Impossible to load value from lookup table

Users
#1

I cannot use lookup tables in hidden values. I have configured according to the help page:
https://confluence.dimagi.com/display/commcarepublic/Setup+a+Question+with+Filtered+Choices#SetupaQuestionwithFilteredChoices-Loadingalookuptablevalueintoahiddenvalueinsteadofamultiplechoice/checkboxquestion

The hidden value is called “albendazole_key”
The calculation is:
instance(‘item-list:age_classes’)/age_classes_list/age_classes[class_key = ‘8’]/albendazole

The table is called “age_classes” and has the columns “class_key” and "albendazole (and others)
The table is indexed for the column “class_key”

I have tried everything:

  • with “item-list” and without
  • with single quotations (’) and double quotations (")
  • different indexes (1,5,7,8)

No success, I cannot load the form, the error on the mobile device is:
instance(age_classes)/age_classes_list/age_classes[class_key=‘8’]/albendazole
has not been loaded.

#2

Hi Rafael,

Are you sure there are not two places in your form where you are referencing the table? You said that your calculation was

instance(‘item-list:age_classes’)/age_classes_list/age_classes[class_key = ‘8’]/albendazole

(this reference looks correct to me) but that the error message was

instance(age_classes)/age_classes_list/age_classes[class_key=‘8’]/albendazole

Which appears to be using a different ID for the instance reference (‘age_classes’ v. ‘item-list:age_classes’)

You may have a lingering reference somewhere in the form, maybe in the lookup table question or other?

#3

Thank you for you support.
In the meantime I could solve the problem by putting class_key into quotation marks. It makes no sense to me, but it works:
instance(‘item-list:age_classes’)/age_classes_list/age_classes[‘class_key’ = ‘8’]/albendazole