问限制用户可以上载的文件数量

EN

pip install django-multiuploader
python3 manage.py syncdb
python3 manage.py migrate multiuploader

MULTIUPLOADER_FILES_FOLDER = ‘multiuploader’ # - media location where to store files

MULTIUPLOADER_FILE_EXPIRATION_TIME = 3600  # - time, when the file is expired (and it can be cleaned with clean_files command).

MULTIUPLOADER_FORMS_SETTINGS =

{
'default': {
    'FILE_TYPES' : ["txt","zip","jpg","jpeg","flv","png"],
    'CONTENT_TYPES' : [
            'image/jpeg',
            'image/png',
            'application/msword',
            'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'application/vnd.ms-excel',
            'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'application/vnd.ms-powerpoint',
            'application/vnd.openxmlformats-officedocument.presentationml.presentation',
            'application/vnd.oasis.opendocument.text',
            'application/vnd.oasis.opendocument.spreadsheet',
            'application/vnd.oasis.opendocument.presentation',
            'text/plain',
            'text/rtf',
                ],
    'MAX_FILE_SIZE': 10485760,
    'MAX_FILE_NUMBER':5,
    'AUTO_UPLOAD': True,
},
'images':{
    'FILE_TYPES' : ['jpg', 'jpeg', 'png', 'gif', 'svg', 'bmp', 'tiff', 'ico' ],
    'CONTENT_TYPES' : [
        'image/gif',
        'image/jpeg',
        'image/pjpeg',
        'image/png',
        'image/svg+xml',
        'image/tiff',
        'image/vnd.microsoft.icon',
        'image/vnd.wap.wbmp',
        ],
    'MAX_FILE_SIZE': 10485760,
    'MAX_FILE_NUMBER':5,
    'AUTO_UPLOAD': True,
},
'video':{
    'FILE_TYPES' : ['flv', 'mpg', 'mpeg', 'mp4' ,'avi', 'mkv', 'ogg', 'wmv', 'mov', 'webm' ],
    'CONTENT_TYPES' : [
        'video/mpeg',
        'video/mp4',
        'video/ogg',
        'video/quicktime',
        'video/webm',
        'video/x-ms-wmv',
        'video/x-flv',
        ],
    'MAX_FILE_SIZE': 10485760,
    'MAX_FILE_NUMBER':5,
    'AUTO_UPLOAD': True,
},
'audio':{
    'FILE_TYPES' : ['mp3', 'mp4', 'ogg', 'wma', 'wax', 'wav', 'webm' ],
    'CONTENT_TYPES' : [
        'audio/basic',
        'audio/L24',
        'audio/mp4',
        'audio/mpeg',
        'audio/ogg',
        'audio/vorbis',
        'audio/x-ms-wma',
        'audio/x-ms-wax',
        'audio/vnd.rn-realaudio',
        'audio/vnd.wave',
        'audio/webm'
        ],
    'MAX_FILE_SIZE': 10485760,
    'MAX_FILE_NUMBER':5,
    'AUTO_UPLOAD': True,
}}

# forms.py

from django import forms

class FileFieldForm(forms.Form):
    file_field = forms.FileField(widget=forms.ClearableFileInput(attrs={'multiple': True}))

class StudentUploadView(View):
    model = StudentUploadedFile
    max_files_per_lesson = 3
    def post(request, *args, **kwargs):
        lesson_data_id = request.POST['student_lesson_data_id']
        current_files_count = self.model.objects.filter(
            student_lesson_data_id=lesson_data_id
        ).count()
        avail = self.max_files_per_lesson - current_files_count
        file_list = request.FILES.get_list('student_file')
        if avail - len(file_list) < 0:
            return JsonResponse(data={
                'is_valid': False,
                'reason': f'Too many files: you can only upload {avail}.'
            })
        else:
            # create one new instance of self.model for each file
            ...

class StudentUploadedFileForm(forms.ModelForm):

    class Meta:
        model = StudentUploadedFile
        fields = ('student_file', )

    def __init__(self, *args, **kwargs):
        """Accept a 'student_lesson_data' parameter."""
        self._student_lesson_data = kwargs.pop('student_lesson_data', None)
        super(StudentUploadedFileForm, self).__init__(*args, **kwargs)

    def clean(self):
        """
        Ensure that the total number of student_uploaded_file instances that
        are linked to the student_lesson_data parameter are within limits."""
        cleaned_data = super().clean()
        filecount = self._student_lesson_data.student_uploaded_file.count()
        if filecount >= 3:
            raise forms.ValidationError("Sorry, you cannot upload more than three files")
        return cleaned_data

class StudentUploadView(View):
    def get(self, request):
        # stuff ...

    def post(self, request, *args, **kwargs):
        sld_id = request.POST.get('student_lesson_data_id', None)
        student_lesson_data = StudentLessonData.objects.get(id=sld_id)
        form = StudentUploadedFileForm(
            request.POST,
            request.FILES,
            student_lesson_data=student_lesson_data
        )

        if form.is_valid():
            uploaded_file = form.save()
            # other stuff ...