Django hangs up when select_related() on cross-related models

Oh, problem is slightly more complicated. In example above everything is ok.

Try this:

class X(models.Model):
    y = models.ForeignKey('Y')

class Y(models.Model):
    x1 = models.ForeignKey(X, related_name="y2")
    x2 = models.ManyToManyField(X, related_name="y3")

... and now:

>>> from avatar.models import X
>>> X.objects.all()
[]
>>> X.objects.select_related()

... and we just created a infinite recursion...

In addition, there is probably a bug somewhere in exception handling in db wrapper, in contrib.admin or maybe in development server? I don't know. I told recently, that Django hangs up, but we saw, that it throw runtime exception only. This is because I recently executed my example in auto-admin site - if we'll add Admin class to model X:

    class Admin:
        list_select_related = True

... and we'll try to get a list of objects X, we'll hangs up server (I tested it only on development server borrowed with Django).

I'm closing this in favour of #3288. Both have similar conditions, and the tracebacks look the same. #3288 is easier to understand and thus probably better suited to hunt the bug.

dup of #2549 too. #3288 is a specific case (X with FK to X).

(In [6521]) queryset-refactor: Fixed a possibility of shooting oneself in the foot and creating infinite recursion with select_related(). Refs #3045, #3288.