我正在使用自定义Django模型字段和widget来在我的管理员中呈现GoogleMap小部件,我还想使用South和我的项目来处理数据库迁移。然而,经过多方努力,我无法生成适合的自定义南方规则,这是我的自定义模型和我尝试过的许多自我规则中的最后一条。
class GoogleMapMarkerField(models.CharField):
__metaclass__ = models.SubfieldBase
description = _('Un marcador de Google Maps')
widget = GoogleMapMarkerWidget
def __init__(self, center, *args, **kwargs):
kwargs['max_length'] = 100
kwargs['help_text'] = _('Arrastre el cursor en el mapa para seleccionar el punto')
self.center = center
super(GoogleMapMarkerField, self).__init__(*args, **kwargs)
def formfield(self, **kwargs):
defaults = {
'center': self.center,
'form_class':GoogleMapMarkerFormField
}
defaults.update(kwargs)
return super(GoogleMapMarkerField, self).formfield(**defaults)
def to_python(self, value):
if isinstance(value, GoogleMapMarker):
return value
if isinstance(value, list):
return GoogleMapMarker(*map(float, value))
elif isinstance(value, basestring):
try:
return GoogleMapMarker(*map(float, value.split(',')))
except ValueError:
pass
def get_prep_value(self, value):
return '%f,%f' % (value.latitude, value.longitude)
add_introspection_rules([
(
(GoogleMapMarkerField, ),
[],
{
'center': ('center', {}),
}
)
], ["^website\.fields\.GoogleMapMarkerField"])
这是我得到的追溯
Traceback (most recent call last):
File "manage.py", line 14, in <module>
execute_manager(settings)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 438, in execute_manager
utility.execute()
File "/home/armonge/workspace/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 379, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/django/core/management/base.py", line 191, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/django/core/management/base.py", line 220, in execute
output = self.handle(*args, **options)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/south/management/commands/schemamigration.py", line 97, in handle
old_orm = last_migration.orm(),
File "/home/armonge/workspace/env/lib/python2.7/site-packages/south/utils.py", line 62, in method
value = function(self)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/south/migration/base.py", line 422, in orm
return FakeORM(self.migration_class(), self.app_label())
File "/home/armonge/workspace/env/lib/python2.7/site-packages/south/orm.py", line 46, in FakeORM
_orm_cache[args] = _FakeORM(*args)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/south/orm.py", line 125, in __init__
self.models[name] = self.make_model(app_label, model_name, data)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/south/orm.py", line 321, in make_model
field = self.eval_in_context(code, app, extra_imports)
File "/home/armonge/workspace/env/lib/python2.7/site-packages/south/orm.py", line 236, in eval_in_context
return eval(code, globals(), fake_locals)
File "<string>", line 1, in <module>
TypeError: __init__() takes at least 2 arguments (1 given)
答案 0 :(得分:1)
center
不是关键字参数,它是位置参数。你不应该使用位置参数与南方,它不理解它们。 (见Custom Fields: Keyword Arguments)。您可以通过向中心提供默认值(center=None
就可以了)来解决这个问题,然后按照链接上的示例代码来定义传递给__init__
的关键字名称,该名称存储在数据库和选项字典(可能是空白,但在那里设置默认值也有帮助)。