如何使用鏈接表中的字段作爲django-crispy-forms中的字段？

Question

我有兩個通過ForiegnKey鏈接的模型，並且我希望使用django-crispy-forms將PhoneNumber模型中的字段用於我的表單。

我試過的是使用語法'phone_number__number'，但只給了我一個空的下拉列表的形式。

這裏是我的模型，用一切，但取出的客戶模型爲這個職位PHONE_NUMBER：

class Customer(models.Model): 
    phone_number = models.ForeignKey(PhoneNumber) 

class PhoneNumber(models.Model): 
    TYPES = (
     ('Cell', 'Cell'), 
     ('Home', 'Home'), 
     ('Fax', 'Fax'), 
     ('Work', 'Work'), 
) 
    primary = models.BooleanField(default=False) 
    phone_type = models.CharField(max_length=30, choices=TYPES, default='Cell') 
    number = models.CharField(max_length=15) 

我的形式，只有PHONE_NUMBER領域：

class CustomerCreateForm(forms.ModelForm): 
''' 
Base form for creating customers 
''' 
def __init__(self, *args, **kwargs): 
    self.helper = FormHelper() 
    self.helper.layout = Layout(
     Fieldset(
      'Personal Information', 
      'phone_number__number', 
     ), 
     FormActions(
      Submit('submit' , 'Submit' , css_class='btn btn-success'), 
      Button('cancel' , 'Cancel' , css_class='btn btn-warning', onclick='javascript:history.go(-1);'), 
     ) 
    ) 
    super(CustomerCreateForm, self).__init__(*args, **kwargs) 

class Meta: 
    model = Customer 
    exclude = (
     'create_user', 
     'modify_user' 
    ) 

Answer 1

from yourapp.models import PhoneNumber  

class CustomerCreateForm(forms.ModelForm): 
    ''' 
    Base form for creating customers 
    ''' 
    def __init__(self, *args, **kwargs): 
     self.helper = FormHelper() 
     self.helper.layout = Layout(
      Fieldset(
       'Personal Information', 
       'phone_number', 
      ), 
     FormActions(
      Submit('submit' , 'Submit' , css_class='btn btn-success'), 
      Button('cancel' , 'Cancel' , css_class='btn btn-warning', 
        onclick='javascript:history.go(-1);'), 
      ) 
     ) 
     super(CustomerCreateForm, self).__init__(*args, **kwargs) 
     self.fields["phone_number"].choices = \ 
     [(item.number, item.number) for item in PhoneNumber.objects.all()] 

     class Meta: 
      model = Customer 
      exclude = (
       'create_user', 
       'modify_user' 
      )