there should be a method like `queryCache.hasQueryData`

[Shahzayb]

The default case with queryCache.setQueryData is "If the query does not exist, it will be created and immediately be marked as stale"

1. What if you want to check if query exists or not

2. In case of using queryCache.setQueryData, What to do if you don't want to create query if it does not exist

I did that to resolve 2nd issue:

const oldTimeline = queryCache.getQueryData('timeline');
if (oldTimeline) {
    queryCache.setQueryData('timeline', (groups) => {
        groups.forEach((group, i) => {
            groups[i] = group.filter((post) => post._id !== photoId);
        });
        return groups;
    });
}

As you can see, the above solution is quite cumbersome.

What if there's a method called queryCache.hasQueryData which I can use so I don't have to use
queryCache.getQueryData?

[tannerlinsley]

You can do this:

const query = queryCache.getQuery(queryKey)
// or
const queries = queryCache.getQueries(queryKeyPrefix)

Neither of those will create a query.

[mrlubos]

2. In case of using queryCache.setQueryData, What to do if you don't want to create query if it does not exist

Hey @tannerlinsley, any chance this could be an optional config parameter for setQueryData()? Or is your preferred approach to implement a custom wrapper in apps that require this functionality?