CODEWITHSUNDEEP
node.jsmongodb
user1063287
user1063287

Reputation: 10879

findOneAndUpdate not returning original document

Environment

node -v
v10.0.0
// native driver "mongodb": "^3.0.8",

Desired Behavior

I want to update a document and return the original document.

Actual Behavior

The updated document is being returned, instead of the original document.

What I've Tried

Initially I was looking at findAndModify:

http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#findAndModify

however the docs there say that it is deprecated and to use findOneAndUpdate, findOneAndReplace or findOneAndDelete instead.

So I tried:

collection.findOneAndUpdate(filter, update, function(err, result) {
    if (err) {
        res.send(err);
    } else {

        // find object in array of objects ('statements') and return the 'text' property value
        var old_text = result.value.statements.find(x => x.id === "my_great_id").text;

        console.log(old_text);

    }
});

http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#findOneAndUpdate

The docs say that the option returnOriginal is default, however it is logging the updated value, rather than the original value.

Edit:

The problem was elsewhere in code - the code above works as expected.

Upvotes: 1

Views: 433

Answers (1)

Matiullah Karimi
Matiullah Karimi

Reputation: 1314

By default findOneAndUpdate function returns the original document. But adding {new: false} to the third parameter of findOneAndUpdate function may work in your case.

collection.findOneAndUpdate(filter, update, {new: false}, function(err, result) {
  if (err) {
    res.send(err);
  } else {

    // find object in array of objects ('statements') and return the 'text' property value
    var old_text = result.value.statements.find(x => x.id === "my_great_id").text;

    console.log(old_text);

}});

Upvotes: 1

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