update

app/Models/CourseSign.php

@@ -358,7 +358,7 @@ class CourseSign extends SoftDeletesModel
     {
         $courseSignsQuery = self::getStudentList($start_date, $end_date, 1, $course_ids);
         $courseSigns = $courseSignsQuery->whereHas('course', function ($query) {
-            $query->where('typeDetail', function ($q) {
+            $query->whereHas('typeDetail', function ($q) {
                 $q->where('name', '人才培训');
             });
         })->get();