Extending label for foreign field in admin

My application displays a foreign field in a TabularInline form like this:

class RecipeIngredientInlineAdmin(admin.TabularInline):
	model = RecipeIngredient
	readonly_fields = ['get_unit']

	def get_unit(self, obj):
		if obj.ingredient:
			return obj.ingredient.unit.name
		return ''
	get_unit.short_description = 'Unit'
	fieldsets = [ ( None, { "fields": ["quantity", "get_unit", "ingredient", "position", "group"], },), ]

This works well when displaying a recipe, but if I change/add a new ingredient for a recipe via the TabularInline form (with unit.name already defined for this ingredient), get_unit remains empty, or displays the unit of the previous ingredient. Is it possible to include the unit in the ingredient label, without overriding the __str__ method for the Ingredient class globally?

Jan

I found a solution: 8. How to change ForeignKey display text in dropdowns? — Django Admin Cookbook 2.0 documentation