Searching by related fields in django admin

I've been looking at the docs for `search_fields` in django admin in the attempt to allow searching of related fields. So, here are some of my models. ``` # models.py class Team(models.Model): name = models.CharField(max_length=255) class AgeGroup(models.Model): group = models.CharField(max_length=255) class Runner(models.Model): """ Model for the runner holding a course record. """ name = models.CharField(max_length=100) agegroup = models.ForeignKey(AgeGroup) team = models.ForeignKey(Team, blank=True, null=True) class Result(models.Model): """ Model for the results of records. """ runner = models.ForeignKey(Runner) year = models.IntegerField(_("Year")) time = models.CharField(_("Time"), max_length=8) class YearRecord(models.Model): """ Model for storing the course records of a year. """ result = models.ForeignKey(Result) year = models.IntegerField() ``` What I'd like is for the `YearRecord` admin to be able to search for the team which a runner belongs to. However as soon as I attempt to add the `Runner` FK relationship to the search fields I get an error on searches; `TypeError: Related Field got invalid lookup: icontains` So, here is the admin setup where I'd like to be able to search through the relationships. I'm sure this matches the docs, but am I misunderstanding something here? Can this be resolved & the `result__runner` be extended to the team field of the `Runner` model? ``` # admin.py class YearRecordAdmin(admin.ModelAdmin): model = YearRecord list_display = ('result', 'get_agegroup', 'get_team', 'year') search_fields = ['result__runner', 'year'] def get_team(self, obj): return obj.result.runner.team get_team.short_description = _("Team") def get_agegroup(self, obj): return obj.result.runner.agegroup get_agegroup.short_description = _("Age group") ```