Question

class Route(app_core_base_model.AbstractDefaultModel):
code = models.PositiveIntegerField(
    verbose_name=_('code'),
    default=0,
    editable=True)
slug = models.SlugField(
    verbose_name=_('slug'),
    unique=True,
    max_length=255,
    blank=True,
    null=True,
    editable=True,
    db_index=True)

class Route(app_core_base_model.AbstractDefaultModel):
code = models.PositiveIntegerField(
    verbose_name=_('code'),
    default=0,
    editable=True)
slug = models.SlugField(
    verbose_name=_('slug'),
    unique=True,
    max_length=255,
    blank=True,
    null=True,
    editable=True,
    db_index=True)

class StopPoint(app_core_base_model.AbstractDefaultModel):
route = models.ForeignKey(
    Route,
    verbose_name=_('route'))
station = models.ForeignKey(
    app_core_models.Station,
    verbose_name=_('station'))
arrival_time = models.TimeField(
    verbose_name=_('arrival time'),
    blank=True,
    null=True,
    editable=True)
departure_time = models.TimeField(
    verbose_name=_('departure time'),
    blank=True,
    null=True,
    editable=True)

class Station(app_core_base_model.AbstractDefaultModel):
name = models.CharField(
    verbose_name=_('name station'),
    max_length=255,
    blank=True,
    null=True,
    editable=True)
slug = models.SlugField(
    verbose_name=_('slug'),
    unique=True,
    max_length=255,
    blank=True,
    null=True,
    editable=True,
    db_index=True)

我有3个型号我无法提出能够选择所有通过抵达点和出发地点的航班的请求。

如何找到所有经过的路线以及到达目的地的出发点？

Answer 1

这应该可以解决问题。您需要使用反向FK关系。文档：https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.ForeignKey.related_name

station1 = Station.objects.get(...)
station2 = Station.objects.get(...)
routes = Route.objects.filter(
    stoppoint_set__station=station1, 
    stoppoint_set__station=station2).distinct()

Django嵌套查询PostgreSQL

1 个答案: