Cannot use created_at or any timestamp columns to query: ambiguous column name

[niiamon]

Fell into another issue here with acts_as_relation. From the dummy project in the acts_as_relation code, I run the migrations and then created a few objects. However, it's not possible to execute a query like this:

Pencil.where("created_at <= ?", Date.new())

You get an "ambiguous column name" error. Other than removing the created_at and updated_at columns on the subclasses or parent class, is there another way to get around this?

[barriault]

This works:

Pencil.where("pencils.created_at <= ?", Time.now)

[niiamon]

RIght. I'm going to give that a go. Thanks.