Fix reference fields.

backend/src/Squidex.Domain.Apps.Core.Model/Schemas/SchemaExtensions.cs

@@ -62,18 +62,18 @@ public static class SchemaExtensions
         return schema.RootFields(schema.FieldsInReferences);
     }
 
-    public static IEnumerable<RootField> ListFields(this Schema schema)
-    {
-        return schema.RootFields(schema.FieldsInLists);
-    }
-
     public static IEnumerable<RootField> RootFields(this Schema schema, FieldNames names)
     {
         var hasField = false;
 
         foreach (var name in names)
         {
-            if (schema.FieldsByName.TryGetValue(name, out var field))
+            if (!FieldNames.IsDataField(name, out var dataField))
+            {
+                continue;
+            }
+
+            if (schema.FieldsByName.TryGetValue(dataField, out var field))
             {
                 hasField = true;
 

backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Schemas/SchemaTests.cs

@@ -480,6 +480,36 @@ public class SchemaTests
         deserialized.Should().BeEquivalentTo(original);
     }
 
+    [Fact]
+    public void Should_get_reference_fields()
+    {
+        var field1 = CreateField(1);
+        var field2 = CreateField(2);
+
+        var schema_1 = schema_0.AddField(field1);
+        var schema_2 = schema_1.AddField(field2);
+        var schema_3 = schema_2.SetFieldsInReferences(FieldNames.Create($"data.{field1.Name}", $"data.{field2.Name}"));
+
+        var referenceFields = schema_3.ReferenceFields();
+
+        Assert.Equal(new RootField[] { field1, field2 }, referenceFields.ToArray());
+    }
+
+    [Fact]
+    public void Should_get_reference_fields_with_fallback()
+    {
+        var field1 = CreateField(1);
+        var field2 = CreateField(2);
+
+        var schema_1 = schema_0.AddField(field1);
+        var schema_2 = schema_1.AddField(field2);
+        var schema_3 = schema_2.SetFieldsInReferences(FieldNames.Create("data.invalid"));
+
+        var referenceFields = schema_3.ReferenceFields();
+
+        Assert.Equal(new RootField[] { field1 }, referenceFields.ToArray());
+    }
+
     [Fact]
     public void Should_deserialize_state()
     {