Fix FlurlParsingException when retrieving fills.

HISTORY.md

@@ -1,3 +1,6 @@
+## v2.0.6
+* Issue 8: Fixed JSON deseralization error with `client.Fills.GetFillsByProductIdAsync` where `usd_volume` could be null.
+
 ## v2.0.5
 * Issue 7: Fixed JSON deserialization error with `client.MarketData.GetProductsAsync` when using sandbox.
 

Source/Coinbase.Pro/Models/Objects.cs

@@ -602,7 +602,7 @@ public partial class Fill : Json
       public bool Settled { get; set; }
 
       [JsonProperty("usd_volume")]
-      public decimal UsdVolume { get; set; }
+      public decimal? UsdVolume { get; set; }
    }
 
    /// <summary>

Source/Coinbase.Tests/GitHubIssues/Issue8.cs

@@ -0,0 +1,56 @@
+using System.Threading.Tasks;
+using Coinbase.Pro;
+using Coinbase.Tests.EndpointTests;
+using FluentAssertions;
+using NUnit.Framework;
+
+namespace Coinbase.Tests.GitHubIssues
+{
+   public class Issue8 : Test
+   {
+      public const string Json = @"[
+{
+      ""created_at"":""2017-09-27T22:57:14.483Z"",
+      ""trade_id"":1111,
+      ""product_id"":""ETH-BTC"",
+      ""order_id"":""2F4F7C76-644E-4DCF-A7E1-5BEB57502E76"",
+      ""user_id"":""CE3FABAC-CA62-45C2-8AAF-DB59FE353C90"",
+      ""profile_id"":""C1B3739F-2301-4821-86B4-15463C7C353B"",
+      ""liquidity"":""M"",
+      ""price"":""0.08000"",
+      ""size"":""0.9"",
+      ""fee"":""0.0000000000000000"",
+      ""side"":""sell"",
+      ""settled"":true,
+      ""usd_volume"":null
+   },
+   {
+      ""created_at"":""2017-09-27T22:54:22.405Z"",
+      ""trade_id"":2222,
+      ""product_id"":""ETH-BTC"",
+      ""order_id"":""58F5D697-66C4-428D-82A0-CEDFB881F8DA"",
+      ""user_id"":""4476C87B-E489-44EC-9822-B8E2522FD17E"",
+      ""profile_id"":""FEBC6314-2721-4C40-9EE6-CF5FAE135F9E"",
+      ""liquidity"":""T"",
+      ""price"":""0.80"",
+      ""size"":""0.09"",
+      ""fee"":""0.02"",
+      ""side"":""sell"",
+      ""settled"":true,
+      ""usd_volume"":null
+   }
+]";
+
+      [Test]
+      public async Task can_deser_null_usdvolume()
+      {
+         var client = new CoinbaseProClient();
+
+         server.RespondWithPagedResult(Json, 11, 33);
+
+         var f = await client.Fills.GetFillsByProductIdAsync("ETH-BTC");
+
+         f.Data.Count.Should().Be(2);
+      }
+   }
+}