28. How to show many to many or reverse FK fields on listview page?

For heroes you can track their father using this field:

father = models.ForeignKey(
    "self", related_name="children", null=True, blank=True, on_delete=models.SET_NULL
)

You have been asked to show the childeren of each Hero, on the listview page. Hero objects have the children reverse FK attribute, but you can’t add that to the :code`:list_display. You need to add an attribute to ModelAdmin and use that in list_display. You can do it like this:

@admin.register(Hero)
class HeroAdmin(admin.ModelAdmin, ExportCsvMixin):
    ...

    def children_display(self, obj):
        return ", ".join([
            child.name for child in obj.children.all()
        ])
    children_display.short_description = "Children"

You will see a column for children like this:

You can use the same method for M2M relations as well. You should also read How to get Django admin urls for specific objects?.

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