1 files changed, 42 insertions, 0 deletions
diff --git a/parts/django/tests/modeltests/delete/models.py b/parts/django/tests/modeltests/delete/models.py
new file mode 100644
index 0000000..9c81f6b
--- /dev/null
+++ b/parts/django/tests/modeltests/delete/models.py
@@ -0,0 +1,42 @@
+# coding: utf-8
+"""
+Tests for some corner cases with deleting.
+"""
+
+from django.db import models
+
+class DefaultRepr(object):
+    def __repr__(self):
+        return u"<%s: %s>" % (self.__class__.__name__, self.__dict__)
+
+class A(DefaultRepr, models.Model):
+    pass
+
+class B(DefaultRepr, models.Model):
+    a = models.ForeignKey(A)
+
+class C(DefaultRepr, models.Model):
+    b = models.ForeignKey(B)
+
+class D(DefaultRepr, models.Model):
+    c = models.ForeignKey(C)
+    a = models.ForeignKey(A)
+
+# Simplified, we have:
+# A
+# B -> A
+# C -> B
+# D -> C
+# D -> A
+
+# So, we must delete Ds first of all, then Cs then Bs then As.
+# However, if we start at As, we might find Bs first (in which
+# case things will be nice), or find Ds first.
+
+# Some mutually dependent models, but nullable
+class E(DefaultRepr, models.Model):
+    f = models.ForeignKey('F', null=True, related_name='e_rel')
+
+class F(DefaultRepr, models.Model):
+    e = models.ForeignKey(E, related_name='f_rel')
+