Queryable.Mapper()

Src/Asp.Net/SqlServerTest/Demos/G_Mapper.cs

@@ -6,7 +6,7 @@ using System.Text;
 
 namespace OrmTest.Demo
 {
-     public class  Mapper : DemoBase
+    public class Mapper : DemoBase
     {
         public static void Init()
         {
@@ -17,12 +17,37 @@ namespace OrmTest.Demo
                         .Select<ViewModelStudent3>().ToList();
 
 
-            var s12 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id)
-            .Select<ViewModelStudent3>().Mapper(it=> {
-                it.Name = it.Name==null?"默认值":it.Name;
-                it.CreateTime = DateTime.Now.Date;
-                it.Id = it.Id*1000;
-            }).ToList();
+            var s12 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id).Select<ViewModelStudent3>()
+
+                .Mapper((it, cache) =>
+                {
+
+                    var allSchools = cache.GetListByPrimaryKeys<School>(i => i.SchoolId);//in（ViewModelStudent3[0].id , ViewModelStudent3[1].id...）
+
+                    //Equal to the following writing.
+                    //var allSchools2= cache.Get(list =>
+                    // {
+                    //     var ids=list.Select(i => it.SchoolId).ToList(); 
+                    //     return db.Queryable<School>().In(ids).ToList();
+                    //});Complex writing metho
+
+
+
+                    it.School = allSchools.FirstOrDefault(i => i.Id == it.SchoolId);//one to one
+
+                    it.Schools = allSchools.Where(i => i.Id == it.SchoolId).ToList();//one to many
+
+                }).ToList();
+
+
+            var s13 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id).Select<ViewModelStudent3>()
+
+                   .Mapper((it, cache) =>
+                   {
+                       it.Schools = db.Queryable<School>().Where(i => i.Id == it.SchoolId).ToList();
+                   }).ToList();
+
+
         }
     }
 }

Src/Asp.Net/SqlServerTest/Models/ViewModelStudent.cs

@@ -20,5 +20,7 @@ namespace OrmTest.Models
          public string SchoolName { get; set; }
         public string School_Name { get; set; }
         public string ScId { get; set; }
+        public School School { get; set; }
+        public List<School> Schools { get; set; }
     }
 }