Ticket #8687: m2m_through_regress-validation-tests.diff

tests/regressiontests/m2m_through_regress/models.py

@@ -176 +176 @@
 >>> bob.group_set.filter(membership__price=50)
 [<Group: Roll>]
 
+## Regression test for #8687 - NameError when validating m2m models.
+## This test works by creating three models, patching them onto the current
+## application (m2m_through_regress) and re-running get_validation_errors.
+
+>>> class BadPerson(models.Model):
+...    members = models.ManyToManyField('BadGroup', through='BadMembership')
+
+>>> class BadGroup(models.Model):
+...    members = models.ManyToManyField(BadPerson, through='BadMembership')
+
+>>> class BadMembership(models.Model):
+...    person = models.ForeignKey(BadPerson)
+...    person3 = models.ForeignKey(BadPerson, related_name="person3")
+...    group = models.ForeignKey(BadGroup)
+
+>>> from regressiontests import m2m_through_regress
+>>> setattr(m2m_through_regress.models, 'BadPerson', BadPerson)
+>>> setattr(m2m_through_regress.models, 'BadGroup', BadGroup)
+>>> setattr(m2m_through_regress.models, 'BadMembership', BadMembership)
+
+>>> from django.core.management.validation import get_validation_errors
+
+Something to swallow and remember errors:
+>>> class StdOut(object):
+...    def __init__(self): self.lines = []
+...    def write(self, val): self.lines.append(val.strip())
+>>> stdout = StdOut()
+
+We should get two errors, both related to BadMembership: one when
+validating BadPerson and one when validating BadGroup:
+>>> get_validation_errors(stdout) == 2
+True
+
+>>> stdout.lines
+['m2m_through_regress.badperson: Intermediary model BadMembership
+    has more than one foreign key to BadPerson, which is ambiguous
+    and is not permitted.', 'm2m_through_regress.badgroup: Intermediary
+    model BadMembership has more than one foreign key to BadPerson, which
+    is ambiguous and is not permitted.']
+
 """}