content: from django.db import migrations, models
  
  
  def update_link_buttons(apps, schema_editor):
      CustomLink = apps.get_model('extras', 'CustomLink')
      db_alias = schema_editor.connection.alias
  
      CustomLink.objects.using(db_alias).filter(button_class='outline-dark').update(button_class='default')
  
  
  class Migration(migrations.Migration):
      dependencies = [
          ('extras', '0115_convert_dashboard_widgets'),
      ]
  
      operations = [
          migrations.AlterField(
              model_name='customlink',
              name='button_class',
              field=models.CharField(default='default', max_length=30),
          ),
          migrations.RunPython(code=update_link_buttons, reverse_code=migrations.RunPython.noop),
      ]
  