I need help sorting an unread message collection based on user and timestamp. My goal is to group messages by users while keeping the most recent ones at the top. I attempted the following approach:
UnreadMessages.find({},
{sort: {'message.timestamp': -1, 'fromUser._id': 1} });
However, this method does not properly group messages by user.
Is there a more effective way to display the latest messages grouped by user? Any suggestions would be greatly appreciated.
Your current code may produce unexpected results.
If utilizing MongoDB, consider using the code snippet below:
UnreadMessages.find({},
{sort: { 'fromUser._id': 1, 'message.timestamp': -1 } });
However, please note that Minimongo operates differently.
A recent enhancement has been implemented that allows users to define their own comparator function. You can potentially achieve this by creating your custom comparator function as shown below:
function myComparatorFn( a, b ) {
// Custom comparison logic goes here
}
UnreadMessages.find({}, {sort: myComparatorFn });
Unfortunately, it seems like this feature missed the 1.3.3 release according to the commit log.
An additional solution could involve leveraging a package such as and running a MongoDB aggregation pipeline with $group on the server.
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