text: from django.dispatch import receiver
  from django.http import HttpRequest, HttpResponse, JsonResponse
  
  from pretix.base.signals import register_data_exporters
  
  
  class BaseExporter:
      """
      This is the base class for all data exporters
      """
  
      def __init__(self, event):
          self.event = event
  
      def __str__(self):
          return self.identifier
  
      @property
      def verbose_name(self) -> str:
          """
          A human-readable name for this exporter. This should be short but
          self-explaining. Good examples include 'JSON' or 'Microsoft Excel'.
          """
          raise NotImplementedError()  # NOQA
  
      @property
      def identifier(self) -> str:
          """
          A short and unique identifier for this exporter.
          This should only contain lowercase letters and in most
          cases will be the same as your packagename.
          """
          raise NotImplementedError()  # NOQA
  
      @property
      def export_form_fields(self) -> dict:
          """
          When the event's administrator administrator visits the export page, this method
          is called to return the configuration fields available.
  
          It should therefore return a dictionary where the keys should be field names and
          the values should be corresponding Django form fields.
  
          We suggest that you return an ``OrderedDict`` object instead of a dictionary.
          Your implementation could look like this::
  
              @property
              def export_form_fields(self):
                  return OrderedDict(
                      [
                          ('tab_width',
                           forms.IntegerField(
                               label=_('Tab width'),
                               default=4
                           ))
                      ]
                  )
          """
          return {}
  
      def render(self, request: HttpRequest) -> HttpResponse:
          """
          Render the exported file and return a request that either contains the file
          or redirects to it.
  
          :type request: HttpRequest
          :param request: The HTTP request of the user requesting the export
          """
          raise NotImplementedError()  # NOQA
  
  
  class JSONExporter(BaseExporter):
      identifier = 'json'
      verbose_name = 'JSON'
  
      def render(self, request):
          jo = {
              'event': {
                  'name': str(self.event.name),
                  'slug': self.event.slug,
                  'organizer': {
                      'name': str(self.event.organizer.name),
                      'slug': self.event.organizer.slug
                  },
                  'categories': [
                      {
                          'id': c.identity,
                          'name': str(c.name)
                      } for c in self.event.categories.current.all()
                  ],
                  'items': [
                      {
                          'id': i.identity,
                          'name': str(i.name),
                          'category': i.category_id,
                          'price': i.default_price,
                          'admission': i.admission,
                          'active': i.active,
                          'variations': [
                              {
                                  'id': v.identity,
                                  'active': v.active,
                                  'price': v.default_price if v.default_price is not None else i.default_price,
                                  'name': str(v)
                              } for v in i.variations.current.all()
                          ]
                      } for i in self.event.items.current.all().prefetch_related('variations')
                  ],
                  'questions': [
                      {
                          'id': q.identity,
                          'question': str(q.question),
                          'type': q.type
                      } for q in self.event.questions.current.all()
                  ],
                  'orders': [
                      {
                          'code': o.code,
                          'status': o.status,
                          'user': o.user.identifier,
                          'datetime': o.datetime,
                          'payment_fee': o.payment_fee,
                          'total': o.total,
                          'positions': [
                              {
                                  'id': p.identity,
                                  'item': p.item_id,
                                  'variation': p.variation_id,
                                  'price': p.price,
                                  'attendee_name': p.attendee_name,
                                  'answers': [
                                      {
                                          'question': a.question_id,
                                          'answer': a.answer
                                      } for a in p.answers.all()
                                  ]
                              } for p in o.positions.current.all()
                          ]
                      } for o in
                      self.event.orders.current.all().prefetch_related('positions', 'positions__answers').select_related(
                          'user')
                  ],
                  'quotas': [
                      {
                          'id': q.identity,
                          'size': q.size,
                          'items': [i.id for i in q.items.all()],
                          'variations': [v.id for v in q.variations.all()],
                      } for q in self.event.quotas.current.all().prefetch_related('items', 'variations')
                  ]
              }
          }
  
          return JsonResponse(jo)
  
  
  @receiver(register_data_exporters, dispatch_uid="exporter_json")
  def register_json_export(sender, **kwargs):
      return JSONExporter
  