通过SplitJson和MergeContent过滤JSON

Question

I'm building flow in nifi and in the flow I need to filter JSON by a filed. So I decided to split json then merge filtered parts via SplitJson and MergeContent processors. My splitJson proccesor JsonPath is $.items[?(@.name =~ /.*Test.*/i)] so it splits correct but when I want to merge all parts into one json file (Merge Strategy = Defragment) and it merge files but incorrect way. For example:

Input

{ "items": [  { "name": "A" }, { "name": "B" }, { "name": "Test" }, { "name": "Test" } ] }

So I expect from MergeContent Processor this:

[ {"name":"Test"}, {"name":"Test"} ]

but I got

{"name":"Test"}{"name":"Test"}

so this is even not a json

The ideal variant is to merge somehow:

{ "items":[
{"name": "Test"},
{"name": "Test"}
]}

How to merge like this?

Answer 1

Configure MergeContent Processor as described below

• Delimiter Strategy as Text

• Header as [

• Footer as ]

• Demarcator as ,

Now your output flowfile from MergeContent processor will result as

[ {"name":"Test"}, {"name":"Test"} ]