Populate letter grades for 3T2022 (#1754)

courses/migrations/0038_populate_letter_grades_3T2022.py

@@ -0,0 +1,49 @@
+# Generated by Django 3.2.18 on 2023-07-17 12:19
+from django.db import migrations
+
+
+def convert_to_letter(grade):
+    """Convert a decimal number to letter grade"""
+    if grade >= 0.825:
+        return "A"
+    elif grade >= 0.65:
+        return "B"
+    elif grade >= 0.55:
+        return "C"
+    elif grade >= 0.50:
+        return "D"
+    else:
+        return "F"
+
+
+def populate_letter_grade(apps, schema_editor):
+    """Populate letter grades for DEDP courses for 3T2022 semester"""
+    CourseRunGrade = apps.get_model("courses", "CourseRunGrade")
+    course_run_ids = [
+        "course-v1:MITxT+14.100x+3T2022",
+        "course-v1:MITxT+14.750x+3T2022",
+        "course-v1:MITxT+JPAL102x+3T2022",
+        "course-v1:MITxT+14.73x+3T2022",
+        "course-v1:MITxT+14.310x+3T2022",
+    ]
+
+    grades = CourseRunGrade.objects.filter(
+        passed=True,
+        letter_grade__contains="Pass",
+        course_run__courseware_id__in=course_run_ids,
+    )
+    for grade in grades:
+        grade.letter_grade = convert_to_letter(grade.grade)
+        grade.set_by_admin = True
+        grade.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("courses", "0037_update_programrequirements_add_elective_flag"),
+    ]
+
+    operations = [
+        migrations.RunPython(populate_letter_grade, migrations.RunPython.noop),
+    ]