Django-Typeエラー：期待される文字列またはバイト様オブジェクト

Question

このエラーに関する他の質問がありましたが、誰も手伝ってくれなかったので、自分で作ったと思いました。タイトルごとに、私はこのタイプのエラーを取得し続けていると私はなぜそれが発生しているとしてアイデアが不足している。

私は、フォトオブジェクトを追加するギャラリーオブジェクトを含むアプリケーションを作成しています。私が最近取り組んできたのは、.zipファイルから写真を追加するためのzip_upload関数でした。私はPhotologueを試しましたが、私は複数の理由からすべてを自分で処理することに決めました。実際には、Photologueに多くの類似点を書いているので、Photologueをたくさん引用しました。ここに私のコード（重要でない詳細を左）とトレースバックは次のとおりです。

モデル：

from django.utils.timezone import now 

class ImageModel(models.Model): 
    image = models.ImageField('image',max_length=100,upload_to='photos') 
    class Meta: 
     abstract = True 

class Photo(ImageModel): 
    title = models.CharField('title',max_length=250,unique=True) 
    date_added = models.DateTimeField('date added',default=now) 
    objects = PhotoQuerySet.as_manager() 

class Gallery(models.Model): 
    title = models.CharField('title',max_length=250,unique=True) 
    photos = models.ManyToManyField(Photo, 
      related_name='gallery',verbose_name='photos', blank=True) 
    objects = GalleryQuerySet.as_manager() 

管理ページ：

class GalleryAdmin(admin.ModelAdmin): 

    def get_urls(self): 
     urls = super(GalleryAdmin, self).get_urls() 
     add_urls = [ 
      url(r'^upload_zip/$', 
       self.admin_site.admin_view(self.upload_zip), 
       name='upload_zip') 
     ] 
     return add_urls + urls 

    def upload_zip(self,request): 
     context = { 
      'app_label': self.model._meta.app_label, 
      'opts': self.model._meta, 
     } 

     # Handle form request 
     if request.method == 'POST': 
      form = UploadZipForm(request.POST, request.FILES) 
      if form.is_valid(): 
       form.save(request=request) 
       return HttpResponseRedirect('..') 
     else: 
      form = UploadZipForm() 
     context['form'] = form 
     context['adminform'] = helpers.AdminForm(form, 
         list([(None{'fields':form.base_fields})]),{}) 
     return render(
      request,'admin/inv_app/gallery/upload_zip.html',context) 

フォーム：

class UploadZipForm(forms.Form): 
    zip_file = forms.FileField() 
    title = forms.CharField(label='Title',required=False) 
    gallery = forms.ModelChoiceField(Gallery.objects.all(), 
     label='Gallery',required=False,) 

    # left out methods that check if zip_file is valid and titles have 
    # not been used by other Gallery objects 

    def save(self, request=None, zip_file=None): 
    if not zip_file: 
     zip_file = self.cleaned_data['zip_file'] 
     zip = zipfile.ZipFile(zip_file,'r') 
     count = 1 
     if self.cleaned_data['gallery']: 
      logger.debug('Using pre-existing gallery.') 
      gallery = self.cleaned_data['gallery'] 
     else: 
      logger.debug(
      force_text('Creating new gallery "{0}".') 
       .format(self.cleaned_data['title'])) 
      gallery = Gallery.objects.create(
      title=self.cleaned_data['title'], 
      slug=slugify(self.cleaned_data['title']),) 
     found_image = False 
    for filename in sorted(zip.namelist()): 
     _, file_extension = os.path.splitext(filename) 
     file_extension = file_extension.lower() 
     if not file_extension or file_extension != '.jpg': 
      continue 
     # check file is not subfolder 

     data = zip.read(filename) 

     # check file is not empty, assign title to photo 

     contentfile = ContentFile(data) 
     photo.image.save(filename, contentfile) 
     # I believe the error is produced here^
     photo.save() 
     gallery.photos.add(photo) 
    zip.close() 

トレースバック：

File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response 
    response = self.process_exception_by_middleware(e, request) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapped_view 
    response = view_func(request, *args, **kwargs) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/views/decorators/cache.py" in _wrapped_view_func 
    response = view_func(request, *args, **kwargs) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/contrib/admin/sites.py" in inner 
    return view(request, *args, **kwargs) 
File "/Users/Lucas/Documents/inventory-master/inv_app/admin.py" in upload_zip 
    form.save(request=request) 
File "/Users/Lucas/Documents/inventory-master/inv_app/forms.py" in save 
    photo.image.save(filename, contentfile) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/fields/files.py" in save 
    self.instance.save() 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/base.py" in save 
    force_update=force_update, update_fields=update_fields) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/base.py" in save_base 
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/base.py" in _save_table 
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/base.py" in _do_insert 
    using=using, raw=raw) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/manager.py" in manager_method 
    return getattr(self.get_queryset(), name)(*args, **kwargs) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/query.py" in _insert 
    return query.get_compiler(using=using).execute_sql(return_id) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/sql/compiler.py" in execute_sql 
    for sql, params in self.as_sql(): 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/sql/compiler.py" in as_sql 
    for obj in self.query.objs 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/sql/compiler.py" in <listcomp> 
    for obj in self.query.objs 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/sql/compiler.py" in <listcomp> 
    [self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields] 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/sql/compiler.py" in prepare_value 
    value = field.get_db_prep_save(value, connection=self.connection) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/fields/__init__.py" in get_db_prep_save 
    prepared=False) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/fields/__init__.py" in get_db_prep_value 
    value = self.get_prep_value(value) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/fields/__init__.py" in get_prep_value 
    value = super(DateTimeField, self).get_prep_value(value) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/fields/__init__.py" in get_prep_value 
    return self.to_python(value) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/db/models/fields/__init__.py" in to_python 
    parsed = parse_datetime(value) 
File "/Users/Lucas/Documents/python_envs/inventory/lib/python3.5/site-packages/django/utils/dateparse.py" in parse_datetime 
    match = datetime_re.match(value) 

Exception Type: TypeError at /admin/inv_app/gallery/upload_zip/ 
Exception Value: expected string or bytes-like object 

私はウェブ開発者にとっては比較的新しいので、私は何かが紛れているか、または明らかでないと確信しています。助けてください！

Answer 1

私は自分で解決することができました。

私の問題は、私は写真のモデルのsaveメソッドをオーバーライドた方法だった：それはとても適切に保存し、それはバグを修正し削除していなかったいくつかの理由

def save(self, *args, **kwargs): 
    if self.slug is None: 
     self.slug = slugify(self.title) 
    super(Photo, self).save(*args, **kwargs) 

とそれが今すべきように動作します。私はそれを置き換える必要はないので、私はそれを上書きする必要はないと思った！私はオリジナルの質問にモデルのこの部分を掲載していないことを認識しています。投稿する前にエラーを完全に理解しようとしていないのは間違いです。