What is the related_name argument useful for on ManyToManyField and ForeignKey fields? For example, given the following code, what is the effect of related_name='maps'?
class Map(db.Model):
members = models.ManyToManyField(User, related_name='maps',
verbose_name=_('members'))
The related_name attribute specifies the name of the reverse relation from the User model back to your model.
If you don't specify a related_name, Django automatically creates one using the name of your model with the suffix _set, for instance User.map_set.all().
If you do specify, e.g. related_name=maps on the User model, User.map_set will still work, but the User.maps. syntax is obviously a bit cleaner and less clunky; so for example, if you had a user object current_user, you could use current_user.maps.all() to get all instances of your Map model that have a relation to current_user.
The Django documentation has more details.
To disable creating the backwards relationship entirely, set related_name to "+".