Ich wechsle zu Django 1.7. Wenn ich Makemigrationen für meine Anwendung versuche, stürzt es ab. Der Crash-Bericht ist:Django 1.7 makemigrations - ValueError: Kann nicht serialisieren Funktion: Lambda
Migrations for 'roadmaps':
0001_initial.py:
- Create model DataQualityIssue
- Create model MonthlyChange
- Create model Product
- Create model ProductGroup
- Create model RecomendedStack
- Create model RecomendedStackMembership
- Create model RoadmapMarket
- Create model RoadmapUser
- Create model RoadmapVendor
- Create model SpecialEvent
- Create model TimelineEvent
- Create model UserStack
- Create model UserStackMembership
- Add field products to userstack
- Add field viewers to userstack
- Add field products to recomendedstack
- Add field product_group to product
- Add field vendor to product
- Add field product to dataqualityissue
Traceback (most recent call last):
File "manage.py", line 29, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/makemigrations.py", line 124, in handle
self.write_migration_files(changes)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/makemigrations.py", line 152, in write_migration_files
migration_string = writer.as_string()
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/writer.py", line 129, in as_string
operation_string, operation_imports = OperationWriter(operation).serialize()
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/writer.py", line 80, in serialize
arg_string, arg_imports = MigrationWriter.serialize(item)
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/writer.py", line 245, in serialize
item_string, item_imports = cls.serialize(item)
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/writer.py", line 310, in serialize
return cls.serialize_deconstructed(path, args, kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/writer.py", line 221, in serialize_deconstructed
arg_string, arg_imports = cls.serialize(arg)
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/writer.py", line 323, in serialize
raise ValueError("Cannot serialize function: lambda")
ValueError: Cannot serialize function: lambda
ich eine Notiz, dass hier https://code.djangoproject.com/ticket/22892
Es gibt auch eine Verknüpfung zu Dokumentation https://docs.djangoproject.com/en/dev/topics/migrations/#serializing-values
Aber es macht es für mich nicht klarer. Die Fehlermeldung hat mir keine Ahnung gegeben, wo ich nach dem Problem suchen sollte.
Gibt es einen Weg, wie man erkennt, welche Linie genau das Problem verursacht?
Irgendwelche Hinweise?
Wie sieht Ihr Feld 'Product.dataqualityissue' aus? – Alasdair
@Alasdair Es ist 'Produkt = models.ForeignKey (Produkt, leer = True, null = True)' – matousc
OK, dieses Feld sieht gut aus. Verwenden Sie Lambda-Funktionen im Produktmodell oder in einem Ihrer anderen Modelle? – Alasdair