Custom Fields on Activity Types

[JohnFF]

A couple of use cases:
- some activity types should be created automatically by PHP, others are available for users to create
- we want staff to be able to say which activities that alumni have can be viewed through the teacher dashboard, which can be added by the teachers using it, etc.

The distinction here is that we can add flags to specific activity types as opposed to activities themselves.

What do all y'all think?

[JonGold]

Activity Types are part of the OptionValue entity these days.

I can see some convincing arguments for custom fields on OptionValue, mostly to do with customization like this.  You could also use them with the EntityRef to create chained selects (like how the values in State/Province are dependent on the selected Country).

As with most custom fields, the problem is more about having a good UI than about adding custom fields to a new entity.

[Dave Greenberg]

You could potentially use civicrm_option_value.grouping to store flag(s) which control usage for the activity types. This property is not currently exposed in the admin UI for Activity Types - but is used for somewhat similar purpose for some other option groups.