diff --git a/advlabdb/adminModelViews.py b/advlabdb/adminModelViews.py
index ad11c87..723dd4a 100644
--- a/advlabdb/adminModelViews.py
+++ b/advlabdb/adminModelViews.py
@@ -118,7 +118,7 @@ class UserView(SecureAdminModelView):
             if model == current_user and not form.active.data:
                 raise ModelViewException("Tried to deactiavte yourself as user!")
 
-            if form.generate_new_password.data:
+            if hasattr(form, "generate_new_password") and form.generate_new_password.data:
                 password = randomPassword()
 
                 UserView.flashPassword(password)
@@ -248,7 +248,7 @@ class StudentView(SecureAdminModelView):
 
 
 def partQueryFactory():
-    return Part.query.filter(Part.id.in_([part.id for part in userActiveSemester().parts]))
+    return Part.query.filter(Part.semester == userActiveSemester())
 
 
 def groupQueryFactory():
@@ -294,7 +294,7 @@ class PartStudentView(SecureAdminModelView):
     column_filters = ["part", "student", "group"]
 
     def queryFilter(self):
-        return PartStudent.part_id.in_([part.id for part in userActiveSemester().parts])
+        return PartStudent.part.has(Part.semester == userActiveSemester())
 
     def create_form(self, obj=None):
         form = self.CreateForm
@@ -311,7 +311,7 @@ class PartStudentView(SecureAdminModelView):
 
 
 def partStudentQueryFactory():
-    return PartStudent.query.filter(PartStudent.part_id.in_([part.id for part in userActiveSemester().parts]))
+    return PartStudent.query.filter(PartStudent.part.has(Part.semester == userActiveSemester()))
 
 
 class GroupView(SecureAdminModelView):
@@ -389,7 +389,7 @@ class ExperimentView(SecureAdminModelView):
 
 
 def assistantQueryFactory():
-    return Assistant.query.filter(Assistant.user_id.in_([user.id for user in User.query.filter(User.active == True)]))
+    return Assistant.query.filter(Assistant.user.has(User.active == True))
 
 
 class SemesterExperimentView(SecureAdminModelView):
@@ -503,9 +503,7 @@ class GroupExperimentView(SecureAdminModelView):
     column_filters = ["group", "semester_experiment.experiment", "appointments"]
 
     def queryFilter(self):
-        return GroupExperiment.group_id.in_(
-            [group.id for group in Group.query.filter(Group.semester == userActiveSemester())]
-        )
+        return GroupExperiment.group.has(Group.semester == userActiveSemester())
 
     def customCreateModel(self, form):
         return GroupExperiment.customInit(semester_experiment=form.semester_experiment.data, group=form.group.data)
@@ -530,14 +528,7 @@ class GroupExperimentView(SecureAdminModelView):
 
 def groupExperimentQueryFactory():
     return GroupExperiment.query.filter(
-        GroupExperiment.semester_experiment_id.in_(
-            [
-                semesterExperiment.id
-                for semesterExperiment in SemesterExperiment.query.filter(
-                    SemesterExperiment.semester == userActiveSemester()
-                )
-            ]
-        )
+        GroupExperiment.semester_experiment.has(SemesterExperiment.semester == userActiveSemester())
     )
 
 
@@ -570,8 +561,8 @@ class AppointmentView(SecureAdminModelView):
     ]
 
     def queryFilter(self):
-        return Appointment.group_experiment_id.in_(
-            groupExperiment.id for groupExperiment in groupExperimentQueryFactory()
+        return Appointment.group_experiment.has(
+            GroupExperiment.semester_experiment.has(SemesterExperiment.semester == userActiveSemester())
         )
 
     def customCreateModel(self, form):
@@ -641,8 +632,8 @@ class ExperimentMarkView(SecureAdminModelView):
     ]
 
     def queryFilter(self=None):
-        return ExperimentMark.group_experiment_id.in_(
-            groupExperiment.id for groupExperiment in groupExperimentQueryFactory()
+        return ExperimentMark.group_experiment.has(
+            GroupExperiment.semester_experiment.has(SemesterExperiment.semester == userActiveSemester())
         )
 
     def checkForm(form):
diff --git a/advlabdb/assistantModelViews.py b/advlabdb/assistantModelViews.py
index b056e40..d9b941b 100644
--- a/advlabdb/assistantModelViews.py
+++ b/advlabdb/assistantModelViews.py
@@ -32,18 +32,11 @@ class AssistantGroupExperimentView(SecureAssistantModelView):
     column_filters = ["group", "semester_experiment.experiment", "appointments"]
 
     def queryFilter1(self):
-        return GroupExperiment.group_id.in_(
-            [group.id for group in Group.query.filter(Group.semester == userActiveSemester())]
-        )
+        return GroupExperiment.group.has(Group.semester == userActiveSemester())
 
     def queryFilter2(self):
-        return GroupExperiment.semester_experiment_id.in_(
-            [
-                semesterExperiment.id
-                for semesterExperiment in SemesterExperiment.query.filter(
-                    SemesterExperiment.assistants.any(Assistant.id == current_user.assistant.id)
-                )
-            ]
+        return GroupExperiment.semester_experiment.has(
+            SemesterExperiment.assistants.any(Assistant.user == current_user)
         )
 
     def get_query(self):