new_contents: # Generated by Django 2.2.14 on 2020-07-22 12:38
  
  from django.db import migrations
  
  
  def migrate_checks(apps, schema_editor):
      Payment = apps.get_model("payments", "Payment")
  
      Payment.objects.filter(mode="check").filter(type="don").update(
          mode="check_donations"
      )
      Payment.objects.filter(mode="check").filter(type="evenement").update(
          mode="check_events"
      )
  
  
  def unmigrate_checks(apps, schema_editor):
      Payment = apps.get_model("payments", "Payment")
  
      Payment.objects.filter(mode="check_donations").update(mode="check")
      Payment.objects.filter(mode="check_events").update(mode="check")
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ("checks", "0001_checkpayment"),
      ]
  
      operations = [migrations.RunPython(migrate_checks, unmigrate_checks)]
  
subject: migrate to new modes