Django，unicode对象没有属性pk

Question

我有一个验证包含ModelMultipleChoiceField的表单的问题。 在面子上提交，我有这样的错误：

Traceback (most recent call last): 
    File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 149, in get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 147, in get_response 
response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/home/Proapp/main_app/views.py", line 275, in felicitationInscription 
if completerProfilForm.is_valid() : 
    File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 161, in is_valid 
return self.is_bound and not self.errors 
    File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 153, in errors 
self.full_clean() 
    File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 362, in full_clean 
self._clean_fields() 
    File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 380, in _clean_fields 
value = field.clean(value) 
    File "/usr/local/lib/python2.7/dist-packages/django/forms/models.py", line 1254, in clean 
qs = self._check_values(value) 
    File "/usr/local/lib/python2.7/dist-packages/django/forms/models.py", line 1287, in _check_values 
pks = set(force_text(getattr(o, key)) for o in qs) 
    File "/usr/local/lib/python2.7/dist-packages/django/forms/models.py", line 1287, in <genexpr> 
pks = set(force_text(getattr(o, key)) for o in qs) 
AttributeError: 'unicode' object has no attribute 'pk' 

所以我的形式是这样的：

class inscritForm(forms.ModelForm) : 
    firstname = forms.CharField(max_length=50,widget=forms.TextInput(attrs={'class':'form-control'})) 

    class Meta : 
     model = Inscrit 
     fields = ['firstname','skills'] 

    def __init__(self, *args, **kwargs): 
     super(inscritForm, self).__init__(*args, **kwargs) 
     thedomains = Domain.objects.values_list('name',flat=True) 
     self.fields["skills"] = forms.ModelMultipleChoiceField(queryset=thedomains, widget=forms.CheckboxSelectMultiple() 
     for key, field in self.fields.iteritems(): 
      self.fields[key].required = False 

而且型号：

class Inscrit(models.Model): 
    user = models.OneToOneField(User) 
    competences = models.ManyToManyField(Speciality,related_name='specialities') 

class Domain(models.Model): 
    name = models.CharField(max_length=20,primary_key=True) 

    def __str__(self) : 
     return self.name 

    def __unicode__(self) : 
     return self.name 


@python_2_unicode_compatible 
class Speciality(models.Model): 
    domain = models.ForeignKey(Domain,null=False) 
    specificity = models.TextField(max_length=100,null=True) 

    def __str__(self): 
     return u'%s %s'%(self.domain.name, self.specificity) 

最后，我的观点验证：

我测试了域的实例是否在shell中具有属性'pk'，并且他们有...

Answer 1

由于正在使用模型多选字段，因此应该使用常规查询集而不是values()。

thedomains = Domain.objects.all() 
self.fields["skills"] = forms.ModelMultipleChoiceField(queryset=thedomains, widget=forms.CheckboxSelectMultiple())