Ticket #13574: django_m2m_field_name_regressiontest.diff

tests/regressiontests/m2m_through_regress/models.py

@@ -52 +52 @@
     b_text = models.CharField(max_length=20)
     a_list = models.ManyToManyField(A, through=Through)
 
+# A set of models to test m2m relations using non-primary keys as foreign keys.
+class Author(models.Model):
+    name = models.CharField(max_length=50, unique=True)
+
+    def __unicode__(self):
+        return u'%s' % self.name
+
+class Book(models.Model):
+    title = models.CharField(max_length=50, unique=True)
+    authors = models.ManyToManyField(Author, through='BookToAuthor')
+
+    def __unicode__(self):
+        return u'%s' % self.title
+
+class BookToAuthor(models.Model):
+    author = models.ForeignKey(Author, db_column='author_name', to_field='name')
+    book = models.ForeignKey(Book, db_column='book_title', to_field='title')
+
+    def __unicode__(self):
+        return u'%s wrote %s' % (self.author, self.book)
 
 __test__ = {'API_TESTS':"""
 # Create some dummy data
@@ -206 +226 @@
 >>> management.call_command('dumpdata', 'm2m_through_regress', format='json')
 [{"pk": 1, "model": "m2m_through_regress.usermembership", "fields": {"price": 100, "group": 1, "user": 1}}, {"pk": 1, "model": "m2m_through_regress.person", "fields": {"name": "Guido"}}, {"pk": 1, "model": "m2m_through_regress.group", "fields": {"name": "Python Core Group"}}]
 
+
+## Regression test for #13574
+Check that m2m relations through an existing model where the foreign keys
+are using to_field generate correct sql.
+
+>>> orwell = Author.objects.create(name='George Orwell')
+>>> nnf = Book.objects.create(title='1984')
+>>> nnf_to_orwell = BookToAuthor.objects.create(author=orwell, book=nnf)
+>>> orwell.book_set.all()
+[<Book: 1984>]
+>>> nnf.authors.all()
+[<Author: George Orwell>]
+
 """}