Hello,
How do you conditionally remove (or add) a field to a document?
E.g., I have a mapper:
Expression โ Target Path
20 โ $field1
10 โ $field2
โโ โ $field3
null โ $field4
So I now have:
[
{
โfield1โ:20
,โfield2โ:10
,โfield3โ:โโ
,โfield4โ:null
}
]
Now for example in pseudo code:
if ( $field2 > 5 ) { delete($.field2) }
if ( $field3 == โโ) {delete($.field3) }
if ( $field4 == null ) { delete($.field4) }
So now it looks like:
[
{
โfield1โ:20
}
]
How can I do that? Note: I can achieve this with a JSON Generator using Apache Velocity, but Iโm hoping there is a way to do this using something like a Mapper.
It would also be OK to do this in the opposite direction, e.g.,
if ( $input <= 4 ) { create($.field2, $input) }
Let me know if you have any questions,
Thanks!
Ish
