Writing a new script in the script library and I want to change a session property inside of it. There’s no drop down selector to pick a property. How can I reference the session property from a script library? Do I need to pass a reference to self?

So there is nothing to replace Client tags in 8.0? I have almost 100 functions defined in a script library and want to change the database they point to based on the plant selected. I have a session property that does this for everything else but I can’t use it at the beginning of the script librar…

In theory, the InternalSession.SESSION ThreadLocal would be populated if you’re running a project script from a Perspective thread; so something like this might work: from com.inductiveautomation.perspective.gateway.session import InternalSession session = InternalSession.SESSION.get() if session…

Hah! And I thought I was bad about exposing unsupported and undocumented implementation details… (:

[image] pturmel: unsupported and undocumented Definitely true. Phil's suggestion to pass explicit parameters is the only non-magic way to do this. And I don't want any PMs about this thread in three years when we end up breaking someone's code :slight_smile:

Ok so the way to do it would be something like def myFunc(self): self.session.custom.myCustomProp = 1 or to use your undocumented method and then DM you in a few years when it breaks right? :sweat_smile: I get how this would work with hardcoded custom session properties I know exists, but say…

Use Python’s getattr builtin; the following examples will both achieve the same result: x = self.session.custom.myCustomProp x = getattr(self.session.custom, "myCustomProp") The corresponding reverse function would be setattr: setattr(self.session.custom, "myCustomProp", 1)

You really should reconsider passing self or session.self to your script libraries, except maybe to helpers to extract specific blocks of Perspective data or to re-encode (json) results for Perspective’s use. For any script module function, ask yourself if the core logic would be applicable outside…

I was planning on making getter/setter functions with using undocumented way to try to do that. But, if I want to do it in a fully documented way, and I need to pass the necessary info, and I shouldn’t pass self, how would you recommend doing it? Won’t we at some point necessarily need a self so t…

Yes, pass self.session to your Perspective-specific helpers. Pass that result to your generic business/process logic. In simple cases, just do everything needed with self in the event.

Right - invert your assumptions. If you need to do something with session properties, then only assume you have a session object in your project script: def doSomething(session): session.custom.something = 123 And then call it with the shortcut to the session object you get from all perspectiv…

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Referencing a session prop from a script library?

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