Currently I'm working with MongoDB and the oplog has been essential to my app. During development, I noticed that sometimes the oplog contains the same record (change) 3 or 4 times.
After console.logging about every step in the process of updating the database and tracking the oplog, I'm lost.
oplogPO.on('update', function (data) { console.log(data.o) }
Above code displays { '$set': { status: 1000 } } -- sometimes once, but sometimes 3 or 4 times.
Did this happen to anyone else? Can someone explain why this happens?
Also this is my first time posting to stackoverflow, so tell me if I did something wrong ;)
Fixed!
The changes in the oplog are used in sockets, so I put the whole oplog in the connection:
io.on('connection', function(socket){
oplogPO.on('update', function (data) { console.log(data.o) }
socket.emit('updateOrders', {data: "send the socket"});
})
This means that every time I connected, it would increment the amount of repeats.
Fixed code:
var socketStuff
oplogPO.on('update', function (data) {
socketStuff.emit('updateOrders', {data: "send the socket"});
}
io.on('connection', function(socket){
socketStuff = socket
socket.emit('updateOrders', {data: "send the socket"});
})
Maybe not the most elegant way, but it works :)
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