Default value for tree species

Hi András,
Your expressions are correct and should give you the expected results (don't forget that the default value is applied only when the new row of the tree table is created).
Please try to use $context instead of $this/parent() and modify your Apply when expression into just tree_id > 1.
Also, please ensure that you are using the latest version of Collect.
Many thanks,
Open Foris Team

Hi András,
Is the attribute tree_id a calculated attribute? If not, your expression won't work because when you create a new tree, there is no value for that attribute and the expression $this/parent()/tree_id - 1 cannot be calculated.
There is another solution that can work and uses the idm:position function. Take into account that you can use the variable $context that is equal to $this/parent().
If you only need to get the value of the previous tree, the expression can be:

parent()/tree[idm:position($context) - 1]/species

Let us know if it feets your needs.
Many thanks,
Open Foris Team

Hi András,
What you can do in your case is to define a previous_tree_species that gives you the value of the user_specified_species of the previous tree when the expression fork is verified and a user_specified_species attribute that is relevant only when the expression not(fork) is verified. Then you can create a combination of the 2 attributes in another calculated attribute that gives you a value or the other, if the tree is a fork or not, and in analysis you can use this final attribute.
Please let us know, thanks.
Open Foris Team

Hi all,

thank you for this useful expression. I have used it extensively in my survey. However, while it works fine in most cases, I do have a problem with an attribute (code) that is relevant (and visible) "only when expression is verified" related to the previous attribute. Here, the expression parent()/entity[idm:position($context)-1]/region does not work. When I remove the condition (relevant if expression), the fill with previous values works fine.

Any idea what I could do to make it work in this case?

Cheers,

Alex