Answers for "lasterrorobject mongodb"

lasterrorobject mongodb

const READ_DOCUMENTATION ; 
https://docs.mongodb.com/manual/reference/command/findAndModify/#lasterrorobject

The lastErrorObject embedded document contains the following fields:
//updatedExisting boolean
  true if an update operation modified an existing document.
//upserted document
	Contains the ObjectId of the inserted document if an update operation with upsert: true resulted in a new document.
//Value
	For /*remove*/ operations, value contains the removed document 
    if the query matches a document.
    If the query does not match a document to remove,
      value contains null.

	For /*update*/ operations, the value embedded document contains 
    the following:

	If the new parameter is not set or is false:

    the pre-modification document if the query matches a document;
    otherwise, null.
    If new is true:

    the modified document if the query returns a match;
    the inserted document if upsert: true and no document matches
    the query;otherwise, null.