dont include Merge props in the json

InertiaCore/Models/Page.cs

@@ -1,3 +1,5 @@
+using System.Text.Json.Serialization;
+
 namespace InertiaCore.Models;
 
 internal class Page
@@ -6,5 +8,7 @@ internal class Page
     public string Component { get; set; } = default!;
     public string? Version { get; set; }
     public string Url { get; set; } = default!;
+
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public List<string>? MergeProps { get; set; }
 }

InertiaCore/Response.cs

@@ -185,6 +185,11 @@ public Response WithViewData(IDictionary<string, object> viewData)
             .Where(resolvedProps.Contains) // Filter only the props that are in the resolved props
             .ToList();
 
+        if (mergeProps.Count == 0)
+        {
+            return null;
+        }
+
         // Return the result
         return mergeProps;
     }

InertiaCoreTests/UnitTestMergeData.cs

@@ -177,7 +177,7 @@ public void TestMergeAsyncPartialDataOmitted()
             { "errors", new Dictionary<string, string>(0) }
         }));
 
-        Assert.That(page?.MergeProps, Is.EqualTo(new List<string> { }));
+        Assert.That(page?.MergeProps, Is.EqualTo(null));
     }
 
     public void TestNoMergeProps()
@@ -201,6 +201,7 @@ public void TestNoMergeProps()
             { "testFunc", "Func" },
             { "errors", new Dictionary<string, string>(0) }
         }));
-        Assert.That(page?.MergeProps, Is.EqualTo(new List<string> { }));
+        Assert.That(page?.MergeProps, Is.EqualTo(null));
     }
+
 }

InertiaCoreTests/UnitTestResult.cs

@@ -1,6 +1,7 @@
 using InertiaCore.Models;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
+using System.Text.Json;
 
 namespace InertiaCoreTests;
 
@@ -40,6 +41,62 @@ public void TestJsonResult()
                 { "test", "Test" },
                 { "errors", new Dictionary<string, string>(0) }
             }));
+
+            // Check the serialized JSON
+            var jsonString = JsonSerializer.Serialize(json);
+            var dictionary = JsonSerializer.Deserialize<Dictionary<string, object?>>(jsonString);
+
+            Assert.That(dictionary, Is.Not.Null);
+            Assert.That(dictionary!.ContainsKey("MergeProps"), Is.False);
+        });
+    }
+    [
+        Test]
+    [Description("Test if the JSON result with merged data is created correctly.")]
+    public void TestJsonMergedResult()
+    {
+        var response = _factory.Render("Test/Page", new
+        {
+            Test = "Test",
+            TestMerged = _factory.Merge(() => "Merged")
+        });
+
+        var headers = new HeaderDictionary
+        {
+            { "X-Inertia", "true" }
+        };
+
+        var context = PrepareContext(headers);
+
+        response.SetContext(context);
+        response.ProcessResponse();
+
+        var result = response.GetResult();
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(result, Is.InstanceOf(typeof(JsonResult)));
+
+            var json = (result as JsonResult)?.Value;
+            Assert.That(json, Is.InstanceOf(typeof(Page)));
+
+            Assert.That((json as Page)?.Component, Is.EqualTo("Test/Page"));
+            Assert.That((json as Page)?.Props, Is.EqualTo(new Dictionary<string, object?>
+            {
+                { "test", "Test" },
+                { "testMerged", "Merged" },
+                { "errors", new Dictionary<string, string>(0) }
+            }));
+            Assert.That((json as Page)?.MergeProps, Is.EqualTo(new List<string> {
+                "testMerged"
+            }));
+
+            // Check the serialized JSON
+            var jsonString = JsonSerializer.Serialize(json);
+            var dictionary = JsonSerializer.Deserialize<Dictionary<string, object?>>(jsonString);
+
+            Assert.That(dictionary, Is.Not.Null);
+            Assert.That(dictionary!.ContainsKey("MergeProps"), Is.True);
         });
     }