2015-04-08 95 views
0

我建立了一個模板,其中填充了來自數據庫的數據並且用戶可以更新更改。問題是,我的代碼正在創建一條新記錄,而不是更新現有的記錄。Django創建新記錄而不是更新

型號:

class Users(models.Model): 
    first_name = models.CharField(max_length=50) 
    last_name = models.CharField(max_length=50) 
    email = models.CharField(max_length=100) 

class Event(models.Model): 
    event_admin = models.ForeignKey(Users) 
    event_name = models.CharField(max_length=50) 
    event_location = models.CharField(max_length=50) 
    event_date = models.DateField() 
    event_time = models.TimeField() 
    event_notes = models.CharField(max_length=200) 

查看:

def edit_event(request, id):  
if request.method == 'POST': 
    e1 = CreateEventForm(request.POST) 
    if e1.is_valid(): 
     e1 = e1.save(commit=False) 
     temp = get_object_or_404(Event, id = id) 
     admin = temp.event_admin 
     e1.event_admin = admin 
     e1.save() 

     eventID = e1.id 
     return HttpResponseRedirect('/app/' + str(eventID))   
else:    
    event = CreateEventForm(instance=get_object_or_404(Event, id=id)) 
    return render(request, 'edit_event.html', {'event':event}) 

我相信我的問題是,我不是更新當前對象,而是建立一個新的。但是,在處理現有記錄時,我遇到了分配event_admin中所需外鍵的問題。

回答

3

您應該通過instance參數的構造函數形式:

event = get_object_or_404(Event, id=id) 
form = CreateEventForm(request.POST, instance=event) 
if form.is_valid(): 
    form.save() 
    return HttpResponseRedirect('/app/' + str(event.id)) 

你們爲什麼重新分配在Event實例event_admin場?

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