Define a class method to introspect valid delegatable types so they can #50662
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Motivation / Background
While dealing with strong parameters in API requests and validating the polymorphic type field for a delegated type in a slightly abstract manner, its useful to have access to the allowed types.
Detail
This Pull Request changes the methods defined by ActiveRecord::DelegatedType
Additional information
N/A
Checklist
Before submitting the PR make sure the following are checked:
[Fix #issue-number]