Add serialization for parameter arrays

src/Enjin.Platform.Sdk/Enjin.Platform.Sdk.Tests/Unit/Json/GraphQlParameterJsonConverterTest.cs

@@ -1,4 +1,5 @@
-using System.Text.Json;
+using System.Numerics;
+using System.Text.Json;
 using Moq;
 using NUnit.Framework;
 
@@ -53,4 +54,33 @@ public void SerializeGivenGraphQlParameterReturnsExpectedJson()
         // Verify
         MockParameter.Verify();
     }
+
+    [Test]
+    public void SerializeGivenListGraphQlParameterReturnsExpectedJson()
+    {
+        // Arrange - Data
+        const string expected = @"{""key"":[{""param1"":1},{""param2"":true}]}";
+        var parameter1 = new TestGraphQlParameter();
+        parameter1.Set("param1", new BigInteger(1));
+        var parameter2 = new TestGraphQlParameter();
+        parameter2.Set("param2", true);
+        Dictionary<string, object?> parameters = new()
+        {
+            { "key", new List<IGraphQlParameter> {parameter1, parameter2} },
+        };
+
+        // Arrange - Stubbing
+        MockParameter.Setup(mock => mock.Parameters)
+                     .Returns(parameters)
+                     .Verifiable($"Verify call to {nameof(MockParameter.Object.Parameters)} on ${nameof(MockParameter)}");
+
+        // Act
+        string actual = JsonSerializer.Serialize(MockParameter.Object, Options);
+
+        // Assert
+        Assert.That(actual, Is.EqualTo(expected));
+
+        // Verify
+        MockParameter.Verify();
+    }
 }

src/Enjin.Platform.Sdk/Enjin.Platform.Sdk.Tests/Unit/TestGraphQlParameter.cs

@@ -0,0 +1,9 @@
+namespace Enjin.Platform.Sdk.Tests;
+
+public sealed class TestGraphQlParameter : GraphQlParameter<TestGraphQlParameter>
+{
+    public TestGraphQlParameter Set<T>(string name, T? amount)
+    {
+        return SetParameter(name, amount);
+    }
+}

src/Enjin.Platform.Sdk/Enjin.Platform.Sdk/Json/GraphQlParameterJsonConverter.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
+using System.Numerics;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using JetBrains.Annotations;
@@ -29,11 +31,34 @@ public override TValue Read(ref Utf8JsonReader reader, Type typeToConvert, JsonS
     public override void Write(Utf8JsonWriter writer, TValue value, JsonSerializerOptions options)
     {
         writer.WriteStartObject();
-
-        foreach (KeyValuePair<string, object?> variable in value.Parameters)
+        foreach (var variable in value.Parameters)
         {
-            writer.WritePropertyName(variable.Key);
-            writer.WriteRawValue(JsonSerializer.Serialize(variable.Value, options));
+            if (variable.Value is List<IGraphQlParameter> array)
+            {
+                writer.WritePropertyName(variable.Key);
+                writer.WriteStartArray();
+                foreach (var item in array)
+                {
+                    writer.WriteStartObject();
+                    foreach (var parameter in item.Parameters)
+                    {
+                        writer.WritePropertyName(parameter.Key);
+                        if (parameter.Value is BigInteger val)
+                            writer.WriteRawValue(val.ToString(CultureInfo.InvariantCulture));
+                        else 
+                            writer.WriteRawValue(JsonSerializer.Serialize(parameter.Value, options));
+                    }
+
+                    writer.WriteEndObject();
+                }
+
+                writer.WriteEndArray();
+            }
+            else
+            {
+                writer.WritePropertyName(variable.Key);
+                writer.WriteRawValue(JsonSerializer.Serialize(variable.Value, options));
+            }
         }
 
         writer.WriteEndObject();