Django 内连接父 model 与子 model

Question

我有这张桌子

class OtherTable(models.Model):
#some attributes

class Parent(models.Model):
#some attributes

class Child1(models.Model):
    parent = models.ForeignKey(Parent)
    #more attributes

class Child2(models.Model):
    parent = models.ForeignKey(Parent)
    #more attributes


class Child3(models.Model):
    parent = models.ForeignKey(Parent)
    other_table = models.ForeignKey(OtherTable)
    #more attributes

如何加入所有表？

我想使用 django 的 ORM 执行等效的 SQL 查询：

select *
from parent 
inner join child1 on parent.id = child1.parent_id
inner join child2 on parent.id = child2.parent_id
inner join child3 on parent.id = child3.parent_id
inner join othertable on other.id = child3.other_table_id

现在我有这个 Django ORM 但我想将所有表连接在一起：

Child1.object.select_related('parent').query.sql_with_params()
Child2.object.select_related('parent').query.sql_with_params()
Child3.object.select_related('parent', 'other_table').query.sql_with_params()

Answer 1

  a = Child1.object.select_related('parent').query.sql_with_params()
  b = Child2.object.select_related('parent').query.sql_with_params()
  c = Child3.object.select_related('parent', 'other_table').query.sql_with_params()

  result = a | b | c