for some background, I am creating a field "scope"

func (DependencyResolution) Fields() []ent.Field {
	return []ent.Field{
		field.Bool("circular").Default(false),
		// "Direct" string used as a place holder, fixed with sed in generate_ent.sh
		field.Enum("scope").GoType(scope.Scope(0)).Default("Direct"),
	}
}

this generates the code

const DefaultScope scope.Scope = "Direct"

if I don't provide a default value, it works (but then anything that doesn't set it, fails). even though scope.Scope implements all the required interfaces for a custom GoType, it can't be a string, I have a hack, that works by running a sed script as part of the same go:generate code to do something like

sed -i "" 's/const DefaultScope.*/const DefaultScope scope.Scope = scope.Direct/' ./ent/table/table.go

but this is such a hack, I'm not keen on using it.

The reason for wanting to use Default, as it impacts out schema (and the ALTER TABLE we produce)

i.e. instead of

scope character varying NOT NULL

we get (schema generated after the sed operation).

scope character varying DEFAULT 'Direct'::character varying NOT NULL

In pondering this, I might instead make it optional/nillable. as that would make an alter table less intrusive with just having to handle the nill as the zero value.