Django: ForeignKey limit_choices_to cho khách hàng của đối tượng hiện tại bằng

Question

Với hai mô hình này, tôi muốn FK url của tôi (trong ClientKeyword) chỉ hiển thị các url có trình khách bằng ứng dụng ClientKeyword hiện tại.

Tôi nên đặt gì trong limit_choices_to?

Ngay bây giờ nó trông như thế này:

class ClientUrl(models.Model): 
    client = models.ForeignKey(UpstreamClientModel) 
    url = models.URLField(unique=True, null=False) 
    active = models.BooleanField(default=True) 

def __unicode__(self): 
    return self.url 

class Meta: 
    verbose_name = 'url' 


KEYWORD_TYPES = (
    ('MN', 'Money'), 
    ('BR', 'Brand'), 
    ('LT', 'Long Tail'), 
) 

class ClientKeyword(models.Model): 
    client = models.ForeignKey(UpstreamClientModel) 
    kw_type = models.CharField("keyword type", max_length=2, 
       choices=KEYWORD_TYPES, default='LT') 
    keyword = models.CharField(max_length=150, unique=True) 
    # TODO: keyword parent ManyToManyField("self") 
    url = models.ForeignKey(ClientUrl, limit_choices_to={'client': client}) 

tôi có thể làm công nhập cư và django không phàn nàn, nhưng khi tôi cố gắng thêm một từ khóa mới tạo ra giao diện quản trị tôi nhận được traceback sau:

File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 
    111.       response = callback(request, *callback_args, **callback_kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/contrib/admin/options.py" in wrapper 
    366.     return self.admin_site.admin_view(view)(*args, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view 
    91.      response = view_func(request, *args, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func 
    89.   response = view_func(request, *args, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner 
    196.    return view(request, *args, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper 
    25.    return bound_func(*args, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view 
    91.      response = view_func(request, *args, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func 
    21.     return func(self, *args2, **kwargs2) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/transaction.py" in inner 
    209.     return func(*args, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/contrib/admin/options.py" in add_view 
    932.   ModelForm = self.get_form(request) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/contrib/admin/options.py" in get_form 
    459.   return modelform_factory(self.model, **defaults) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/forms/models.py" in modelform_factory 
    407.  return form_metaclass(class_name, (form,), form_class_attrs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/forms/models.py" in __new__ 
    206.          opts.exclude, opts.widgets, formfield_callback) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/forms/models.py" in fields_for_model 
    164.    formfield = formfield_callback(f, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/contrib/admin/options.py" in formfield_for_dbfield 
    107.     formfield = self.formfield_for_foreignkey(db_field, request, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/contrib/admin/options.py" in formfield_for_foreignkey 
    168.   return db_field.formfield(**kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/fields/related.py" in formfield 
    1005.    'queryset': self.rel.to._default_manager.using(db).complex_filter(self.rel.limit_choices_to), 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/query.py" in complex_filter 
    660.    return self._filter_or_exclude(None, **filter_obj) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/query.py" in _filter_or_exclude 
    642.    clone.query.add_q(Q(*args, **kwargs)) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/sql/query.py" in add_q 
    1250.        can_reuse=used_aliases, force_having=force_having) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/sql/query.py" in add_filter 
    1185.     connector) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/sql/where.py" in add 
    69.    value = obj.prepare(lookup_type, value) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/sql/where.py" in prepare 
    320.    return self.field.get_prep_lookup(lookup_type, value) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/fields/related.py" in get_prep_lookup 
    137.    return self._pk_trace(value, 'get_prep_lookup', lookup_type) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/fields/related.py" in _pk_trace 
    210.   v = getattr(field, prep_func)(lookup_type, v, **kwargs) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/fields/__init__.py" in get_prep_lookup 
    310.    return self.get_prep_value(value) 
File "/Users/mirkocrocop/.virtualenvs/upstream_backend/lib/python2.7/site-packages/django/db/models/fields/__init__.py" in get_prep_value 
    537.   return int(value) 

Exception Type: TypeError at /admin/clients/clientkeyword/add/ 
Exception Value: int() argument must be a string or a number, not 'ForeignKey' 

Answer 1

Thậm chí tốt hơn: cách "official" nhiều hơn để thực hiện việc này là ghi đè formfield_for_foreignkey() trong lớp quản trị của mô hình của bạn.

class ClientKeywordAdmin(admin.ModelAdmin): 
    def get_form(self, request, obj=None, **kwargs): 
     # store the model instance for later 
     request.obj = obj 
     return super(ClientKeywordAdmin, self).get_form(request, obj, 
                 **kwargs) 

    def formfield_for_foreignkey(self, db_field, request=None, **kwargs): 
     if db_field.name == 'url': 
      # set the query set to whatever you like 
      kwargs['queryset'] = request._obj.client.clienturls.all() 
     return super(ClientKeywordAdmin, 
        self).formfield_for_foreignkey(request, obj, **kwargs)