docs: private static Document objectForInsert(Tuple tuple, Document dbObject) {
  		MongoDBTupleSnapshot snapshot = (MongoDBTupleSnapshot) tuple.getSnapshot();
  		for ( TupleOperation operation : tuple.getOperations() ) {
  			String column = operation.getColumn();
  			if ( notInIdField( snapshot, column ) ) {
  				switch ( operation.getType() ) {
  					case PUT:
  						MongoHelpers.setValue( dbObject, column, operation.getValue() );
  						break;
  					case PUT_NULL:
  					case REMOVE:
  						MongoHelpers.resetValue( dbObject, column );
  						break;
  					}
  			}
  		}
  		return dbObject;
  	}