最經編寫一個model時處理filefiled，使用post_form.save()進行新增和編輯檔案儲存位置不統一，如果出現重複檔名重複的話，上傳檔名會被改名。

現有程式碼如下：

models.py

class Wechat_Pubno(models.Model):
    name = models.CharField(verbose_name='名稱*' , max_length=30 , blank=False , unique=True)
    qr_code = models.ImageField(verbose_name='二維碼', upload_to='upload/basicdata/wechat_pubno')
   def __str__(self):
    return self.name
 

class Forms_Wechat_Pubno(forms.ModelForm):
    def __init__(self , *args , **kwargs):
        super(Forms_Wechat_Pubno , self).__init__(*args, **kwargs)
        self.fields['qr_code'].required = False

    class Meta :
        model = Wechat_Pubno
        fields = '__all__'

def add(request):
    if request.method == 'POST':
        post_form = forms(request.POST,request.FILES)
        if post_form.is_valid():
            post_form.save()
            #配合post_form = forms(request.POST,request.FILES)，web頁面上傳檔案正常儲存，而且不會重複
            return HttpResponseRedirect(reverse('list_' + self.model_name))
        else :
            errors_message = post_form.errors
            write_log('warning' , op_user, model_cnname + '新增失敗' + str(post_form) + '，原因如下：\n' + str(errors_message))
            return render(request, 'result.html', {'error_message': str(errors_message)})
    else :
        get_form = forms()
        request_dict = {'title_name' : title_name , 'get_form': get_form} 
        return render(request, 'add_edit.html', request_dict)
 

def add(request):
    if request.method == 'POST':
        post_form = forms(request.POST,request.FILES)
        if post_form.is_valid():
        # 這段程式碼完全是為了處理filefiled，如果不需要使用filefiled的話，直接post_form.save()
            media_dir = MEDIA_ROOT.replace(BASE_DIR + '/', '')
            new_value = {}
            for key in detail_field_list :
            # 處理filefield
                try :
                    if key in filefield_dict :
                        filename = key + '_' + str(request.FILES[key])
                        # 檔名，欄位名+上傳檔名
                        file = request.FILES[key]
                        upload_dir = MEDIA_ROOT + '/upload/' + app_name + '/' + model_name + '/' + request.POST.get('name') + '/'
                        # 上傳目錄，MEDIA_ROOT/upload/app名/modles名/欄位name的值/
                                
                        from library.webpage import uploadfile
                        fullfilename = uploadfile(file, filename, upload_dir)
                        # 最終目錄為MEDIA_ROOT.replace(BASE_DIR,'')/upload/app名/modles名/欄位name的值/欄位名_上傳檔名，防止出現重複替換操作
                        value = media_dir + '/upload/' + app_name + '/' + model_name + '/' + request.POST.get('name') + '/' + filename
                        # 資料庫中寫相對路徑
                    else :
                        value = request.POST.get(key)
                except :
                    value = request.POST.get(key)
                    
                # 日期轉換
                if re.search('^[0-9][0-9][0-9][0-9]/[0-1][0-9]', str(value)) :
                    from library.handle_datetime import date_convert
                    new_value[key] = date_convert(value , '%Y-%m-%d')
                else:
                    new_value[key] = value
    
            try :
                import_models.objects.create(**new_value)
            except Exception as e :
                print('新增資料失敗，' + str(new_value) + '，原因如下：\n' + str(e))

            return HttpResponseRedirect(reverse('list_' + model_name))
        else :
            ......
    else :
        ......
 

這樣的話，可以統一，便於展示頁面展示圖片