Rule with dynamic parameter

[roneetshaw]

This is my rule

{
    "location": "here",
    "rule": {
        "action": {
            "code": "var msg ='Name :' + who + ' age : '+x; console.log(msg); msg;"
        },
        "condition": {
            "and": [
                {
                    "pattern": {
                        "age": "?x",
                        "name": "?who"
                    }
                },
                {
                    "code": "x >6"
                }
            ]
        },
        "when": {
            "pattern": {
                "age": "?x",
                "name": "?who"
            }
        }
    }
}

In the above JSON, I am checking with constant 6 where age> 6 in my condition, but is there a way where I can pass a variable instead of fix values from the uri: /api/loc/events/ingest For example uri: /api/loc/events/ingest request

{
    "location": "here",
    "event": {
        "age": "8",
        "name": "sonu"
    }
}

The age passed here i.e. 8 should be used in the rule condition and the result should be according to that?

[rakesh-roshan]

Do you want to pass the the value of age and the threshold both in the event digest? You can change the pattern then, to capture that value in a variable. But in the sample even digest, you are passing only the value of age. So 8 will be compared to which value? I think you want to pass both the threshold and the value in the event. e.g.

{
    "location": "here",
    "event": {
        "age": "8",
       "age_threshold": "6",
        "name": "sonu"
    }
}

Then your rule can be,

{
    "location": "here",
    "rule": {
        "action": {
            "code": "var msg ='Name :' + who + ' age : '+x; console.log(msg); msg;"
        },
        "condition": {
            "and": [
                {
                    "pattern": {
                        "age": "?x",
                       "age_threshold": "?t",
                        "name": "?who"
                    }
                },
                {
                    "code": "x > t"
                }
            ]
        },
        "when": {
            "pattern": {
                "age": "?x",
                "age_threshold": "?t",
                "name": "?who"
            }
        }
    }
}

One thing, in the ingest you are passing the value as string so the comparison will be string comparison. I think in the code you should convert the value and threshold to numeric explicitly for numeric comparison.

[roneetshaw]

Thanks @rakesh-roshan for the suggestion. I will try it out and let you know about the result. Thank you so much.

[roneetshaw]

Hi Rakesh, Your solution worked great. Thanks for sharing. However, can we perform comparisons (>, <, etc) at the "pattern" level? and not on "code" level