模型.py
class SinglePoint(models.Model):
attributes = models.TextField(blank=True)
name = models.CharField(max_length=100)
geom = models.PointField() #Kartenposition
objects = models.GeoManager()
class Connection(models.Model):
name = models.CharField(max_length=100)
#points = models.ManyToManyField(SinglePoint) #OLD
p1 = models.ForeignKey(SinglePoint, related_name='p1_set') #NEW
p2 = models.ForeignKey(SinglePoint, related_name='p2_set') #NEW
obs = models.ManyToManyField(Observation, blank=True)
conds = models.ManyToManyField(Condition, blank=True)
objects = models.GeoManager()
class Meta:
order_with_respect_to = 'p1'
在我看来.py:
...
p1_points = SinglePoint.objects.filter(name=name)
p2_points = SinglePoint.objects.filter(name=name)
...
在我切换到ForeignKey之前,它适用于:
points = SinglePoint.objects.filter(name=name)
如何将这两个查询集“连接”到一个查询集并创建一个distinct()?
谢谢!
最佳答案
我花了一段时间才找到这个
all_points = p1_points | p2_points
关于python - 如何将 2 个 Django 查询集合并为一个并创建一个 SELECT DISTINCT,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1125844/