fix some UI bugs

zero.Core/Entities/ListQuery.cs

@@ -2,6 +2,7 @@
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Linq.Expressions;
 
 namespace zero.Core.Entities
@@ -24,6 +25,8 @@ namespace zero.Core.Entities
 
     public bool OrderIsDescending { get; set; } = true;
 
+    public Func<IQueryable<T>, IQueryable<T>> OrderQuery = null;
+
     public int Page { get; set; } = 1;
 
     public int PageSize { get; set; } = 30;

zero.Core/Entities/PreviewModel.cs

@@ -0,0 +1,15 @@
+namespace zero.Core.Entities
+{
+  public class PreviewModel
+  {
+    public string Id { get; set; }
+
+    public string Icon { get; set; }
+
+    public string Text { get; set; }
+
+    public string Name { get; set; }
+
+    public bool HasError { get; set; }
+  }
+}

zero.Core/Entities/SelectModel.cs

@@ -0,0 +1,9 @@
+namespace zero.Core.Entities
+{
+  public class SelectModel
+  {
+    public string Id { get; set; }
+
+    public string Name { get; set; }
+  }
+}

zero.Core/Extensions/RavenQueryableExtensions.cs

@@ -80,7 +80,11 @@ namespace zero.Core.Extensions
           }
         }
 
-        if (!query.OrderBy.IsNullOrEmpty())
+        if (query.OrderQuery != null)
+        {
+          rawQuery = query.OrderQuery(rawQuery);
+        }
+        else if (!query.OrderBy.IsNullOrEmpty())
         {
           rawQuery = rawQuery.OrderBy(query.OrderBy, query.OrderIsDescending, query.OrderType == ListQueryOrderType.String ? OrderingType.String : OrderingType.Double);
         }