How do I partially update an object in MongoDB so the new object will overlay / merge with the existing one

by

I solved it with my own function. If you want to update specified field in document you need to address it clearly.

Example:

{
    _id : ...,
    some_key: { 
        param1 : "val1",
        param2 : "val2",
        param3 : "val3"
    }
}

If you want to update param2 only, it’s wrong to do:

db.collection.update(  { _id:...} , { $set: { some_key : new_info  } }  //WRONG

You must use:

db.collection.update(  { _id:...} , { $set: { some_key.param2 : new_info  } }

So i wrote a function something like that:

function _update($id, $data, $options=array()){

    $temp = array();
    foreach($data as $key => $value)
    {
        $temp["some_key.".$key] = $value;
    } 

    $collection->update(
        array('_id' => $id),
        array('$set' => $temp)
    );

}

_update('1', array('param2' => 'some data'));

More Related Contents:

  1. Find document with array that contains a specific value
  2. Update field in exact element array in MongoDB
  3. MongoDB SELECT COUNT GROUP BY
  4. MongoDB: Updating documents using data from the same document [duplicate]
  5. Auto increment in MongoDB to store sequence of Unique User ID
  6. MongoDB Aggregation: How to get total records count?
  7. Average Aggregation Queries in Meteor
  8. Querying an array of arrays in MongoDB
  9. Is there any option to limit mongodb memory usage?
  10. mongo group query how to keep fields
  11. Auto compact the deleted space in mongodb?
  12. $unwind empty array
  13. How do I start Mongo DB from Windows?
  14. Find all duplicate documents in a MongoDB collection by a key field
  15. MongoDB $gt/$lt operators with prices stored as strings
  16. Couldn’t connect to server 127.0.0.1:27017
  17. Is GridFS fast and reliable enough for production?
  18. Dealing with schema changes in Mongoose
  19. Batch insert/update using Mongoid?
  20. Using stored JavaScript functions in the Aggregation pipeline, MapReduce or runCommand
  21. MongoDB – The argument to $size must be an Array, but was of type: EOO / missing
  22. Build a reactive publication with additional fields in each document
  23. How to flatten a subdocument into root level in MongoDB?
  24. Push to two separate arrays in one update call in mongodb
  25. How to toggle a boolean field in one document with atomic operation?
  26. How to check if an array field contains a unique value or another array in MongoDB?
  27. MongoDB.service failed with result exit-code
  28. MongoDB index/RAM relationship
  29. How to update value of specific embedded document, inside an array, of a specific document in MongoDB?
  30. MongoDB {aggregation $match} vs {find} speed

Leave a Comment