Base Rules and Custom Rules

[nitingautam]

Hi - I have a scenario where I have to create set of Base Rules which then will be overridden for one or more Client specific custom rule which have same name but different definition (Conditions).

In below example I have defined 3 Rules in Base file and 1 Rule in Client Override file.

Before processing Rules in engine - I want Engine to see if any override for that client exist and use that specific Rule instead of base definition for that specific rule. How to achieve this?

Base_Rules

        "Rules": [
            {
                "RuleName": "GiveDiscount10",
                "SuccessEvent": "10",
                "ErrorMessage": "One or more adjust rules failed.",
                "ErrorType": "Error",
                "RuleExpressionType": "LambdaExpression",
                "Expression": "input1.country == \"india\" AND input1.loyaltyFactor <= 2 AND input1.totalPurchasesToDate >= 5000 AND input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 2"
            },
            {
                "RuleName": "**GiveDiscount20**",
                "SuccessEvent": "20",
                "ErrorMessage": "One or more adjust rules failed.",
                "ErrorType": "Error",
                "RuleExpressionType": "LambdaExpression",
                "Expression": "input1.country == \"india\" AND input1.loyaltyFactor == 3 AND input1.totalPurchasesToDate >= 10000 AND input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 2"
            },
            {
                "RuleName": "GiveDiscount25",
                "SuccessEvent": "25",
                "ErrorMessage": "One or more adjust rules failed.",
                "ErrorType": "Error",
                "RuleExpressionType": "LambdaExpression",
                "Expression": "input1.country != \"india\" && input1.loyaltyFactor >= 2 && input1.totalPurchasesToDate >= 10000 && input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 5"
            }
]

ClientA_Rules

[
    {
        "WorkflowName": "Discount",
        "Rules": [
            {
                "RuleName": "**GiveDiscount20**",
                "SuccessEvent": "20",
                "ErrorMessage": "One or more adjust rules failed.",
                "ErrorType": "Error",
                "RuleExpressionType": "LambdaExpression",
                "Expression": "input1.country == \"usa\" AND input1.loyaltyFactor == 4 AND input1.totalPurchasesToDate >= 10000 AND input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 2"
            }
]

community members please guide.

[nitingautam]

I was going through demos and it feels like JSON/DB based rules merge is more of a out of Rule Engine scope work which need to be done before calling the Rule Engine. So various methods like using LINQ/union for two files like base and client specific rules can be utilized.