Populate passing DEDP grades that were set to None by Admin (#1787)

courses/migrations/0040_populate_none_letter_grades_for_DEDP.py

@@ -0,0 +1,50 @@
+# Generated by Django 3.2.18 on 2023-07-27 19:33
+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 that were set to None by admin"""
+    CourseRunGrade = apps.get_model("courses", "CourseRunGrade")
+    course_ids = [
+        "course-v1:MITxT+14.100x",
+        "course-v1:MITxT+14.750x",
+        "course-v1:MITxT+14.740x",
+        "course-v1:MITxT+JPAL102x",
+        "course-v1:MITxT+14.73x",
+        "course-v1:MITxT+14.310x",
+        "course-v1:MITxT+14.009x",
+    ]
+    grades = CourseRunGrade.objects.filter(
+        passed=True,
+        course_run__course__readable_id__in=course_ids,
+        letter_grade=None,
+        set_by_admin=True,
+    )
+    for grade in grades:
+        grade.letter_grade = convert_to_letter(grade.grade)
+        grade.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("courses", "0039_program_program_type"),
+    ]
+
+    operations = [
+        migrations.RunPython(populate_letter_grade, migrations.RunPython.noop),
+    ]