Filemaker has a pattern where you can set the choices of a field to be
the indexed contents of that field.

Along with an "Other..." choice option to add a new value.

This is a very handy way of having user modified choices for a given
field.

Now I can think of several ways to do this in a form field init, but
it seems like there should be a more reusable way to do it with a
custom field type or mixin by overriding get_choices on the field
object.

Has anyone done something like this?

-Preston

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