fix(model): register ListRecord.Field adapter in GsonFactory

slack-api-client/src/main/java/com/slack/api/util/json/GsonFactory.java

@@ -16,6 +16,7 @@
 import com.slack.api.model.block.element.RichTextElement;
 import com.slack.api.model.event.FunctionExecutedEvent;
 import com.slack.api.model.event.MessageChangedEvent;
+import com.slack.api.model.list.ListRecord;
 import com.slack.api.model.list.ListView;
 
 import java.time.Instant;
@@ -87,6 +88,7 @@ public static void registerTypeAdapters(GsonBuilder builder, boolean failOnUnkno
                 .registerTypeAdapter(AppWorkflow.StepInputValueElementDefault.class, new GsonAppWorkflowStepInputValueDefaultFactory(failOnUnknownProps))
                 .registerTypeAdapter(LogsResponse.DetailsChangedValue.class, new GsonAuditLogsDetailsChangedValueFactory(failOnUnknownProps))
                 .registerTypeAdapter(LogsResponse.UserIDs.class, new GsonAuditLogsDetailsUserIDsFactory(failOnUnknownProps))
-                .registerTypeAdapter(ListView.Grouping.class, new GsonListViewGroupingFactory(failOnUnknownProps));
+                .registerTypeAdapter(ListView.Grouping.class, new GsonListViewGroupingFactory(failOnUnknownProps))
+                .registerTypeAdapter(ListRecord.Field.class, new GsonListRecordFieldFactory(failOnUnknownProps));
     }
 }

slack-api-client/src/test/java/test_locally/api/util/json/GsonListRecordFieldFactoryTest.java

@@ -0,0 +1,72 @@
+package test_locally.api.util.json;
+
+import com.google.gson.Gson;
+import com.slack.api.methods.response.conversations.ConversationsRepliesResponse;
+import com.slack.api.model.list.ListRecord;
+import com.slack.api.util.json.GsonFactory;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+public class GsonListRecordFieldFactoryTest {
+
+    private final Gson gson = GsonFactory.createSnakeCase();
+
+    private static String repliesWithListRecordFieldMessage(String messageJson) {
+        return "{\n" +
+                "  \"ok\": true,\n" +
+                "  \"messages\": [\n" +
+                "    {\n" +
+                "      \"type\": \"message\",\n" +
+                "      \"subtype\": \"bot_message\",\n" +
+                "      \"ts\": \"1700000001.000200\",\n" +
+                "      \"text\": \"Request has been marked Completed.\",\n" +
+                "      \"attachments\": [\n" +
+                "        {\n" +
+                "          \"id\": 1,\n" +
+                "          \"list_record\": {\n" +
+                "            \"record\": {\n" +
+                "              \"fields\": [\n" +
+                "                {\n" +
+                "                  \"key\": \"Col1\",\n" +
+                "                  \"column_id\": \"Col1\",\n" +
+                "                  \"value\": \"https://example.com\",\n" +
+                "                  \"message\": " + messageJson + "\n" +
+                "                }\n" +
+                "              ]\n" +
+                "            }\n" +
+                "          }\n" +
+                "        }\n" +
+                "      ]\n" +
+                "    }\n" +
+                "  ]\n" +
+                "}";
+    }
+
+    private ListRecord.Field firstField(String json) {
+        ConversationsRepliesResponse response = gson.fromJson(json, ConversationsRepliesResponse.class);
+        return response.getMessages().get(0).getAttachments().get(0)
+                .getListRecord().getRecord().getFields().get(0);
+    }
+
+    @Test
+    public void conversationsReplies_messageAsArray() {
+        ListRecord.Field field = firstField(repliesWithListRecordFieldMessage(
+                "[{\"value\": \"https://example.com\", \"channel_id\": \"C111\", \"ts\": \"1700000000.000100\"}," +
+                        " {\"value\": \"https://example.com/2\", \"channel_id\": \"C111\", \"ts\": \"1700000000.000300\"}]"));
+
+        assertThat(field.getMessages().size(), is(2));
+        assertThat(field.getMessages().get(1).getTs(), is("1700000000.000300"));
+        assertThat(field.getMessage().getTs(), is("1700000000.000100"));
+    }
+
+    @Test
+    public void conversationsReplies_messageAsObject() {
+        ListRecord.Field field = firstField(repliesWithListRecordFieldMessage(
+                "{\"text\": \"hello\", \"ts\": \"1700000000.000100\"}"));
+
+        assertThat(field.getMessage().getText(), is("hello"));
+        assertThat(field.getMessages().size(), is(1));
+    }
+}