From 21ac096d007f6cba48d69319ec0a6fb22e4dfd0e Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Sat, 21 Jun 2025 10:25:11 +0800
Subject: [PATCH] Update mongodb

---
 .../MongoDbTest/UnitTest/QuerySelect.cs       | 11 ++++--
 .../VisitorItems/FieldPathExtractor.cs        | 36 ++++++++++++++++---
 2 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs
index 826939590..bd13a045f 100644
--- a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs
+++ b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs
@@ -159,11 +159,18 @@ namespace MongoDbTest
             var list17 = db.Queryable<Student>()  
                 .Where(it=>SqlFunc.Length(it.Name)>1)
                .Select(it => new
-               {
+               { 
                    name2=it.Name,
-                   name = it.Name.Substring(0,1), 
+                   name = it.Name.Substring(0,1),  
                }).ToList();
             if(list17.First().name2!="a2"||list17.First().name.Substring(0,1)!= list17.First().name) Cases.ThrowUnitError();
+
+            var list18 = db.Queryable<Student>() 
+             .Select(it => new
+             { 
+                 name = it.Name.Length,
+             }).ToList();
+            if(list18.Max(it=>it.name)!=2) Cases.ThrowUnitError(); 
         }
         [SqlSugar.SugarTable("UnitStudent1231sds3z1")]
         public class Student : MongoDbBase
diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/FieldPathExtractor.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/FieldPathExtractor.cs
index f2cda48af..c8985fbb8 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/FieldPathExtractor.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/FieldPathExtractor.cs
@@ -36,14 +36,22 @@ namespace SqlSugar.MongoDb
             if (ExpressionTool.GetParameters(expr).Count == 0)
             {
                 var value = ExpressionTool.GetMemberValue(oldMember.Member, oldExp);
-                return  UtilMethods.MyCreate(value);
+                return UtilMethods.MyCreate(value);
             }
-            else if (!string.IsNullOrEmpty(BinaryExpressionTranslator.GetSystemDateMemberName(expr)))
+            else if (IsLength(oldMember))
             {
-               var memberExp= (expr as MemberExpression);
+                var memberExp = (expr as MemberExpression);
                 var method = new MongoDbMethod() { context = _context };
                 var model = new MethodCallExpressionModel() { Args = new List<MethodCallExpressionArgs>() };
-                if (memberExp.Member.Name == "Date") 
+                model.Args.Add(new MethodCallExpressionArgs() { MemberValue = memberExp.Expression });
+                return BsonDocument.Parse(method.Length(model));
+            }
+            else if (IsDateProperty(expr))
+            {
+                var memberExp = (expr as MemberExpression);
+                var method = new MongoDbMethod() { context = _context };
+                var model = new MethodCallExpressionModel() { Args = new List<MethodCallExpressionArgs>() };
+                if (memberExp.Member.Name == "Date")
                 {
                     model.Args.Add(new MethodCallExpressionArgs() { MemberValue = memberExp.Expression });
                     return BsonDocument.Parse(method.ToDateShort(model));
@@ -58,6 +66,26 @@ namespace SqlSugar.MongoDb
             return ExtractFieldPath(expr);
         }
 
+        private static bool IsDateProperty(Expression expr)
+        {
+            return !string.IsNullOrEmpty(BinaryExpressionTranslator.GetSystemDateMemberName(expr));
+        }
+
+        private static bool IsLength(MemberExpression oldMember)
+        {
+            if (oldMember.Member.Name != "Length")
+                return false;
+
+            var expressionType = oldMember.Expression?.Type;
+            if (expressionType == null)
+                return false;
+
+            return expressionType.IsArray
+                || expressionType == typeof(string)
+                || expressionType.FullName == "System.Span`1"
+                || expressionType.FullName == "System.ReadOnlySpan`1";
+        }
+
         private BsonValue ExtractFieldPath(Expression expr)
         {
             var parts = new Stack<string>();