Working with Header Attributes

You can use the Expression Evaluator or any scripting processor to create or update record header attributes. For example, the MongoDB destination requires a CRUD operation to be specified in a record header attribute. If the origin providing the data does not generate that information automatically, you can use the Expression Evaluator or scripting processor to set the attribute value.

Record header attributes are string values. You can use record:attribute functions in any expression to include attribute values in calculations.

Important: Record header attributes do not have field paths. When using an attribute in an expression, use just the attribute name, surrounded by quotation marks since attributes are strings, as follows:

 ${record:attribute('<attribute name>')}

For example, the following Expression Evaluator adds the file and offset record header attributes created by the Directory origin to the record: