session variables

[jason....@gmail.com]

Hi all,

This is probably a silly question, but one that I haven't been able to figure out by looking at the documentation.

When I was last using oTree, I was able to call a session level variable inside a method using something like "self.session.vars['blah']". However, there is no self and methods are defined over classes.

When I create a method now, there seems to be a problem with calling session.vars. For example

def func(subsession: Subsession):

      session.vars['X'] = a

the session will throw an unresolved reference error.

Again, sorry for the silly question, but how do I call a session variable in a method defined for another class?

[Chris @ oTree]

You can get the current session from any other model, eg 

session=subsession.session

see here: https://otree.readthedocs.io/en/latest/conceptual_overview.html#object-hierarchy

By the way see the new SESSION_FIELDS which is a more convenient access to session vars. 

[Itamar Bellaiche]

Hi Chris and thank you!

Could you maybe please give an example of how to work with SESSION_FIELDS ?

Where in the code do you assign the specific value of the session?

Thanks,

Itamar

[Chris @ oTree]

In the same place where you would normally assign session.vars. See examples here: https://www.otreehub.com/code/

Sent from my phone

On Aug 11, 2021, at 5:05 AM, Itamar Bellaiche <itamar.b...@mail.huji.ac.il> wrote:

Hi Chris and thank you!

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[Chris @ oTree]

For example:

session.matrices

session.past_groups

Etc....

Sent from my phone

On Aug 11, 2021, at 8:15 AM, ch...@otree.org wrote:

In the same place where you would normally assign session.vars. See examples here: https://www.otreehub.com/code/