Question

Can I do

table.relationship.filter( column = value )

to get a subset of rows for relationships? and the same for order_by?

Answer 1

According to the relationship() documentation, you can use order_by keyword argument with relationships, to set the order that will be returned. On the same page, it mentions that you can also use primaryjoin keyword argument to define extra join parameters. I think that can be used for the filter you want.

Example:

tasks = relationship(
    "Task",
    order_by="Task.priority",
    primaryjoin="and_(Task.list_id==List.id, Task.completed==None)",
    back_populates="task_list",
)