TreeModel based on repeatable groups instead of relations

Modeling
1

Hi,

can I use a TreeModel for repeatable groups? I don’t want to split the model and introduce an artificial relation.

Tobias

2

Hi @tobias-amber-boulder,

Tree engine (and also Relationship engine) is built around the relationships between document models and currently, there is no support for the relationship between groups inside a document model. Could you share your use case so I can investigate more?

Also, in my two cents, to support this feature, A12 will have to introduce another concept of relationships between groups inside a document model. This new feature would still involve you to do some “migration works” like creating relationship between your groups then modelling your tree model.

Best regards,
Tri

3

My model is quite simple. Here is an anagolous situation.

Contract

has a [0…n] - relation to invoices

Invoice
* date
* description
* position [1..10]
** period
** amount

I do not want a treeview to list contracts and invoices.
Instead I’d like to use a treeview for a single contract to list all invoices and positions by opening the “tree”.

And I don’t want to introduce a new [1…10]-relation from “invoice” to “position” for this.

4

I fully agree with Tobias: repeatable (nested) groups are a powerful concept which deserves IMHO to be supported by tree models too. Albeit this seems not be implemented yet, I do not see why this should be hard, since trees are semantically similar to nested detached repeats.
Aside from complexity of such a split I would argue against splitting the models because one would loose expressive power: data modeled repetitions have advantages of modelling with powerful rules which can not be expressed by overview models. See <INTERNAL_LINK> and Repetition modeling in A12 applications: the case for data modeling for a discussion.

The use cases mentioned by Tobias show some similarity with cross links as described in https://discourse.geta12.com/t/crossreferencing-and-cross-navigation-in-and-between-forms/218/4?u=jknopp. This cross connect approach is designed for detached repeats (and overview models) but would work with treeviews for repeatable groups, too.

5

I’ve created a new requirement for this : A12-11772
<INTERNAL_LINK>