如何将2个Django QuerySets合并在一起，并进行SELECT DISTINCT [英] Howto merge 2 Django QuerySets in one and make a SELECT DISTINCT

问题描述

model.py

  class SinglePoint（models.Model）：
 attributes = models.TextField（blank = True）
 name = models.CharField（max_length = 100）
 geom = models.PointField（）#Kartenposition 
 objects = models.GeoManager（）
 
类连接（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'
  

在我的view.py：

  ... 
 p1_points =单点.objects.filter（p1_set__vektordata__order__project__slug = slug）
 p2_points = SinglePoint.objects .filter（p2_set__vektordata__order__project__slug = slug）
 ... 
  

在我切换到ForeignKey之前，使用：

  points = SinglePoint.objects.filter（connection__vektordata__order__project__slug = slug）
  

如何将这两个QuerySets加入到一个QuerySet中并创建一个distinct（）？

解决方案

花了我一段时间找到这个

  all_points = p1_points | p2_points 
  

models.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'

In my view.py:

...
p1_points = SinglePoint.objects.filter(p1_set__vektordata__order__project__slug=slug)
p2_points = SinglePoint.objects.filter(p2_set__vektordata__order__project__slug=slug)
...

Before I switched to ForeignKey, it worked with:

points = SinglePoint.objects.filter(connection__vektordata__order__project__slug=slug)

How to 'join' these two QuerySets to one QuerySet and make a distinct()?

Thanks!

解决方案

It took me a while to find this

all_points = p1_points | p2_points

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