Django Views Incrementing Variables

Question

當我增加一個變量時，它只會上升到2而不是3.默認值是1.我不知道我在想什麼。任何幫助表示讚賞。

def unanswered(request, template ='unanswered.html'): 
    phone_number = Pool.objects.order_by('?')[0] 
    pool = Pool.objects.order_by('?')[0] 
    pool_list = Pool.objects.all() 
    number_attempts = Pool.objects.filter(phone_number=phone_number).count() 


    # unanswer number action 

     if pool_list: 
      if number_attempts > 3: 
       return number_attempts 

      else: 
       x = number_attempts 
       x += 1 
       print x 'returns 2' 
       store = Pool(id=phone_number.id, 
          phone_number = phone_number.phone_number, 
          un_answered=x, answered=0) 
       store.save() 

    payload = {'pool':pool,} 

    return render_to_response(template, payload, context_instance=RequestContext(request)) 

Answer 1

。在你的代碼中沒有任何for loop或while loop，因此，如果初始number_attempts是1，這將增加至2並完成流程。

我看到你想在數據庫中存儲企圖，但你所做的方式是不正確的。您正在通過id=phone_number.id至Store(...)，如果存在給定的id，它將嘗試更新現有記錄。所以Pool.objects.filter(phone_number=phone_number).count()始終返回1.

您可能希望將其更改爲

store = Pool(phone_number = phone_number.phone_number, 
      un_answered=x, answered=0) 

所以下一個請求，Pool.objects.filter(phone_number=phone_number).count()會給你意見後2

---

更新：

我想要的只是從1,2,3更新un_answered字段。

在這種情況下，請不要使用.count()來獲取嘗試失敗次數使用具有該計數器的對象中的字段。

所以不是

number_attempts = Pool.objects.filter(phone_number=phone_number).count() 

你可以做到這一點

try: 
    store = Pool.objects.get(phone_number=phone_number) 
    number_attempts = store.un_answered 

# FIX : the original code used a bare except clause. 
# Bare except clauses are EVIL. DONT use bare except clauses. NEVER. 
# Or thou shall burn in the flames of hell for your eternal death.... 

except Pool.DoesNotExist: 
    store = Pool(phone_number = phone_number.phone_number, 
       un_answered=1, answered=0) 
    store.save() 
    number_attempts = 1 

... 
if pool_list: 
     if number_attempts > 3: 
      return number_attempts 

     else: 
      x = number_attempts 
      x += 1 
      print x 'returns 2' 
      store.un_answered = x 
      store.save()