Fetching children of a Data Model from the tree does not order the child tree items correctly

[pjmonks]

Description

When expanding the model tree from MDM UI and expanding a data model to view data classes below, the order is not alphabetical.

Steps to reproduce

1. Create a data model with data classes. Ensure a mix of data class labels beginning with different letters.
2. Use the endpoint GET /api/tree/folders/dataModels/{dataModelId}
3. Check the order of data classes returned.

Expected behavior

The returned list should always be in ascending alphabetical order. Currently it seems non-deterministic.

Related

• Class list in alphabetical order NHSDigital/DataDictionaryPublication#405

Note also that this might be a fixed issue, but NHSE have raised a UI issue too - read the linked issue for more details.