Rego object.get with multileve key

Question

is there any way to use object.get with multiple level key..?

My input looks like this: { "pipelineParameters" : { "k8" : { "NODES" : "1" }, "ec2": { "NODES" : "0" } }

my data looks like { "key": "pipelineParameters.k8.NODES" }

How can I get value from input based on multilevel key

Sample code

https://play.openpolicyagent.org/p/iR15XnMctP

tsandall · Accepted Answer · 2020-03-12 20:15:23Z

2

The object.get function does not support multi-level keys. You could use the walk function for this if you represent the key as an array:

input = {
    "pipelineParameters" : {
        "k8" : {
            "NODES" : "1"
        },
        "ec2": {
           "NODES" : "0"
        }
    }
}

For example:

> walk(input, [["pipelineParameters", "k8", "NODES"], "1"])
true
> walk(input, [["pipelineParameters", "k8",  "NODES"], x])
+-----+
|  x  |
+-----+
| "1" |
+-----+
> walk(input, [["pipelineParameters", y,  "NODES"], x])
+-----+-------+
|  x  |   y   |
+-----+-------+
| "1" | "k8"  |
| "0" | "ec2" |
+-----+-------+

To convert your key into array you could simply write:

split(key, ".")

For example:

split("pipelineParameters.k8.NODES", ".")
[
  "pipelineParameters",
  "k8",
  "NODES"
]

Putting it all together:

> walk(input, [split("pipelineParameters.k8.NODES", "."), x])
+-----+
|  x  |
+-----+
| "1" |
+-----+

answered Mar 12, 2020 at 20:15

tsandall

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1 Comment

Nuthan Kumar Over a year ago

Thank you. I did not check 18.0 documentation. It worked for me

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