将自定义对象作为指针插入Parse中。 [错误]：objectId是无效的字段名称

Question

I have a Product object that I get form database in Parse. So I am trying to create UserFavourites object, that has user_id and the Product object, that already in Parse database.

This is the code:

PFObject *product = [PFObject objectWithClassName:@"Product"];
    product[@"objectId"] = @"8gFcLQ3oZo";
    userFavourite[@"product"] = product;
    userFavourite[@"user"] = [[PFUser currentUser] objectId];
    [userFavourite saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (succeeded) {
            // The object has been saved.
        } else {
            // There was a problem, check error.description
        }
    }];

I took those values that I assign, form db. This is just for testing. However, I get the error:

[Error]: objectId is an invalid field name (Code: 105, Version: 1.7.1)

This is because of I am setting objectId. But when I remove this like, for setting objectId, the Product object gets inserted to Product table as new object (dublicating exisitng one, but with new objectId). I thought that I need to specify objectId, so that it would not get inserted as new object. So, what is the right way to achieve my goal?

Answer 1

尝试这样设置objectId ：

 [product setObjectId:@"myId"];