def find(github_user):
expert_name = name(github_user)
try:
return Expert.by_name(expert_name)
except Expert.DoesNotExist:
pass
expert = Expert.objects.filter(
contact_details__type="github",
contact_details__value=github_user.login
).distinct()
if len(expert) == 0:
raise Expert.DoesNotExist(expert_name)
if len(expert) != 1:
raise Expert.MultipleObjectsReturned(expert_name)
expert, = expert
return expert
