Migrate existing (string) values to populate min_weeks and max_weeks (#2481)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: annagav

cms/migrations/0041_populate_min_weeks.py

@@ -0,0 +1,48 @@
+# Generated by Django 4.2.16 on 2024-12-03 18:25
+
+import re
+
+from django.db import migrations
+
+
+def populate_max_min_weeks_fields(apps, schema_editor):
+    CoursePage = apps.get_model("cms", "CoursePage")
+    for course_page in CoursePage.objects.all():
+        if course_page.length:
+            duration_nums = re.findall(r"\d+", course_page.length)
+            if len(duration_nums) > 0:
+                course_page.max_weeks = duration_nums[0]
+                course_page.min_weeks = duration_nums[0]
+                course_page.save()
+
+    ProgramPage = apps.get_model("cms", "ProgramPage")
+    for program_page in ProgramPage.objects.all():
+        if program_page.length and program_page.max_weeks is None:
+            duration_string = re.findall(
+                r"\d+[\s-]*[\d+\s]*week", program_page.length.lower()
+            )
+            if duration_string:
+                duration_nums = re.findall(r"\d+", duration_string[0])
+            else:
+                duration_string = re.findall(
+                    r"\d+[\s-]*[\d+\s]*month", program_page.length.lower()
+                )
+                duration_nums_in_month = re.findall(r"\d+", duration_string[0])
+                duration_nums = [num * 4 for num in duration_nums_in_month]
+            program_page.min_weeks = duration_nums[0]
+            program_page.max_weeks = (
+                duration_nums[1] if len(duration_nums) > 1 else duration_nums[0]
+            )
+            program_page.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("cms", "0040_coursepage_max_weeks_coursepage_min_weeks_and_more"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            populate_max_min_weeks_fields, reverse_code=migrations.RunPython.noop
+        ),
+    ]