text: from django.db import migrations
  
  
  def correct_blood_donation_values(apps, *args):
      patientmodel = apps.get_model("facility", "patientregistration")
      patientmodel.objects.all().update(will_donate_blood=None, fit_for_blood_donation=None)
  
  
  def reverse_correct_blood_donation_values(apps, *args):
      pass
  
  
  class Migration(migrations.Migration):
      dependencies = [
          ("facility", "0184_auto_20200925_2353"),
      ]
  
      operations = [
          migrations.RunPython(correct_blood_donation_values, reverse_code=reverse_correct_blood_donation_values)
      ]
  