However, there will always be situations when you need something custom.
The template node is the solution and in this tutorial we’ll show you a quick example of using it to create your own UI widget.
First, increment any document that has "items.item_name" equal to "my_item_two".
For this you'll have to use the positional "$" operator. We can push a new item to an array without a "my_item_two" as follows: For your question #2, the answer is easier.
The answer from Kalhara is correct if you know the position of the embedded document in your array, however there is an alternative approach that can be used to update the first matching array element without knowing the position.
Assuming you update with a single array in your query criteria, the positional operator (@zouhair The Wriite Result indicates that a matching document was not found, so you need to adjust your criteria.
To avoid this, you can use optimistic locking, especially if the array is not modified every second.For question #1, you should still be able to do it in two parts by adding the user_id to the query bit of each of the updates (I'll modify the answer accordingly).Will have to think more about whether it's possible to do in a single [email protected] regarding the 3rd and 4th params, docs.mongodb.com/manual/reference/method/db.collection.update indicates these options are for "upsert" and "multi" respectively.We want our UI element to look as shown on the right of the screen shot below (you can read the tutorials on how to create the Table UI widget and the 2 line chart seperately) To build this widget, we’re going to use a 3rd party Java Script charting library – which is simple, quite powerful, but very easy to use.It has several charts including excellent line and area charts.