Hello,
I have a nested json field in my logs called "instanceId" :
"responseElements": { "instancesSet": { "items": [ { "instanceId": "i-02669ced00e8a3701", "currentState":{ "code": 32, "name": "shutting-down" }, "previousState": { "code": 16, "name": "running" } }, { "instanceId": "i-0050374c0e0a6306a", "currentState":{ "code": 32, "name": "shutting-down" }, "previousState": { "code": 16,"name": "running" } } ] } }
As you can see there are two values for instanceId in this log (some logs will have many more). What I want to do is to extract all of the values of instanceId and put them into a new array field called "resp_instance_id".
This ruby code does not work as it doesn't create an array field:
ruby {
code => '
response_item_size = event.get("[responseElements][instancesSet][items]").length
response_item_size.times do |index|
event.set("[resp_instance_id][#{index}]", event.get("[responseElements][instancesSet]
[items][#{index}][instanceId]"))
end
'
}
This results in this strange looking field:
Which in turn produces multiple fields in our platform like this (there are more than just two in this case):
What I want is an array field with the instead, like this:
"resp_instance_id" => [
[0] i-02669ced00e8a3701
[1] i-0050374c0e0a6306a
]
I don't wan't to hardcode this by referencing the elements of instanceId manually, like this:
[responseElements][instancesSet][items][0][instanceId]
[responseElements][instancesSet][items][1][instanceId]
Because instanceId will have an unknown number of values (not just two as in this example).
I have tried using a loop in ruby to create a ruby array witch contains all of the elements of "instanceId" and was successful in creating that array. However, I was unable to do an add_field using that array of values. It seems that add_field can not be included in a loop in the ruby code, but rather must come after the closing ' of the ruby code block. I do know if you use "add_field" to create the same field multiple times with different values that the resulting field will be an array field. But, without being able to use "add_field" inside of the ruby loop, this does not seem possible.