Update Documents - Part 3
Explore how to effectively update array fields in MongoDB documents using operators such as $addToSet to avoid duplicates, $inc for incremental changes, $[] for updating all array elements, and $each to apply operations on multiple values. This lesson helps you manage and control document updates with precision.
We'll cover the following...
We'll cover the following...
$addToSet operator
The $addToSet operator is similar to the $push operator, except it only adds the value if it doesn’t already exist.
$ operator
The $ operator is used to update the value of the first element of an array field returned from the filter query.
Below is an example of updating the first value of tags from new to old ...