python - Django:在 JSON 字符串中包含相关模型？

Question

构建于 this question ，现在我有另一个问题。鉴于此，

shipments = Shipment.objects.filter(filter).exclude(**exclude).order_by(order) \
    .annotate(num_bids=Count('bids'), min_bid=Min('bids__amount'), max_bid=Max('bids__amount')) \
    .select_related('pickup_address','dropoff_address','billing_address')

return HttpResponse(simplejson.dumps(list(shipments.values()), ensure_ascii=False, default=json_formatter), mimetype='application/json')

它实际上并不包含 JSON 中的 pickup_address 等。我怎样才能让它包含相关字段？

Answer 1

您可以使用包含装运字典的列表推导式，并填写相关对象。此 API 为客户端提供每个地址的显式名称。位置符号使得运送到帐单地址变得非常容易。 Josh Block's "How to Design a Good API and Why it Matters"值得一读。

shipments = [{
    'shipment':s,
    'pickup_address': s.pickup_address, 
    'dropoff_address': s.dropoff_address, 
    'billing_address': s.billing_address,
} for s in shipments]

return HttpResponse(simplejson.dumps(shipments, ensure_ascii=False, default=json_formatter), mimetype='application/json')