Django：在views.py中創建一個空文件

Question

我想創建一個與我創建的對象同名的新文件。 我想在數據庫中創建一個名稱為str的新“結構對象”，同時在指定的上載文件夾中創建一個名為str的新文件。 當我這樣做時，我得到'file' object has no attribute '_committed'的AttributeError 'file' object has no attribute '_committed'這是我的代碼：

views.py：

def create(request):
    print request.POST
    filename = request.POST['name'] 
    f = open(filename, "w")
    structure = Structure(name=request.POST['name'], file=f)
    structure.save()
    return redirect('/structures')

models.py：

class Structure(models.Model):
    name = models.CharField(max_length=120)
    file = models.FileField(upload_to='structures')
    created_at = models.DateTimeField(auto_now_add = True)
    updated_at = models.DateTimeField(auto_now = True)

    def __str__(self):
        return self.name

url(r'^create$', views.create),

模板：

<div class="col-md-12">
    <div class="panel panel-primary">
        <div class="panel-heading">
            <h3 class="panel-title">Créer une nouvelle structure</h3>
        </div>
        <div class="panel-body">
        <form class="form-horizontal" action="/create", method="post">
        {% csrf_token %}
          <fieldset>
            <div class="form-group">
              <label for="name" class="col-lg-6 control-label">Nom de la structure</label>
              <div class="col-lg-6">
                <input type="text" name="name" id="name">
              </div>
            </div>
            <div class="form-group">
              <div class="col-lg-10 col-lg-offset-2" align="center">
                <button type="submit" value="Create" class="btn btn-primary">Créer</button>
              </div>
            </div>
          </fieldset>
        </form>
        </div>
    </div>
</div>

在我將文件添加到views.py中創建行之前，代碼工作得很好。

這是我收到的錯誤的屏幕截圖：

Environment:


Request Method: POST
Request URL: http://localhost:8000/create

Django Version: 1.8
Python Version: 2.7.13
Installed Applications:
('apps.structure',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles')
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',
 'django.middleware.security.SecurityMiddleware')


Traceback:
File "/home/kaiss/.local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/kaiss/Documents/proj/apps/structure/views.py" in create
  27.   structure.save()
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/base.py" in save
  710.                        force_update=force_update, update_fields=update_fields)
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/base.py" in save_base
  738.             updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/base.py" in _save_table
  822.             result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/base.py" in _do_insert
  861.                                using=using, raw=raw)
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/manager.py" in manager_method
  127.                 return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/query.py" in _insert
  920.         return query.get_compiler(using=using).execute_sql(return_id)
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
  962.             for sql, params in self.as_sql():
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in as_sql
  920.                 for obj in self.query.objs
File "/home/kaiss/.local/lib/python2.7/site-packages/django/db/models/fields/files.py" in pre_save
  313.         if file and not file._committed:

Exception Type: AttributeError at /create
Exception Value: 'file' object has no attribute '_committed'

編輯：我沒有顯示錯誤的完整軌跡：當我將對象保存到數據庫時，它告訴我該錯誤已找到：structure.save（）

Answer 1

我認為，保存時需要為FileField類型的相應字段傳遞File對象。

從Django文檔中有關保存/檢索文件的信息：

當您在模型訪問的FileField，您將得到FieldFile的實例作為訪問底層文件的代理。 FieldFile的API鏡像File的API。

FieldFile.save(name, content, save=True)

請注意，content參數應該是django.core.files.File的實例，而不是Python的內置文件對象。 您可以像這樣從現有的Python文件對象構造一個文件 ：

 from django.core.files import File f = open('/path/to/hello.world') myfile = File(f) 

因此，您可能想嘗試：

from django.core.files import File

def create(request):
    print request.POST
    filename = request.POST['name'] 
    f = open(filename, "w")
    structure = Structure(name=request.POST['name'], file=File(f))
    structure.save()
    return redirect('/structures')