Question concerning the repetition index of repeatable groups in document models

Engines Form Engine
1

Question on behalf of @hieu-frosted-bay
Hi, I have a question concerning the repetition index of repeatable groups in document models:
Is it guaranteed that the order of the groups is preserved, i.e. that e.g. an EntityInstance with pathToInstance = “/Items[2]/Name[1]” is always accessible with this repetition array [2,1] after saving and reloading the document?

2

Repeatable groups are lists, i. e. the order of their elements is stable. Of course the indices change when the document is manipulated (e.g. repetitions are deleted / added at the front).

3

Hi @hieu-frosted-bay, it depends on the implementation of com.mgmtp.a12.kernel.md.document.api.IDocument which you are using. Strictly speaking, there is a java.util.Set behind the management of EntityInstances (see IDocument#getEntityInstances). The internal implementation of kernel (used per default while deserializing a document if nothing else configured) uses an own implementation which preserves the order of the EntitiyInstances. As far as I know, DataServices uses the kernel implementation.