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diff --git a/lib/python2.7/site-packages/south/v2.py b/lib/python2.7/site-packages/south/v2.py
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+"""
+API versioning file; we can tell what kind of migrations things are
+by what class they inherit from (if none, it's a v1).
+"""
+
+from south.utils import ask_for_it_by_name
+
+class BaseMigration(object):
+
+ def gf(self, field_name):
+ "Gets a field by absolute reference."
+ field = ask_for_it_by_name(field_name)
+ field.model = FakeModel
+ return field
+
+class SchemaMigration(BaseMigration):
+ pass
+
+class DataMigration(BaseMigration):
+ # Data migrations shouldn't be dry-run
+ no_dry_run = True
+
+class FakeModel(object):
+ "Fake model so error messages on fields don't explode"
+ pass