question how to prepend constant to attribute in the flow file in Support Questions

how to prepend constant to attribute in the flow file

sdendukuri — Tue, 09 Oct 2018 21:38:06 GMT

I am trying to prepend constant to the attribute in flow file . I was used below flow

Details :

Input : Flow file contains only below value

{"project" :"ABC-11"}

Output : Flow file should has mentioned value

{"_id.project":"ABC-11"}

here prepending _id to the project attribute and followed below flow

source--> updateattribute->replacetext->put file

in updateattribute attribute defined the project filed as below

project ==> ${prepend(_id)projectid}

The Processor is giving error and refereed the nifi expression language guide , There is no function for prepending constant to attribute

Please suggest some idea/thoughts for resolving the issue. Thanks for time and support

Shu_ashu — Sun, 18 Aug 2019 03:07:13 GMT

If your flowfile having only one key,value then use ReplaceText processor and configure the processor as shown below

We are searching for project literal value and replacing that with _id.project by using ReplacementStrategy as LiteralReplace.

Input:

{"project" :"ABC-11"}

Output:

{"_id.project":"ABC-11"}

sdendukuri — Wed, 10 Oct 2018 19:30:12 GMT

Thanks for your time and help