tortoise
computed column
Is it possible to add a computed column to a sqlite database with Tortoise ORM? And if it is how do i do it?
Сan I join this question. Is it possible to make a calculated field that uses stored procedures in DB?
For example, is it possible in Model adding next field:
class Mission(Model):
targets = ReverseRelation["Target"]
targets_count = CalculatedField(int, "get_targets_count", "id")
class Target(Model):
mission: ForeignKeyRelation[Mission] = ForeignKeyField("models.Mission", related_name="targets")
where CalculatedField means that will be used stored procedure with parameter
CREATE OR REPLACE FUNCTION public.get_targets_count(m_id integer)
RETURNS bigint
LANGUAGE sql
AS $function$
select count(*) from target where mission_id = m_id;
$function$;
This is very useful for queries with relationships for submodels. Using annotate doesn't seem to solve the problem with related fields.
This would be extremely helpful. Django already released on version 5.0 the GeneratedField, which basically creates a field that is always computed based on other fields in the model.
