How do I create a customized abort_page for the al.ListRandomizer?

[slussinator]

I would like to create a custom abort_page for participants trying to reach an experiment whose slots are currently filled.
The following minimal experiment recreates my attempt so far. I keep getting the error message "abort page must be a page". But it seems to me I have created an abort_page which is a page?
Please help!

import alfred3 as al
exp = al.Experiment()


@exp.setup  # Setup dass die Bedingungen generiert
def setup(exp):
    exp.stud_randomizer = al.ListRandomizer(
        # der randomizer lässt ine Listenrandomisierung zu hierbei wird ("Bedingung", Anzahl gewünschter Probenden angegeben)
        ("m_transact1", 1),
        ("m_transform1", 0),
        ("w_transact1", 0),
        ("w_transform1", 0),
        name="stud_randomizer",
        exp=exp,# hier wird das verwendete Experiment definiert. In diesem Fall eben unser exp
        respect_version=True,
        abort_page=abort_page
    )
    exp.condition = exp.stud_randomizer.get_condition()
    exp.log.info(exp.condition)

@exp.member
class dummy_page(al.Page):
    def on_exp_access(self):
        self += al.Text("this is a dummy page")


class abort_page(al.Page):
    def on_exp_access(self):
        self += al.Text("Leider sind alle Teilnahmeslots für diese Erhebung belegt. ")


if __name__ == "__main__":
    exp.run()

[jobrachem]

The abort_page should be a page instance, but you are providing a page class. An example for correct usage can be found here: https://alfredo3.psych.bio.uni-goettingen.de/docs/generated/alfred3.randomizer.ListRandomizer.get_condition.html#alfred3.randomizer.ListRandomizer.get_condition

Here's a copy of that example:

import alfred3 as al
exp = al.Experiment()

@exp.setup
def setup(exp):
    full_page = al.Page(title="Experiment closed.", name="fullpage")
    full_page += al.Text("Sorry, the experiment currently does not accept any further participants.")

    randomizer = al.ListRandomizer(("cond1", 10), ("cond2", 10), exp=exp, abort_page=full_page)

    exp.condition = randomizer.get_condition()


@exp.member
class DemoPage(al.Page):

    def on_exp_access(self):

        if self.exp.condition == "cond1":
            lab = "label in condition 1"

        elif self.exp.condition == "cond2":
            lab = "label in condition 2"

        self += al.TextEntry(leftlab=lab, name="t1")

[slussinator]

Thank you! This works :) Just as a comment, I did read the al.ListRandomizer page but did not know that I would have to look at the al.ListRandomizer.get_condition page to find the answer. A hyperlink on the abort_page parameter description on the al.ListRandomizer page might be helpful.

[jobrachem]

I agree, the discoverability of this example is not optimal. Glad to hear that it works for you now! :)