fix: parsing arrays of enums failing

Author: jthomperoo

QueryKit.UnitTests/FilterParserTests.cs

@@ -208,7 +208,7 @@ public void test_in_operator()
         var input = """(Age ^^ [20, 30, 40]) && (BirthMonth ^^ ["January", "February", "March"]) || (Id ^^ ["6d623e92-d2cf-4496-a2df-f49fa77328ee"])""";
         var filterExpression = FilterParser.ParseFilter<TestingPerson>(input);
         filterExpression.ToString().Should()
-            .Be(""""x => ((value(System.Collections.Generic.List`1[System.Nullable`1[System.Int32]]).Contains(x.Age) AndAlso value(System.Collections.Generic.List`1[System.String]).Contains(x.BirthMonth)) OrElse value(System.Collections.Generic.List`1[System.Guid]).Contains(x.Id))"""");
+            .Be(""""x => ((value(System.Collections.Generic.List`1[System.Nullable`1[System.Int32]]).Contains(x.Age) AndAlso value(System.Collections.Generic.List`1[System.Nullable`1[QueryKit.WebApiTestProject.Entities.BirthMonthEnum]]).Contains(x.BirthMonth)) OrElse value(System.Collections.Generic.List`1[System.Guid]).Contains(x.Id))"""");
     }
 
     [Fact]
@@ -217,7 +217,16 @@ public void simple_in_operator_for_string()
         var input = """BirthMonth ^^ ["January", "February", "March"]""";
         var filterExpression = FilterParser.ParseFilter<TestingPerson>(input);
         filterExpression.ToString().Should()
-            .Be(""""x => value(System.Collections.Generic.List`1[System.String]).Contains(x.BirthMonth)"""");
+            .Be(""""x => value(System.Collections.Generic.List`1[System.Nullable`1[QueryKit.WebApiTestProject.Entities.BirthMonthEnum]]).Contains(x.BirthMonth)"""");
+    }
+    
+    [Fact]
+    public void simple_in_operator_for_enum_code()
+    {
+        var input = """BirthMonth ^^ [1, 2, 3]""";
+        var filterExpression = FilterParser.ParseFilter<TestingPerson>(input);
+        filterExpression.ToString().Should()
+            .Be(""""x => value(System.Collections.Generic.List`1[System.Nullable`1[QueryKit.WebApiTestProject.Entities.BirthMonthEnum]]).Contains(x.BirthMonth)"""");
     }
 
     [Fact]

QueryKit/FilterParser.cs

@@ -1,8 +1,8 @@
 
 namespace QueryKit;
 
-using System.Collections;
 using System.Globalization;
+using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
 using Configuration;
@@ -314,6 +314,28 @@ private static Expression CreateRightExprFromType(Type leftExprType, string righ
                 return Expression.Constant(null, rawType);
             }
 
+            if (right.StartsWith("[") && right.EndsWith("]"))
+            {
+                var values = right.Trim('[', ']').Split(',').Select(x => x.Trim()).ToList();
+                var elementType = targetType.IsArray ? targetType.GetElementType() : targetType;
+            
+                var expressions = values.Select<string, Expression>(x =>
+                {
+                    if (elementType == typeof(string) && x.StartsWith("\"") && x.EndsWith("\""))
+                    {
+                        x = x.Trim('"');
+                    }
+            
+                    var enumValue = Enum.Parse(enumType, x);
+                    var constant = Expression.Constant(enumValue, enumType);
+
+                    return constant;
+                }).ToArray();
+            
+                var newArrayExpression = Expression.NewArrayInit(enumType, expressions);
+                return newArrayExpression;
+            }
+            
             var enumValue = Enum.Parse(enumType, right);
             var constant = Expression.Constant(enumValue, enumType);