In this post, we will get to know how to Update the MongoDB field using value of another field which we can simply do using $set operator where we simply provide the name of the column we want to update where we use ‘$’ and ‘set’ operators in combinations. We have given some explanations below to get to know it better and implement as per our requirements.
Update The Value
Here we have used another column to identify the record where we want to update and for the same, we have given an example of code below where we can find how we could implement and get it done for our requirement and update the latest information in the database.
db. collection.update any(
{ }, // filter to match documents to update
{ $set: { fieldToUpdate: "$field To Get New Value From" } }
)
Here we have used certain keywords which we might need to explanation so we have explained each of the keywords below yo understand it in a better manner so let’s look at the example below.
- Collections as we know it is the name of the MongoDB collection here we used.
- Filed to update is the name of the field that you want to update and here we have updated the same.
- Get New Value From which is the name of the field that contains the value to update filed to update with.
In addition to it the update many() is a method that used to update multiple documents in the collection that match the specified filter. The first argument of the Update many() methods is the filter to match documents to update. In this example, an empty filter { ” ” } is used to match all documents in the collection.
The second argument of the Update many() methods is the update operation. The $set operator which is used to set the value of Field to update to the value of Get New Value From The$ positional operator is used to refer to the value of Field to get New Value From in the same document.
Note that if fields to update and Field to Get New Value From are nested fields, you can use dot notation to refer to them. which we can use anywhere we want to use.
To learn more about how to Update the MongoDB field using the value of another field we may visit: how to Update the MongoDB field using the value of another field by stack over flow.
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