- Author:
- haileris23
- Posted:
- February 4, 2010
- Language:
- Python
- Version:
- 1.1
- Score:
- 2 (after 2 ratings)
This is some (probably) pretty dodgy code that allows for foreign keys in the admin's list_filter without using a custom FilterSpec. It overrides the django.db.models.options.Options get_field class to handle spanned relationships, i.e. list_filter=('houseroomtown',) as seen in http://code.djangoproject.com/ticket/3400
I have only tested this with a double foreign key relationship('house__room'), and it worked. It hasn't been tested in production, and the troubling part of this code is probably to use of 'deepcopy'. I do add those copies back to the options instance, so there shouldn't be too much runaway copying.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | from django.db.models.fields import FieldDoesNotExist
import copy
from django.db.models.fields.related import ForeignKey
def get_field(self, name, many_to_many=True):
"""
Returns the requested field by name. Raises FieldDoesNotExist on error.
"""
to_search = many_to_many and (self.fields + self.many_to_many) or self.fields
if hasattr(self, '_copy_fields'):
to_search += self._copy_fields
for f in to_search:
if f.name == name:
return f
if not name.startswith('__') and '__' in name:
f = None
model = self
path = name.split('__')
for field_name in path:
f = model._get_field(field_name)
if isinstance(f, ForeignKey):
model = f.rel.to._meta
f = copy.deepcopy(f)
f.name = name
if not hasattr(self, "_copy_fields"):
self._copy_fields = list()
self._copy_fields.append(f)
return f
raise FieldDoesNotExist, '%s has no field named %r' % (self.object_name, name)
setattr(options.Options, '_get_field', options.Options.get_field.im_func)
setattr(options.Options, 'get_field', get_field)
|
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Comments
I have problems in the setattr. Where i should put that? In my class Model, doesn´t recognize options. Thanks
#
I put the setattr call in the admin.py for my app.
#
I think he means that you get the error 'name 'options' is not defined'
Is there a missing 'from django.db.models import options'?
#
Sorry, yes that import should be there so that options will be recognized
#
i don't really understand how to use it. who calls get_field?
#
how i can use it? in admin.py how i can use it as field?
#
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