diff --git a/advlabdb/adminModelViews.py b/advlabdb/adminModelViews.py
index 75763fe..f245edf 100644
--- a/advlabdb/adminModelViews.py
+++ b/advlabdb/adminModelViews.py
@@ -404,8 +404,8 @@ class PartView(SecureAdminModelView):
 
     column_searchable_list = ["program.label", "number"]
 
-    def queryFilter(self):
-        return Part.semester == current_user.active_semester
+    def query_modifier(self, query):
+        return query.where(Part.semester == current_user.active_semester)
 
     def customCreateModel(self, form):
         return Part(program=form.program.data, number=form.number.data, semester=current_user.active_semester)
@@ -560,8 +560,8 @@ class PartStudentView(SecureAdminModelView):
         ),
     ]
 
-    def queryFilter(self):
-        return PartStudent.part.has(Part.semester == current_user.active_semester)
+    def query_modifier(self, query):
+        return query.join(Part).where(Part.semester == current_user.active_semester)
 
     def on_model_change(self, form, model, is_created):
         PartStudent.check(model.part, model.group)
@@ -627,8 +627,8 @@ class GroupView(SecureAdminModelView):
     )
     refreshFiltersCache = True
 
-    def queryFilter(self):
-        return Group.semester == current_user.active_semester
+    def query_modifier(self, query):
+        return query.wher(Group.semester == current_user.active_semester)
 
     def customCreateModel(self, form):
         return Group.customInit(form.part_students.data)
@@ -788,8 +788,8 @@ class SemesterExperimentView(SecureAdminModelView):
         ),
     ]
 
-    def queryFilter(self):
-        return SemesterExperiment.semester == current_user.active_semester
+    def query_modifier(self, query):
+        return query.where(SemesterExperiment.semester == current_user.active_semester)
 
     def customCreateModel(self, form):
         return SemesterExperiment(
@@ -1044,8 +1044,8 @@ class GroupExperimentView(SecureAdminModelView):
         ),
     ]
 
-    def queryFilter(self):
-        return GroupExperiment.group.has(Group.semester == current_user.active_semester)
+    def query_modifier(self, query):
+        return query.join(Group).where(Group.semester == current_user.active_semester)
 
     def customCreateModel(self, form):
         return GroupExperiment(semester_experiment=form.semester_experiment.data, group=form.group.data)
@@ -1164,9 +1164,11 @@ class AppointmentView(SecureAdminModelView):
         ),
     ]
 
-    def queryFilter(self):
-        return Appointment.group_experiment.has(
-            GroupExperiment.semester_experiment.has(SemesterExperiment.semester == current_user.active_semester)
+    def query_modifier(self, query):
+        return (
+            query.join(GroupExperiment)
+            .join(SemesterExperiment)
+            .where(SemesterExperiment.semester == current_user.active_semester)
         )
 
     def customCreateModel(self, form):
@@ -1340,9 +1342,11 @@ class ExperimentMarkView(SecureAdminModelView):
 
     """
     # Deactivated for the experiments history of a student.
-    def queryFilter(self):
-        return ExperimentMark.group_experiment.has(
-            GroupExperiment.semester_experiment.has(SemesterExperiment.semester == current_user.active_semester)
+    def query_modifier(self, query):
+        return (
+            query.join(GroupExperiment)
+            .join(SemesterExperiment)
+            .where(SemesterExperiment.semester == current_user.active_semester)
         )
     """