Fix NGSS restrictions, filter out permission-required courses from PC…

…A stats

backend/courses/models.py

@@ -494,17 +494,6 @@ class NGSSRestriction(models.Model):
         )
     )
 
-    courses = models.ManyToManyField(
-        Course,
-        related_name="ngss_restrictions",
-        blank=True,
-        help_text=dedent(
-            """
-            Individual Course objects which have this restriction.
-            """
-        ),
-    )
-
     def __str__(self):
         return f"{self.code} - {self.restriction_type} - {self.description}"
 
@@ -683,6 +672,15 @@ class Meta:
         """
         ),
     )
+    ngss_restrictions = models.ManyToManyField(
+        NGSSRestriction,
+        related_name="sections",
+        blank=True,
+        help_text=(
+            "All NGSS registration Restriction objects to which this section is subject. "
+            "This field will be empty for sections in 2022B or later."
+        ),
+    )
     pre_ngss_restrictions = models.ManyToManyField(
         PreNGSSRestriction,
         related_name="sections",

backend/review/views.py

@@ -8,7 +8,14 @@
 from rest_framework.permissions import IsAuthenticated
 from rest_framework.response import Response
 
-from courses.models import Course, Department, Instructor, PreNGSSRestriction, Section
+from courses.models import (
+    Course,
+    Department,
+    Instructor,
+    NGSSRestriction,
+    PreNGSSRestriction,
+    Section,
+)
 from courses.util import get_current_semester, get_or_create_add_drop_period
 from PennCourses.docs_settings import PcxAutoSchema
 from PennCourses.settings.base import (
@@ -63,13 +70,20 @@
     & Q(capacity__gt=0)
     & ~Q(course__semester__icontains="b")  # Filter out summer classes
     & Q(has_status_updates=True)
+    & ~Q(
+        id__in=Subquery(
+            NGSSRestriction.objects.filter(restriction_type="Special Approval").values(
+                "sections__id"
+            )
+        )
+    )  # Filter out sections that require permit for registration
     & ~Q(
         id__in=Subquery(
             PreNGSSRestriction.objects.filter(
                 code__in=PRE_NGSS_PERMIT_REQ_RESTRICTION_CODES
             ).values("sections__id")
         )
-    )  # Filter out sections that require permit for registration
+    )  # Filter out sections that require permit for registration (pre-NGSS)
     # TODO: get permit information from new OpenData API
 )