Question

我正在尝试为here中看到的数据复制数据方案。每次发射都有一个带有单个垫的位置，当前定义我的模型，如下所示：

class Location(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=255, blank=True, default="")
    country_code = models.CharField(max_length=255, blank=True, default="")

def __unicode__(self):
    return self.name

class Meta:
    verbose_name = 'Location'
    verbose_name_plural = 'Locations'


class Pad(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=255, blank=True, default="")
    info_url = models.URLField(blank=True, null=True)
    wiki_url = models.URLField(blank=True, null=True)
    map_url = models.URLField(blank=True, null=True)
    location = models.ForeignKey(Location, related_name="pads", blank=True, on_delete=models.CASCADE)

def __unicode__(self):
    return self.name

class Meta:
    verbose_name = 'Pad'
    verbose_name_plural = 'Pads'

如果我从Django外壳查询启动，或者如果我使用Django Restframework序列化（seen here）启动，它将所有护垫拉到某个位置，而不是一个单独的发射台。

示例：

"location": {
    "id": 16,
    "name": "Cape Canaveral, FL, USA",
    "country_code": "USA",
    "pads": [
        {
            "id": 62,
            "name": "Space Launch Complex 37B, Cape Canaveral, FL",
            "info_url": null,
            "wiki_url": "https://en.wikipedia.org/wiki/Cape_Canaveral_Air_Force_Station_Space_Launch_Complex_37",
            "map_url": "http://maps.google.com/maps?q=28.531700,-80.564950"
        },
        {
            "id": 84,
            "name": "Space Launch Complex 40, Cape Canaveral, FL",
            "info_url": "",
            "wiki_url": "https://en.wikipedia.org/wiki/Cape_Canaveral_Air_Force_Station_Space_Launch_Complex_40",
            "map_url": "http://maps.google.com/maps?q=28.56194122,-80.57735736"
        }
    ]

如何获取关系以正确地仅显示分配给发射的一个打击垫，而不是返回某个位置的所有可能的打击垫，以便我的实现与第一个链接中所示的原始功能相匹配？

编辑：

好了，现在数据以正确的格式存储在数据库中了，如外壳程序所示，启动在某个位置有一个垫子。剩下的问题是如何序列化它以使其完全像原始数据源一样返回，即使用launch-> location-> single-pad：

>>> launch = Launch.objects.first()
>>> launch
<Launch: Falcon Heavy | STP-2>
>>> launch.pad
<Pad: Launch Complex 39A, Kennedy Space Center, FL>
>>> launch.pad.location
<Location: Kennedy Space Center, FL, USA>
>>> launch.pad.location.pad.all()
<QuerySet [<Pad: Launch Complex 39A, Kennedy Space Center, FL>, <Pad: Launch Complex 39B, Kennedy Space Center, FL>]>

Django Rest Framework-具有嵌套外键的模型关系

0 个答案: