Django - 如何記住值並在表單驗證中顯示錯誤？

Question

我沒有得到如何記住值並在表單驗證中顯示錯誤。

這裏是我的代碼：

template.html：

<form method="post" action="/submeter/anuncio/">{% csrf_token %} 
    {{form_main.as_p}} 
    {{form_bicyclead.as_p}} 
    {{form_bicycleadcategory.as_p}} 
    {{form_bicycleaditemkindandpropertyvalueform.as_p}} 
    <input type="hidden" name="section" value="5" /> 
    <input type="submit"> 
</form> 

views.py：

def submit_ad_view(request): 
    if request.method == 'POST':  
     model_main = Main() 
     model_main.section = Section.objects.get(pk=request.POST['section']) 
     model_main.user = request.user 

     model_bicyclead = BicycleAd() 
     model_bicyclead.bicycleadtype = BicycleAdType.objects.get(pk=2) 
     model_bicyclead.bicycleaditemkind = BicycleAdItemKind.objects.get(pk=4) 
     model_bicyclead.bicycleadcondition = BicycleAdCondition.objects.get(pk=2) 
     model_bicyclead.city = GeonamesLocal.objects.get(pk=4803854) 


     form_main = MainForm(request.POST, instance = model_main) 
     form_bicyclead = BicycleAdForm(request.POST, instance = model_bicyclead) 
     form_bicycleadcategory = BicycleAdCategoryForm(request.POST) 

     if form_main.is_valid() and form_bicyclead.is_valid() and form_bicycleadcategory.is_valid(): 
      main_f = form_main.save() 

      bicyclead_f = form_bicyclead.save(commit=False) 
      bicyclead_f.main = main_f 
      bicyclead_f.save() 

      bicycleadcategory_f = form_bicycleadcategory.save(commit=False, rel_obj=model_bicyclead) 


      resultado = 'valid' 
     else: 
      resultado = 'n_valid' 

     return render_to_response('app_p/submit_ad.html', {'form_main': form_main, 'form_bicyclead': form_bicyclead, 'form_bicycleadcategory': form_bicycleadcategory, 'form_bicycleaditemkindandpropertyvalueform': form_bicycleaditemkindandpropertyvalueform}, context_instance=RequestContext(request)) 
    else: 
     form_main = MainForm() 
     form_bicyclead = BicycleAdForm() 
     form_bicycleadcategory = BicycleAdCategoryForm() 
     form_bicycleaditemkindandpropertyvalueform = BicycleAdItemKindAndPropertyValueForm() 

     return render_to_response('app_p/submit_ad.html', {'form_main': form_main, 'form_bicyclead': form_bicyclead, 'form_bicycleadcategory': form_bicycleadcategory, 'form_bicycleaditemkindandpropertyvalueform': form_bicycleaditemkindandpropertyvalueform}, context_instance=RequestContext(request)) 

對什麼是錯在這個模板中的某些線索，並以沒有得到錯誤並且不記得表單的值？

最好的問候，

Answer 1

我看到兩個問題與您的代碼，先在if您使用來驗證您的形式，當第一種形式返回False其餘部分將不進行驗證。

其次，當他們中的一個無效並且您沒有傳遞任何值時，您正在重新創建表單，因此它們最終會變空並且帶有驗證信息。