fix(*): enums to appear as strings in swagger schema

Author: ddidgdimitrov-infragistics

NorthwindCRUD/Filters/EnumSchemaFilter.cs

@@ -10,12 +10,11 @@ public void Apply(OpenApiSchema schema, SchemaFilterContext context)
         {
             if (context.Type.IsEnum)
             {
-                var enumValues = Enum.GetValues(context.Type)
-                    .Cast<object>()
-                    .Select(e => new OpenApiString(e.ToString()))
+                schema.Type = "string";
+                schema.Enum = context.Type
+                    .GetEnumNames()
+                    .Select(name => new OpenApiString(name))
                     .ToList<IOpenApiAny>();
-
-                schema.Enum = enumValues;
             }
         }
     }

NorthwindCRUD/Helpers/Enums.cs

@@ -14,6 +14,9 @@ public enum Shipping
 
             [EnumMember(Value = "AirCargo")]
             AirCargo,
+
+            [EnumMember(Value = "Mail")]
+            Mail,
         }
     }
 }