feat: adds top level converter for railings

and fixes a different bug

Converters/Revit/Speckle.Converters.RevitShared/Speckle.Converters.RevitShared.projitems

@@ -89,6 +89,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)ToSpeckle\TopLevel\FootPrintRoofToSpeckleTopLevelConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ToSpeckle\TopLevel\HostedElementConversionToSpeckle.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ToSpeckle\TopLevel\ModelCurveToSpeckleTopLevelConverter.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)ToSpeckle\TopLevel\RailingTopLevelConverterToSpeckle.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ToSpeckle\TopLevel\RoofBaseToSpeckleTopLevelTopLevelConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ToSpeckle\TopLevel\RoomTopLevelConverterToSpeckle.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ToSpeckle\TopLevel\TopographyTopLevelConverterToSpeckle.cs" />

Converters/Revit/Speckle.Converters.RevitShared/ToSpeckle/TopLevel/ElementTopLevelConverterToSpeckle.cs

@@ -27,7 +27,7 @@ public override RevitElement Convert(DB.Element target)
       ? symbol.FamilyName
       : "no family";
     string category = target.Category?.Name ?? "no category";
-    List<Speckle.Objects.Geometry.Mesh> displayValue = _displayValueExtractor.GetDisplayValue(target);
+    List<Objects.Geometry.Mesh> displayValue = _displayValueExtractor.GetDisplayValue(target);
 
     RevitElement speckleElement =
       new()

Converters/Revit/Speckle.Converters.RevitShared/ToSpeckle/TopLevel/RailingTopLevelConverterToSpeckle.cs

@@ -0,0 +1,49 @@
+using Speckle.Converters.Common;
+using Speckle.Converters.RevitShared.Helpers;
+using Speckle.Converters.RevitShared.Settings;
+using Speckle.Converters.RevitShared.ToSpeckle;
+
+namespace Speckle.Converters.Revit2023.ToSpeckle.TopLevel;
+
+[NameAndRankValue(nameof(DBA.Railing), NameAndRankValueAttribute.SPECKLE_DEFAULT_RANK)]
+public class RailingTopLevelConverterToSpeckle : BaseTopLevelConverterToSpeckle<DBA.Railing, SOBR.RevitElement>
+{
+  private readonly DisplayValueExtractor _displayValueExtractor;
+  private readonly IConverterSettingsStore<RevitConversionSettings> _converterSettings;
+
+  public RailingTopLevelConverterToSpeckle(
+    DisplayValueExtractor displayValueExtractor,
+    IConverterSettingsStore<RevitConversionSettings> converterSettings
+  )
+  {
+    _displayValueExtractor = displayValueExtractor;
+    _converterSettings = converterSettings;
+  }
+
+  public override SOBR.RevitElement Convert(DBA.Railing target)
+  {
+    string family = target.Document.GetElement(target.GetTypeId()) is DB.FamilySymbol symbol
+      ? symbol.FamilyName
+      : "no family";
+    string category = target.Category?.Name ?? "no category";
+    var displayValue = _displayValueExtractor.GetDisplayValue(target);
+
+    var topRail = _converterSettings.Current.Document.GetElement(target.TopRail);
+    var topRailDisplayValue = _displayValueExtractor.GetDisplayValue(topRail);
+
+    displayValue.AddRange(topRailDisplayValue);
+
+    SOBR.RevitElement speckleElement =
+      new()
+      {
+        type = target.Name,
+        category = category,
+        family = family,
+        displayValue = displayValue
+      };
+
+    speckleElement["units"] = _converterSettings.Current.SpeckleUnits;
+
+    return speckleElement;
+  }
+}