Python SQLAlchemy中ForeignKey上的查询过滤器

为了简化，我有两个表（ORM FastAPI）

一个对象可以有多个属性（1-N关系）。 属性是动态的（取决于对象，某些对象有10个属性，或50个…）

例如：

Object      | Attributes
---------------------------------
Object 1    | color = red
            | form = round
            | level = 5
            | ...
            | attribute alpha
---------------------------------
Object 2    | color = red
            | form = square
            | level = 2
            | ...
            | attribute beta

我想做一些类似的事情：

“查找定义了attribute.color=red、attribute.level>=2和attribute.X的所有对象”

我试过：

query = db.query(Object).options( 
 joinedload(Attributes,innerjoin=False)).join(Attributes)
query = query.filter(Attributes.attribute == 'color')
query = query.filter(Attributes.value == 'red')
...
return query.all()

但是我不知道如何在表属性上级联过滤器

---

感谢您的帮助…

要实现过滤器，我将使用：

这将生成SQL语句（具体取决于DB引擎）：

---

这正是我丢失的代码，谢谢！！！！

query = db.query(Object).options( 
 joinedload(Attributes,innerjoin=False)).join(Attributes)
query = query.filter(Attributes.attribute == 'color')
query = query.filter(Attributes.value == 'red')
...
return query.all()

query = (
    session.query(Object)
    # -- NOTE: below join is not needed for the filter part;
    # .options(joinedload(Attributes, innerjoin=False))
    # .join(Attributes)
    # add additional criteria
    .filter(
        Object.attributes.any(
            and_(
                Attributes.attribute == "color",
                Attributes.value == "red",
            )
        )
    )
    .filter(
        Object.attributes.any(
            and_(
                Attributes.attribute == "level",
                func.cast(Attributes.value, Integer) >= 2,
            )
        )
    )
    .filter(Object.attributes.any(Attributes.attribute == "X"))  # exists
)

SELECT object.id,
       object.name
FROM object
WHERE (EXISTS
         (SELECT 1
          FROM attributes
          WHERE object.id = attributes.parent_id
            AND attributes.attribute = 'color'
            AND attributes.value = 'red'))
  AND (EXISTS
         (SELECT 1
          FROM attributes
          WHERE object.id = attributes.parent_id
            AND attributes.attribute = 'level'
            AND CAST(attributes.value AS INTEGER) >= 2))
  AND (EXISTS
         (SELECT 1
          FROM attributes
          WHERE object.id = attributes.parent_id
            AND attributes.attribute = 'X'))