模型認爲我的字符串是元組，並不會保存

Question

我有一個模型，我試圖重寫保存，但是當我通過它認爲該字符串是一個元組的信息，並不會保存信息該模型。我正在使用的特定字段是單行地址，如下所示：3107 Eric Motorway, Lake William, GU 71954，但我的模型認爲逗號是一個元組。我試過把它轉換成一個字符串和一切。

Models.py：

class AddressBook(models.Model): 
    address = models.CharField(max_length=250, unique=True) 
    name = models.CharField(max_length=250) 

    def __str__(self): 
     return self.address 


class Freight(models.Model): 
    pu_location = models.OneToOneField(AddressBook, to_field='address', related_name='pu_location') 
    pu_customer = models.CharField(max_length=200) 
    pu_appt_time = models.DateTimeField(default=datetime.now) 
    po_number = models.CharField(max_length=20) 
    load_number = models.CharField(max_length=10, blank=True, null=True) 
    pallet_count = models.IntegerField(validators=[MaxValueValidator(999)]) 
    content_type = models.CharField(max_length=20, choices=[('Frozen', 'Frozen'), ('Chilled', 'Chilled'), ('Dry', 'Dry')]) 
    cases_count = models.IntegerField(validators=[MaxValueValidator(9999)]) 
    weight = models.IntegerField(validators=[MaxValueValidator(99999)]) 
    del_customer = models.CharField(max_length=200) 
    del_location = models.OneToOneField(AddressBook, to_field='address', related_name='del_location') 
    del_city = models.CharField(max_length=50, blank=True, null=True) 
    del_state = models.CharField(max_length=2, blank=True, null=True) 
    del_appt_time = models.DateTimeField(default=datetime.now) 
    invoice_amount = models.FloatField(default=0.00, validators=[MinValueValidator(0.00), MaxValueValidator(999999.00)]) 

    def save(self, *args, **kwargs): 
     reg = re.compile(r',+?(?P<city>[^,]+),\s+(?P<state>[A-Za-z]{2})') 
     print(self.del_location) 
     extract = reg.search(self.del_location) 
     city = extract.group('city') 
     state = extract.group('state') 
     if not self.del_state: 
      self.del_city = city 
     if not self.del_city: 
      self.del_state = state 

    def __str__(self): 
     return self.po_number, self.pu_customer, self.del_location 

回溯信息：

Environment: 


Request Method: POST 
Request URL: http://127.0.0.1:8000/admin/dispatch/freight/add/ 

Django Version: 1.11.2 
Python Version: 3.6.1 
Installed Applications: 
['django.contrib.admin', 
'django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.messages', 
'django.contrib.staticfiles', 
'django.contrib.sites', 
'imagekit', 
'rolepermissions', 
'django_messages', 
'taggit', 
'dispatch'] 
Installed Middleware: 
['django.middleware.security.SecurityMiddleware', 
'django.contrib.sessions.middleware.SessionMiddleware', 
'django.middleware.common.CommonMiddleware', 
'django.middleware.csrf.CsrfViewMiddleware', 
'django.contrib.auth.middleware.AuthenticationMiddleware', 
'django.contrib.messages.middleware.MessageMiddleware', 
'django.middleware.clickjacking.XFrameOptionsMiddleware', 
'dispatch.activeuser_middleware.ActiveUserMiddleware'] 



Traceback: 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner 
    41.    response = get_response(request) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response 
    187.     response = self.process_exception_by_middleware(e, request) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response 
    185.     response = wrapped_callback(request, *callback_args, **callback_kwargs) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/contrib/admin/options.py" in wrapper 
    551.     return self.admin_site.admin_view(view)(*args, **kwargs) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/utils/decorators.py" in _wrapped_view 
    149.      response = view_func(request, *args, **kwargs) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/views/decorators/cache.py" in _wrapped_view_func 
    57.   response = view_func(request, *args, **kwargs) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/contrib/admin/sites.py" in inner 
    224.    return view(request, *args, **kwargs) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/contrib/admin/options.py" in add_view 
    1508.   return self.changeform_view(request, None, form_url, extra_context) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/utils/decorators.py" in _wrapper 
    67.    return bound_func(*args, **kwargs) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/utils/decorators.py" in _wrapped_view 
    149.      response = view_func(request, *args, **kwargs) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/utils/decorators.py" in bound_func 
    63.     return func.__get__(self, type(self))(*args2, **kwargs2) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/contrib/admin/options.py" in changeform_view 
    1408.    return self._changeform_view(request, object_id, form_url, extra_context) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/contrib/admin/options.py" in _changeform_view 
    1452.      self.log_addition(request, new_object, change_message) 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/contrib/admin/options.py" in log_addition 
    724.    object_repr=force_text(object), 

File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/django/utils/encoding.py" in force_text 
    76.      s = six.text_type(s) 

Exception Type: TypeError at /admin/dispatch/freight/add/ 
Exception Value: __str__ returned non-string (type tuple) 

Answer 1

你__str__是一個元組。您的版本：

def __str__(self): 
    return self.po_number, self.pu_customer, self.del_location 

你可以嘗試像

def __str__(self): 
    return "%s %s %s" % (self.po_number, self.pu_customer, self.del_location) 

，它應該只是罰款:)