Annotate on recursive relation giving error on PostgreSQL

Hello, I’m getting this PG error while trying to do a count on a recursive relationship.

tortoise.exceptions.OperationalError: column “task.estimated_start_date” must appear in the GROUP BY clause or be used in an aggregate function

class Task(BaseModel):
    mother = fields.ForeignKeyField('models.Task', null=True, related_name="children")
#Some code later...
tasks = await Task.filter(mother=None).annotate(children_count=Count("children"))

Am I doing something wrong?

What I’m trying to achieve with my query, is a hierarchical view of the tasks, first I’m getting the “outer” ones, and then checking if they have any children so then I will display a dropdown arrow that will asynchronous load the children and so on.

[grigi]

Release 0.16.4 os out with the fix, please confirm.

[grigi]

It should be fixed in next release. You can test out develop doing a pip install https://github.com/tortoise/tortoise-orm/archive/develop.zip