# 查询所有图书 、 增加图书
def get(self,request):

  queryset = BookInfo.objects.all()
  book_list = []

  for book in queryset:
    book_list.append({
      'id':book.id,
      'bread':book.bread

    })
  return JsonResponse (book_list,safe=False)
 

def __init__(self, data, encoder=DjangoJSONEncoder, safe=True,
       json_dumps_params=None, **kwargs):
  if safe and not isinstance(data, dict):
    raise TypeError(
      'In order to allow non-dict objects to be serialized set the '
      'safe parameter to False.'
    )
 
 if json_dumps_params is None:
    json_dumps_params = {}
  kwargs.setdefault('content_type', 'application/json')
  data = json.dumps(data, cls=encoder, **json_dumps_params)
  super(JsonResponse, self).__init__(content=data, **kwargs)