When a exception occured in execution, the error message is transfered to the next executions. (#592)

* Update Helpers.cs

* Whenever an exception is occured in an execution. Error message will be transfered to the next runs.

---------

Co-authored-by: YogeshPraj <[email protected]>

Author: taskinozdemir

src/RulesEngine/HelperFunctions/Helpers.cs

@@ -18,17 +18,17 @@ internal static class Helpers
         internal static RuleFunc<RuleResultTree> ToResultTree(ReSettings reSettings, Rule rule, IEnumerable<RuleResultTree> childRuleResults, Func<object[], bool> isSuccessFunc, string exceptionMessage = "")
         {
             return (inputs) => {
-
                 var isSuccess = false;
                 var inputsDict = new Dictionary<string, object>();
+                string finalMessage = exceptionMessage;
                 try
                 {
                     inputsDict = inputs.ToDictionary(c => c.Name, c => c.Value);
                     isSuccess = isSuccessFunc(inputs.Select(c => c.Value).ToArray());
                 }
                 catch (Exception ex)
                 {
-                    exceptionMessage = GetExceptionMessage($"Error while executing rule : {rule?.RuleName} - {ex.Message}", reSettings);
+                    finalMessage = GetExceptionMessage($"Error while executing rule : {rule?.RuleName} - {ex.Message}", reSettings);
                     HandleRuleException(new RuleException(exceptionMessage,ex), rule, reSettings);
                     isSuccess = false;
                 }
@@ -38,11 +38,10 @@ internal static RuleFunc<RuleResultTree> ToResultTree(ReSettings reSettings, Rul
                     Inputs = inputsDict,
                     IsSuccess = isSuccess,
                     ChildResults = childRuleResults,
-                    ExceptionMessage = exceptionMessage
+                    ExceptionMessage = finalMessage
                 };
 
             };
-            
         }
 
         internal static RuleFunc<RuleResultTree> ToRuleExceptionResult(ReSettings reSettings, Rule rule,Exception ex)

test/RulesEngine.UnitTest/BusinessRuleEngineTest.cs

@@ -836,7 +836,38 @@ public async Task ExecuteRule_RuntimeError_ShouldReturnAsErrorMessage()
             Assert.All(result, rule => Assert.StartsWith("Error while executing rule :", rule.ExceptionMessage));
         }
 
+        [Fact]
+        public async Task ExecuteRule_RuntimeErrorInPreviousRun_ShouldReturnEmptyErrorMessage()
+        {
+            var workflow = new Workflow {
+                WorkflowName = "TestWorkflow",
+                Rules = new[] {
+                    new Rule {
+                        RuleName = "ruleWithRuntimeError",
+                        Expression = "input1.Country.ToLower() == \"india\""
+                    }
+                }
+            };
+
+            var re = new RulesEngine(new[] { workflow }, null);
+            var input = new RuleTestClass {
+                Country = null
+            };
 
+            var result = await re.ExecuteAllRulesAsync("TestWorkflow", input);
+
+            Assert.NotNull(result);
+            Assert.All(result, rule => Assert.False(rule.IsSuccess));
+            Assert.All(result, rule => Assert.StartsWith("Error while executing rule :", rule.ExceptionMessage));
+
+            input.Country="india";
+            result = await re.ExecuteAllRulesAsync("TestWorkflow", input);
+
+            Assert.NotNull(result);
+            Assert.All(result, rule => Assert.True(rule.IsSuccess));
+            Assert.All(result, rule => Assert.Empty(rule.ExceptionMessage));
+        }
+        
         [Fact]
         public async Task ExecuteRule_RuntimeError_ThrowsException()
         {
@@ -1166,4 +1197,4 @@ public bool CheckExists(string str)
         }
 
     }
-}
+}