Is there any way to add aggregation in migration like we add type?
We do something like this in the migration file - we add the type of the field.
def change do
create table("mall") do
add :visitors, :integer
add :total_time, :integer
timestamps()
end
end
Is there any way we could add aggregation in migration file? Like for example I would like the field visitors
to have aggregation sum and total_time
to have aggregation sum /visitors. Or can this be only done through queries?