcontext.AppContext) {
 		return
 	}
 
-	item.Position = collectionBookPosition.Position
+	item.Position = newPosition
 	ac.Db.Save(&item)
 	ac.C.String(http.StatusOK, "Success")
 }