RT::CustomFieldValues::External - Pull possible values for a custom field from an arbitrary external data source.
Custom field value lists can be produced by creating a class that inherits from RT::CustomFieldValues::External, and overloading SourceDescription and ExternalValues. See RT::CustomFieldValues::Groups for a simple example.
Subclasses should implement the following methods:
This method should return a string describing the data source; this is the identifier by which the user will see the dropdown.
This method should return an array reference of hash references. The hash references should contain keys for name, description, and sortorder.
docs/extending/external_custom_fields.pod
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