this is a bug. however, the Query object is legacy. what is your actual use
case? there are better ways to achieve them now.
On Thu, Feb 25, 2021, at 3:25 PM, Ahmed wrote:
> Hello,
>
> It seems that SQLAlchemy 1.4.0b3 ignores relationship() query_class
> parameter. Here's the snippet that works with 1.3 but doesn't with 1.4:
>
> class Parent(db.Model):
> __tablename__ = "todo"
> id = db.Column(db.Integer, primary_key=True)
> # ... Column mappings
> children = db.relationship("Child", backref="todo",
> query_class=DerivedQuery, lazy="dynamic")
>
> class Child(db.Model):
> __tablename__ = "todo"
> # ... Column mappings
> parent_id = db.Column(db.Integer, db.ForeignKey("todo.id"))
>
> assert isinstance(p.children, DerivedQuery)
>
> In 1.4, children attribute is always an instance of AppenderQuery regardless
> of the query_class value. I might have missed something above though.
>
>
>
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