重寫節省權限

Question

（）模型的方法我試圖重寫保存（）方法，所以只有創建者和管理員能夠以更新模型字段值：

if not self.pk: 
     super(Shastra, self).save(*args, **kwargs) 
else: 
     if (self.person == args[0].user) or (self.person.is_superuser): 
      super(Shastra, self).save(*args, **kwargs) 

雖然更新很傳遞請求保存方法爲

def edit(request, shastra_id): 
    shastra_id = int(shastra_id) 
    shastra = Shastra.objects.get(pk = shastra_id) 
    if request.method == 'POST': 
     form_shastra_edit = ShastraEditForm(request.POST, instance = shastra) 
     if form_shastra_edit.is_valid(): 
      form_shastra_edit.save(request) 
      return HttpResponseRedirect('/edited/successfully') 
    else: 
    form_shastra_edit = ShastraEditForm(instance = shastra) 

但是我得到「元組索引超出範圍」錯誤。這有什麼問題？

Answer 1

您不能在Model.save（）方法中使用請求。您必須在您的視圖方法中進行基於請求的驗證（例如在您的編輯方法中）。模型層是不知道的「請求」對象..

讓你的編輯方法是這樣的：

def edit(request, shastra_id): 
    shastra_id = int(shastra_id) 
    shastra = Shastra.objects.get(pk = shastra_id) 
    if request.method == 'POST': 
     form_shastra_edit = ShastraEditForm(request.POST, instance = shastra) 
     if form_shastra_edit.is_valid() and shastra.user == request.user: 
       form_shastra_edit.save(request) 
       return HttpResponseRedirect('/edited/successfully') 
    else: 
     form_shastra_edit = ShastraEditForm(instance = shastra)