Error: 'NoneType' object has no attribute 'strip'

[Danish Ali]

Hello,

I am getting this error: Error: 'NoneType' object has no attribute 'strip'

I have created a model and I am trying to autofill slug field in it. When I save the record in database I get this error: Error: 'NoneType' object has no attribute 'strip'

My model is:

from django.db import models

from autoslug import AutoSlugField

# Create your models here.

class Shop(models.Model):

    name = models.CharField(max_length=200)

    image = models.CharField(max_length=200)

    description = models.TextField()

    slug = models.SlugField(null=True, blank=True)

    slug = AutoSlugField(populate_from='name')

If I remove: slug = AutoSlugField(populate_from='name') then it works fine. So, can someone tell me what is the issue here?

Thanks 

[Kelvin Wong]

Comment out the earlier slug field. What happens?

# slug = models.SlugField(null=True, blank=True)

K

[Danish Ali]

still same error.

[Jani Tiainen]

How are you trying to set data and trying to save to database (used commands would be helpful)

--

Jani Tiainen

[Danish Ali]

I am using admin to enter data.

This is the URL from where I am trying to save records: http://127.0.0.1:8000/admin/product/shop/add/

[Vijay Khemlani]

Have you tried following the stacktrace that resulted in the error? 

Does it fail when trying to strip the contents of the "name" field?

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[Kelvin Wong]

Post the full trace. I looked at the source for auto slug field and they don't use strip, so the source of this error must be somewhere else. You are looking for code like this:

slug = None

slug.strip()

K

[Danish Ali]

I think it fails when it tries to stip content of name. Should I paste stacktrace here. Because I do not get any clue from stacktrace about the problem :/

[Jani Tiainen]

On Mon, 1 Dec 2014 10:20:24 -0300
Vijay Khemlani <vkhe...@gmail.com> wrote:

> Have you tried following the stacktrace that resulted in the error?
>
> Does it fail when trying to strip the contents of the "name" field?
>

Or maybe that library where field AutoSlug comes from isn't compatible
with your version of Django?

--

Jani Tiainen

[Danish Ali]

I am not sure about that. 

is there any other easy way to get autofill slug then :)

[Danish Ali]

can someone help please ?

[Mike Dewhirst]

On 3/12/2014 1:58 AM, Danish Ali wrote:
> can someone help please ?

I haven't been watching this thread but I just solved a similar problem
with 'NoneType is not iterable'

My problem was fixed when I ensured the functions involved got passed a
type they were expecting.

I'm guessing you should work around the problem by avoiding autofill for
the moment and slugify in the model.save method.

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[Danish Ali]

I also used this method. But I got same error in this method too.

def save(self, *args, **kwargs):

    self.slug = slugify(self.name)

    super(Shop, self).save(*args, **kwargs)

Please let me know if this is correct or not. 

[Babatunde Akinyanmi]

At this point i think it will be good to paste the stacktrace here

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[Danish Ali]

this is stacktrace when I use: slug = AutoSlugField(populate_from='name') in my model

Environment:

Request Method: POST

Request URL: http://127.0.0.1:8000/admin/product/shop/add/

Django Version: 1.7.1

Python Version: 3.4.2

Installed Applications:

('django.contrib.admin',

 'django.contrib.auth',

 'django.contrib.contenttypes',

 'django.contrib.sessions',

 'django.contrib.messages',

 'django.contrib.staticfiles',

 'product')

Installed Middleware:

('django.contrib.sessions.middleware.SessionMiddleware',

 'django.middleware.common.CommonMiddleware',

 'django.middleware.csrf.CsrfViewMiddleware',

 'django.contrib.auth.middleware.AuthenticationMiddleware',

 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',

 'django.contrib.messages.middleware.MessageMiddleware',

 'django.middleware.clickjacking.XFrameOptionsMiddleware')

Traceback:

File "e:\python\lib\site-packages\django\core\handlers\base.py" in get_response

  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "e:\python\lib\site-packages\django\contrib\admin\options.py" in wrapper

  584.                 return self.admin_site.admin_view(view)(*args, **kwargs)

File "e:\python\lib\site-packages\django\utils\decorators.py" in _wrapped_view

  105.                     response = view_func(request, *args, **kwargs)

File "e:\python\lib\site-packages\django\views\decorators\cache.py" in _wrapped_view_func

  52.         response = view_func(request, *args, **kwargs)

File "e:\python\lib\site-packages\django\contrib\admin\sites.py" in inner

  204.             return view(request, *args, **kwargs)

