proposal: cascade delete taxonomy -> terms

[MatteoPiovanelli-Laser]

When deleting a taxonomy, all terms in it should also be deleted: these operations should probably be "gated" by checks to make sure references in the system don't break.

Example of what I have in mind.

This is a screenshot of a taxonomy in a tenant on my dev box.
When I hit delete:

• The UI should ask for confirmation
• OnRemoving<TaxonomyPart>() it should check whether the taxonomy is selected in the settings of any TaxonomyField: if that is the case, the operation should fail, and report the reason (e.g. "Taxonomy is selected in field 'foo' in Content Type 'bar'")
• If the taxonomy may be deleted so far, it should invoke the Remove for all Terms belonging to it.
• 'OnRemoving()' it should check whether the term is selected in any TaxonomyField: if that is the case, the depending on a setting on the ContentType for the term, the operation may fail.

cc @sebastienros @HermesSbicego-Laser

[sebastienros]

Sounds good

[BenedekFarkas]

Can this

'OnRemoving()' it should check whether the term is selected in any TaxonomyField: if that is the case, the depending on a setting on the ContentType for the term, the operation may fail.

be true if the parent Taxonomy is not selected for a field?

[MatteoPiovanelli-Laser]

be true if the parent Taxonomy is not selected for a field?

yes, it may be true even if the taxonomy is not selected for a field. For example, in the case of a tenant with multiple Cultures, in the definition of a TaxonomyField you' likely select the taxonomy in you main culture; if later you delete a translation of that taxonomy, you may find its terms have been selected in fields whose "selected" taxonomy is a different one.
I can't guarantee that's the only case, but that's one off the top of my head.

[BenedekFarkas]

I see, thanks! I had a hunch it has something to do with translations, especially since you suggested it. :)