Forum OpenACS Q&A: parameter::get_from_package_key problem

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1: parameter::get_from_package_key problem
Posted by Claudio Pasolini on 10/13/25 07:39 PM
In a new oacs-5-10.1 package I added a couple of instance parameters setting the default values, but after changing the values via site-map the API doesn't return the expected results.
Executing an sql query against the apm_parameter_values woks well. I temporary solved the problem adding the parameters to /etc/config.tcl and in this case the API works well. but this is far from ideal.

Any help would be much appreciated.

Claudio

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2: Re: parameter::get_from_package_key problem (response to 1)
Posted by Gustaf Neumann on 10/13/25 08:05 PM
The usage of "parameter::get_from_package_key" is problematic, if there are multiple instances of packages with this key. The function predates global parameters, and returns either the value from the config file, or the value of a global parameter, or the value of a package instance parameter, if the package is defined as a singleton package.

Is the package defined as a singleton package?
If you really want to use instance parameters, you should probably not use parameter::get_from_package_key.

Here you can see the semantics of the function clearly:
https://openacs.org/api-doc/proc-view?proc=parameter::get_from_package_key&source_p=1