this will be fixed in https://github.com/sqlalchemy/sqlalchemy/issues/5981
where I've reverted entirely some changes to AppenderQuery that made it work
more in 2.0 style. As Query is going to be present in 2.0, "dynamic"
relationships will remain also as legacy. They are superseded by explicit use
of the with_parent() filtering construct.
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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