old_contents: from django.apps import AppConfig
  
  
  class DjangoCmsSpaConfig(AppConfig):
      name = 'djangocms_spa'
  
      def ready(self):
          from django.forms import CheckboxInput, RadioSelect, Select, SelectMultiple
          from .form_helpers import get_placeholder_for_choices_field, get_serialized_choices_for_field
  
          CheckboxInput.render_spa = lambda self, field, initial: {
              'items': get_serialized_choices_for_field(field=field),
              'type': 'checkbox',
              'multiline': True,
          }
  
          RadioSelect.render_spa = lambda self, field, initial: {
              'items': get_serialized_choices_for_field(field=field),
              'type': 'radio',
              'multiline': True,
          }
  
          Select.render_spa = lambda self, field, initial: {
              'items': get_serialized_choices_for_field(field=field),
              'placeholder': get_placeholder_for_choices_field(field)
          }
  
          SelectMultiple.render_spa = lambda self, field, initial = None: {
              'items': get_serialized_choices_for_field(field=field),
          }
  
new_contents: from django.apps import AppConfig
  
  
  class DjangoCmsSpaConfig(AppConfig):
      name = 'djangocms_spa'
  
      def ready(self):
          from django.forms import CheckboxInput, RadioSelect, Select, SelectMultiple
          from .form_helpers import get_placeholder_for_choices_field, get_serialized_choices_for_field
  
          CheckboxInput.render_spa = lambda self, field, initial: {
              'items': get_serialized_choices_for_field(field=field),
              'type': 'checkbox',
              'multiline': True,
          }
  
          RadioSelect.render_spa = lambda self, field, initial: {
              'items': get_serialized_choices_for_field(field=field),
              'type': 'radio',
              'multiline': True,
          }
  
          Select.render_spa = lambda self, field, initial=None: {
              'items': get_serialized_choices_for_field(field=field),
              'placeholder': get_placeholder_for_choices_field(field)
          }
  
          SelectMultiple.render_spa = lambda self, field, initial=None: {
              'items': get_serialized_choices_for_field(field=field),
          }
  
subject: Add default for 'initial' parameter on Select monkeypatch