After deleting resources, they are still annotated as non-importable when selecting them to re-import

Observed behavior

Watch this video of me deleting, then re-importing content from Touchable Earth.

Steps:

1. I delete all the contents of a topic (but not the entire topic itself)
2. I wait for the deletion task to finish
3. I go back to TE > Import more
4. I go to the topic and it is flagged as non-importable (the checkbox is disabled)
5. But if I follow the link into the topic, the child nodes are flagged as importable.

Expected behavior

After deleting objects, if I go back to re-import them, the topic node is properly annotated as “importable”

Root cause

My suspiscion is that there is something wrong in the ContentNodeGranular viewset. It may have to do with caching.

Steps to reproduce

Do something similar to the instructions in “Observed Behavior”

Context

Kolibri 0.14.7

[rtibbles]

In that case, we need to update the earlier update to available=False, on_device_resources=0 - that would seem to account for it!

[kmrinal19]

This is taken into account by this line: https://github.com/learningequality/kolibri/blob/0c2b49a5e7d7df399216119f96098d48e3554b76/kolibri/core/content/utils/annotation.py#L552

Here, all topics in a channel are first marked as not available, so only those with any descendants are marked as available.

Since all the topics are first marked as not available, and only those with any descendants are updated later, the topics without any descendants have the on_device_resources field unchanged. In the frontend, the checkbox is disabled when the condition on_device_resources === total_resources holds true. Since the on_device_resources field is unchanged in the backend, we are unable to import the topic from the frontend. https://github.com/learningequality/kolibri/blob/0c2b49a5e7d7df399216119f96098d48e3554b76/kolibri/plugins/device/assets/src/views/SelectContentPage/treeViewUtils.js#L87-L94