django-models - Django：如何在模型的 clean 方法中获取动态添加的表单字段

Question

我对 Django 很陌生。以下是我想要实现的目标

我根据从视图中获得的模型 (configurable_product_options_model) 在表单上动态添加一些字段。我的想法是利用这些动态添加的字段来创建激活记录（ActivationRecord (models.Model)）。我无法在我的模型 ActivationRecord 的 clean 函数中获取这些字段（其中没有一个映射到我的模型中的数据字段[显然]）来创建一些保存在数据库中的条目。

看法

def activation_record(request):

    configurable_product_options_modeltouse = None 
    product_options_modeltouse = None

    if request.session['feature_name'] == "M-Vault" :
        product_options_modeltouse = MLink_Product_Options
        configurable_product_options_modeltouse = MLink_Configurable_Product_Options

    # if this is a POST request we need to process the form data
    if request.method == 'POST':
        # create a form instance and populate it with data from the request:

        feature = request.session['feature_name']

        form = ActivationRecordForm (request.POST, product_options_model = product_options_modeltouse, 
                                     configurable_product_options_model = configurable_product_options_modeltouse)
        # check whether it's valid:
        if form.is_valid():
            # process the data in form.cleaned_data as required
            # redirect to a new URL: 
            form.save()
            return redirect('/admin/sales_portal/activationrequest/')

    # if a GET (or any other method) we'll create a blank form
    else:

        form = ActivationRecordForm(initial={'feature_name' : request.session['feature_name'],
                                             'customer_reference' : request.session['customer_reference'],
                                             'host_method'  : request.session['host_method'],
                                             'host_id'      : request.session['host_id'],
                                             'activation_type' : request.session['activation_type']}, 
                                             product_options_model = product_options_modeltouse,
                                             configurable_product_options_model = configurable_product_options_modeltouse)

        # Disabled the populatd fieds in the ISODE activation record form
        form.fields['host_id'].widget.attrs['readonly'] = True

    return render(request, 'sales_portal/activation_record.html', {'form': form})

形式

class ActivationRecordForm (ModelForm) :

def __init__(self, *args, **kwargs) :

    # Populate product options from the model based on the feature in the activation request

    product_options_model = kwargs.pop('product_options_model')
    configurable_product_options_model = kwargs.pop('configurable_product_options_model')

    super(ActivationRecordForm, self).__init__(*args, **kwargs)

    # Add product options in the form
    if product_options_model :
        self.fields['sub_feature'] = forms.ModelMultipleChoiceField(label='Product Options ', 
                                           required=False, 
                                           queryset = product_options_model.objects.all())

    # Add configurable product options in the form
    if configurable_product_options_model : 
        queryset = configurable_product_options_model.objects.all()
        for configurable_product_options in queryset :
            name = "%s " % configurable_product_options
            self.fields[name] = forms.CharField(required=False, 
                                           widget=forms.TextInput(attrs={'id':'CONFIGURABLE_PRODUCT_OPTION'}))

在 ActivationRecord 模型的 clean 函数中，我想利用这些动态添加的字段（“%s” %configurable_product_options）中填充的数据。我正在尝试自己弄清楚（我相信一定有一种非常简单的方法可以做到这一点，但如果有人能给我提示，我将不胜感激）。尝试了 get_fields() 但它没有列出表单上动态添加的字段。

class ActivationRecord (models.Model) :
    def clean (self) :
    fields = self._meta.get_fields() 

标签： django-modelsdjango-forms

Answer 1

我意识到正确的方法（也许）不在模型中，而是在我看来。想法是在不保存表单（commit=False）的情况下获取模型对象，然后在再次保存之前根据可配置参数对其进行修改。

if request.method == 'POST':

    feature = request.session['feature_name']

    form = ActivationRecordForm (request.POST, product_options_model = product_options_modeltouse, 
                                 configurable_product_options_model = configurable_product_options_modeltouse)

    # check whether it's valid:
    if form.is_valid():

        queryset = configurable_product_options_modeltouse.objects.all()

        product_options = []

        for configurable_product_options in queryset :
            if form.cleaned_data["%s " % configurable_product_options] :
                val = str(configurable_product_options) # Get the label
                val = val.replace(" ", "") # Remove spaces from the label
                val = val.lower() # Make the label lowercase
                val = val+"="+str(form.cleaned_data["%s " % configurable_product_options])  
                product_options.append(val)

        # modify the activation record with the configurable product options before 
        # saving the form and redirecting to a new URL: 
        if product_options :
           activation_record_object = form.save(commit=False)
           activation_record_object.sub_feature = str(activation_record_object.sub_feature)+ "," + ",".join(product_options)

        form.save()