From cc04270c2a6017830a1efccdfa9b30f9d2f53835 Mon Sep 17 00:00:00 2001
From: biss <bishsh2006@outlook.com>
Date: Sat, 8 Aug 2026 15:37:34 +0800
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---
 .../Controllers/ExperimentsController.cs      |  2 +-
 tests/Jiaowu.Api.Tests/MySqlMigrationTests.cs | 33 +++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/Jiaowu.Api/Controllers/ExperimentsController.cs b/src/Jiaowu.Api/Controllers/ExperimentsController.cs
index dd54afd..b47f5b4 100644
--- a/src/Jiaowu.Api/Controllers/ExperimentsController.cs
+++ b/src/Jiaowu.Api/Controllers/ExperimentsController.cs
@@ -574,7 +574,7 @@ public sealed class ExperimentsController(
                 var projects = await ScopedProjects()
                     .Include(x => x.TeachingTask)
                     .ThenInclude(x => x!.AcademicTerm)
-                    .Where(x => projectIds.Contains(x.Id))
+                    .WhereIn(projectIds, x => x.Id)
                     .ToDictionaryAsync(x => x.Id, cancellationToken);
                 if (projects.Count != projectIds.Count)
                     return ValidationProblem(
diff --git a/tests/Jiaowu.Api.Tests/MySqlMigrationTests.cs b/tests/Jiaowu.Api.Tests/MySqlMigrationTests.cs
index e1cf942..724dfeb 100644
--- a/tests/Jiaowu.Api.Tests/MySqlMigrationTests.cs
+++ b/tests/Jiaowu.Api.Tests/MySqlMigrationTests.cs
@@ -235,6 +235,39 @@ public sealed class MySqlMigrationTests
             StringComparison.OrdinalIgnoreCase);
     }
 
+    [Fact]
+    public void MySql_experiment_batch_project_query_is_translatable()
+    {
+        using var db = new AppDbContext(CreateMySqlOptions());
+        var projectIds = new[]
+        {
+            Guid.Parse("11111111-1111-1111-1111-111111111111"),
+            Guid.Parse("22222222-2222-2222-2222-222222222222")
+        };
+        var accessibleTaskIds = db.TeachingTasks.Select(x => x.Id);
+
+        var sql = db.ExperimentProjects
+            .Where(x => accessibleTaskIds.Contains(x.TeachingTaskId))
+            .Include(x => x.TeachingTask)
+            .ThenInclude(x => x!.AcademicTerm)
+            .WhereIn(projectIds, x => x.Id)
+            .ToQueryString();
+
+        Assert.Contains(
+            "ExperimentProjects",
+            sql,
+            StringComparison.OrdinalIgnoreCase);
+        Assert.Contains(" IN (", sql, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains(
+            projectIds[0].ToString(),
+            sql,
+            StringComparison.OrdinalIgnoreCase);
+        Assert.Contains(
+            projectIds[1].ToString(),
+            sql,
+            StringComparison.OrdinalIgnoreCase);
+    }
+
     [Fact]
     public void MySql_index_names_fit_the_server_identifier_limit()
     {