如何在session.query中执行“加入”

Question

我有以下SQLAlchemy映射的类：

class TagValue(Model):
    tag_value_id = Column(Integer, primary_key=True)
    tag_value_name = Column(String(255))

    def __repr__(self):
        return '{}'.format(self.tag_value_name)

tag_values_table = Table('tag_values', Model.metadata, 
    Column('tag_id', Integer, ForeignKey('tag.tag_id'), 
primary_key=True),
    Column('tag_value_id', Integer, 
ForeignKey('tag_value.tag_value_id'), primary_key=True))


class Tag(Model):
    tag_id = Column(Integer, primary_key=True)
    tag_name = Column(String(255))
    tag_value = relationship("TagValue", secondary=lambda: 
tag_values_table, backref="tag")

    def __repr__(self):
        return '{}'.format(self.tag_name)

表视图如下：

从标记中选择*；

 tag_id |  tag_name   
--------+-------------
      1 | Lever
      2 | Department
      3 | Data Source
      4 | Category
      5 | Term
      6 | Where Used

从tag_value中选择*；

tag_value_id |  tag_value_name  
--------------+------------------
            1 | Engage
            2 | Convert
            3 | Deliver
            4 | Retain
            5 | Marketing
            6 | Sales
            7 | Operations
            8 | Finance

从tag_values中选择*；

 tag_id | tag_value_id 
--------+--------------
      1 |            1
      1 |            2
      1 |            3
      1 |            4
      2 |            5
      2 |            6
      2 |            7
      2 |            8

如何使用session.query与这三个表进行联接，以使结果查询返回以下表

 tag_name   |  tag_value_name  
-------------+------------------
 Lever       | Engage
 Lever       | Convert
 Lever       | Deliver
 Lever       | Retain
 Department  | Marketing
 Department  | Sales
 Department  | Operations
 Department  | Finance

我已经使用了上面的表格：

select t.tag_name,tv.tag_value_name from tag_values tvs join tag t 
on t.tag_id = tvs.tag_id join tag_value tv  on tv.tag_value_id = 
tvs.tag_value_id;

如何使用session.query获得相同的条件？