通數據庫值

Question

我form.py：

class BannerForm(forms.ModelForm): 
    name = forms.CharField(max_length=32) 
    #Affiliazione = forms.CharField(disabled = True, initial='red') #in original question 
    #affiliation = forms.ModelChoiceField(Affiliation.objects.all(), 
    #widget=forms.HiddenInput(), initial=Affiliation.objects.get(id=1)) #in original question 
    Affiliazione = forms.CharField(disabled = True, required=False) #added after first answer 
    affiliation = forms.ModelChoiceField(Affiliation.objects.all(), 
    widget=forms.HiddenInput()) #added after first answer 

的 'Affiliazione' 字段顯示 '紅色'，但它不保存，因爲Disabled controls cannot be successful。 「隸屬關係」字段實際上傳遞了數據，但是隱藏起來。它們一起給我想要的東西（一個傳遞數據的禁用字段，以便用戶可以看到值但不能改變它）。

問題是我不喜歡硬編碼值（'紅'和'id = 1'）。我在模型中有'選項'類，我選擇要通過的值，但我不知道如何......我認爲這是一個愚蠢的問題，對不起，但有人可以幫助我？

我models.py：

class Options(models.Model): 
    new_affiliation = models.ForeignKey('Affiliation') 

class Affiliation(models.Model): 
    name = models.CharField(max_length=32, unique=True) 
    def __str__(self): 
     return self.name 

class Banner(models.Model): 
    name = models.CharField(max_length=32, unique=True) 
    affiliation = models.ForeignKey(Affiliation) 

編輯。我View.py：

def add_banner(request): 
    # A HTTP POST? 
    if request.method == 'POST': 
     form = BannerForm(request.POST) 
     print('form is post') #control 
     # Have we been provided with a valid form? 
     if form.is_valid(): 
      print('form is valid') #control 
      # Save the new banner to the database. 
      banner = form.save(commit=False) 
      #some irrilevant code here 
      form.save(commit=True) 
      print('form salvato') #control 
      # Now call the homepage() view. 
      # The user will be shown the homepage. 
      return homepage(request) 
     else: 
      # The supplied form contained errors - just print them to the terminal 
      print (form.errors) 
    else: 
     # If the request was not a POST, display the form to enter details 
     #form = BannerForm(request.POST) #in original question 
     #initial_value = 'red' #added after first answer 
     #init = Affiliation.objects.get(id=1) #added after first answer 
     form = BannerForm(request.POST or None, initial={ 
     'affiliation': Campaign_Options.new_regent_affiliation}) #added after first answer 
    # Bad form (or form details), no form supplied... 
    # Render the form with error messages (if any). 
    print ('fine') 
    return render(request, 'core/add_banner.html', {'form': form}) 

我add_banner.html：

{% csrf_token %} 
    {% for hidden in form.hidden_fields %} 
    {{ hidden }} 
    {% endfor %} 

    {% for field in form.visible_fields %} 
    {{ field.errors }} 
    {{ field.label }} 
    {{ field }} 
    {{ field.help_text }} 
    <br /> 
    {% endfor %} 

Answer 1

即使我不知道你這個形式的意圖，但回答你的問題的緣故，你可以通過從初始值當你初始化形式的意見，這將使價值靈活：

def your_view(request): 
    # get the string for affilizione by applying your logic here 
    # initial_value = 'red' 
    form = BannerForm(request.POST or None, initial={'Affiliazione': initial_value})