Remove a subdocument nested in an array in MongoDB

Question

I want to remove this:

{
\"val\" : NumberLong(200),
\"chId\" : 2,
\"reqSys\" : \"222220005031\",
\"old\" : NumberL         


        

Answer 1

To remove sub document use $pull

This query will remove from nested sub document

 db.collection.update({ d : 2014001 , m :123456789},
                      {$pull : { "topups.data" : {"val":NumberLong(200)} } } )