File "e:\python\lib\site-packages\django\contrib\admin\options.py" in add_view

  1454.         return self.changeform_view(request, None, form_url, extra_context)

File "e:\python\lib\site-packages\django\utils\decorators.py" in _wrapper

  29.             return bound_func(*args, **kwargs)

File "e:\python\lib\site-packages\django\utils\decorators.py" in _wrapped_view

  105.                     response = view_func(request, *args, **kwargs)

File "e:\python\lib\site-packages\django\utils\decorators.py" in bound_func

  25.                 return func.__get__(self, type(self))(*args2, **kwargs2)

File "e:\python\lib\site-packages\django\db\transaction.py" in inner

  394.                 return func(*args, **kwargs)

File "e:\python\lib\site-packages\django\contrib\admin\options.py" in changeform_view

  1405.                 self.save_model(request, new_object, form, not add)

File "e:\python\lib\site-packages\django\contrib\admin\options.py" in save_model

  1046.         obj.save()

File "e:\python\lib\site-packages\django\db\models\base.py" in save

  591.                        force_update=force_update, update_fields=update_fields)

File "e:\python\lib\site-packages\django\db\models\base.py" in save_base

  619.             updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)

File "e:\python\lib\site-packages\django\db\models\base.py" in _save_table

  700.             result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)

File "e:\python\lib\site-packages\django\db\models\base.py" in _do_insert

  733.                                using=using, raw=raw)

File "e:\python\lib\site-packages\django\db\models\manager.py" in manager_method

  92.                 return getattr(self.get_queryset(), name)(*args, **kwargs)

File "e:\python\lib\site-packages\django\db\models\query.py" in _insert

  921.         return query.get_compiler(using=using).execute_sql(return_id)

File "e:\python\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql

  920.                 cursor.execute(sql, params)

File "e:\python\lib\site-packages\django\db\backends\utils.py" in execute

  85.             sql = self.db.ops.last_executed_query(self.cursor, sql, params)

File "e:\python\lib\site-packages\mysql\connector\django\base.py" in last_executed_query

  371.         return cursor.statement

File "e:\python\lib\site-packages\mysql\connector\django\base.py" in __getattr__

  147.         return getattr(self.cursor, attr)

File "e:\python\lib\site-packages\mysql\connector\cursor.py" in statement

  858.             return self._executed.strip()

Exception Type: AttributeError at /admin/product/shop/add/

Exception Value: 'NoneType' object has no attribute 'strip'

[donarb]

Looks like a bug in MySQL/connector (although it could just be a symptom of doing the same thing in Django as the bug poster):

https://bugs.mysql.com/bug.php?id=74675

[Danish Ali]

so is there anyway to create slug automatically other than this ?

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Regards,

Danish Ali

[Collin Anderson]

Hi,

If you remove all the slug code do you still get this error? If so, then the error has nothing to do with automatically creating a slug.

Try expanding Local vars to see what "params" and "sql are.

File "e:\python\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
  920.                 cursor.execute(sql, params)
File "e:\python\lib\site-packages\django\db\backends\utils.py" in execute
  85.             sql = self.db.ops.last_executed_query(self.cursor, sql, params)

This does seem like a bug in mysql-connector. You may want to bring it up on the mysql-connector list. http://forums.mysql.com/list.php?50

You could also try using mysqlclient instead to see if you still have the problem. That's django's recommended connector.

https://pypi.python.org/pypi/mysqlclient

https://docs.djangoproject.com/en/dev/ref/databases/#mysql-db-api-drivers

Collin

[Danish Ali]

If I remove slug code, then everything works fine. 

And can you tell me how can I expand the variables?

Thanks 

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Regards,

Danish Ali

[Collin Anderson]

Hi,

Does this work? (What you've already tried, but not using autoslug at all.)

from django.utils.text import slugify

    slug = models.SlugField(null=True, blank=True)

    def save(self, *args, **kwargs):

        self.slug = slugify(self.name or '')

        super(Shop, self).save(*args, **kwargs)

If you have a "pretty" django traceback, you can click to expand where it says "▶ Local vars".

Collin

[Danish Ali]

No. It also did not work. It was also giving similar error.

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Regards,

Danish Ali

[Collin Anderson]

Hi,

Looking at your traceback, it doesn't look like it's calling your custom save() method. Do your current tracebacks show your custom save method?

You could try print(vars(self)) right before saving to see if there is a None that shouldn't be there.

Again, if the traceback is happening in the browser, see if you can figure out what's in the "params" dict by clicking "local vars".

Collin