Probleme mit dem Speichern mehrerer Bilder in Django

Question

Ich habe Probleme mit dem Speichern von Dateien in Django. Kann mir jemand helfen?

Ich habe Formular mit 2 Feldern: description und image. Nach Bildfeld kann der Benutzer mehrere Bilder laden. Um ein Bildfeld zu erstellen, habe ich django-multiupload App verwendet. Außerdem lade ich Daten von Ajax zum Server. Ich habe den nächsten Code ausprobiert, aber es ist ein Fehler aufgetreten. Wie behebe ich dieses Problem? Probleme beim Speichern von Bilddateien. Von Traceback verstehe ich das Problem in dieser Linie der Ansicht gestartet: article = article_form.save(commit=False)

models.py:

class Article(models.Model): 
    project = models.ForeignKey(Project, on_delete=models.CASCADE) 
    description = models.TextField(_('Description')) 

class Image(models.Model): 
    article= models.ForeignKey(Article, on_delete=models.CASCADE) 
    image = models.FileField(_('Image'), upload_to='images/%Y/%m/%d/') 

forms.py:

class ArticleForm(forms.ModelForm): 
    class Meta: 
     model = Article 
     fields = ('description',) 

    image = MultiFileField() 

    def save(self, commit=True): 
     instance = super(ArticleForm, self).save(commit) 
     for each in self.cleaned_data['image']: 
      Image.objects.create(image=each, article=instance) 
     return instance 

views.py:

def article_add(request, project_id): 
    data = dict() 
    project = get_object_or_404(Project, pk=project_id) 
    if request.method == 'POST': 
     article_form = ArticleForm(request.POST, request.FILES) 
     if article_form.is_valid(): 
      article = article_form.save(commit=False) 
      article.project = project 
      article.save() 
      data['form_is_valid'] = True 
      articles = Article.objects.all 
      context = {'articles': articles} 
      context.update(csrf(request)) 
      data['html_article'] = render_to_string('project/article_list.html', context) 
     else: 
      data['form_is_valid'] = False 
    else: 
     article_form = ArticleForm() 
    context = {'article_form': article_form} 
    data['html_article_form'] = render_to_string('project/article_add.html', context, request=request) 
    return JsonResponse(data) 

JS:

$(function() { 
    var loadForm = function() { 
     var btn = $(this); 
     $.ajax({ 
      url: btn.attr("data-url"), 
      type: 'get', 
      dataType: 'json', 
      beforeSend: function() { 
       $("#modal").modal("show"); 
      }, 
      success: function (data) { 
       $("#modal .modal-content").html(data.html_article_form); 
      } 
     }); 
    }; 

    var saveForm = function() { 
     var form = $(this); 
     var dataForm = new FormData(form.get(0)); 
     $.ajax({ 
      url: form.attr("action"), 
      data: dataForm 
      type: form.attr("method"), 
      dataType: 'json', 
      success: function (data) { 
       if (data.form_is_valid) { 
        $("#article-list").html(data.html_article); 
        $("#modal").modal("hide"); 
       } 
       else { 
        $("#modal .modal-content").html(data.html_article_form); 
       } 
      } 
     }); 
     return false; 
    }; 

    // Create Article 
    $("#article-add-button").click(loadForm); 
    $("#modal").on("submit", ".js-article-add-form", saveForm); 

    // Update Article 
    $("#article-list").on("click", "#js-edit-article-button", loadForm); 
    $("#modal").on("submit", ".js-article-edit-form", saveForm); 
}); 

ERROR:

Traceback (most recent call last): 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\exception.py", line 39, in inner 
    response = get_response(request) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\reversion\revisions.py", line 296, in do_revision_context 
    return func(*args, **kwargs) 
    File "C:\Users\Nurzhan\PycharmProjects\RMS\project\views.py", line 1673, in article_add 
    article = article_form.save(commit=False) 
    File "C:\Users\Nurzhan\PycharmProjects\RMS\project\forms.py", line 271, in save 
    Image.objects.create(image=each, article=instance) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\manager.py", line 85, in manager_method 
    return getattr(self.get_queryset(), name)(*args, **kwargs) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\query.py", line 399, in create 
    obj.save(force_insert=True, using=self.db) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\base.py", line 796, in save 
    force_update=force_update, update_fields=update_fields) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\base.py", line 824, in save_base 
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\base.py", line 908, in _save_table 
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\base.py", line 947, in _do_insert 
    using=using, raw=raw) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\manager.py", line 85, in manager_method 
    return getattr(self.get_queryset(), name)(*args, **kwargs) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\query.py", line 1045, in _insert 
    return query.get_compiler(using=using).execute_sql(return_id) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\sql\compiler.py", line 1054, in execute_sql 
    cursor.execute(sql, params) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\backends\utils.py", line 79, in execute 
    return super(CursorDebugWrapper, self).execute(sql, params) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\backends\utils.py", line 64, in execute 
    return self.cursor.execute(sql, params) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\utils.py", line 94, in __exit__ 
    six.reraise(dj_exc_type, dj_exc_value, traceback) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\utils\six.py", line 685, in reraise 
    raise value.with_traceback(tb) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\backends\utils.py", line 64, in execute 
    return self.cursor.execute(sql, params) 
    File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\sql_server\pyodbc\base.py", line 539, in execute 
    return self.cursor.execute(sql, params) 
django.db.utils.IntegrityError: ('23000', '[23000] [Microsoft][ODBC SQL Server Driver][SQL Server]�������� ���������� INSERT � ������������ FOREIGN KEY "project_image_article_id_1cd62783_fk_project_article_id". �������� ��������� � ���� ������ "RMS", ������� "dbo.project_article", column \'code\'. (547) (SQLExecDirectW)') 

Answer 1

Das ist ein intergrity Fehler ist, die zeigt, dass der Fremdschlüssel existiert nicht. Es ergibt sich aus diesem Code

def save(self, commit=True): 
    instance = super(ArticleForm, self).save(commit) 
    for each in self.cleaned_data['image']: 
     Image.objects.create(image=each, article=instance) 
    return instance 

Das erste Mal, wenn Sie das Formular speichern Methode aufrufen, Sie tun dies, ohne dass der Artikel gespeichert werden. Was bedeutet, dass der Artikel kein PK hat. Dies wiederum bedeutet, dass das Bild nicht den referenziellen Intergritätsregeln für seinen Fremdschlüssel entspricht.

Ich schlage vor, Sie bewegen dieses Bit zu Ihrer Ansicht könnte es so aussehen.

if article_form.is_valid(): 
     article = article_form.save(commit=False) 
     article.project = project 
     article.save() 
     for each in article_form.cleaned_data['image']: 
      Image.objects.create(image=each, article=instance) 

Lassen Sie es ausgeführt werden, nachdem der Artikel festgeschrieben wurde.