Django Formset 中需要有必填字段和可选字段 [英] Need to have a Required and Optional Fields in Django Formset

问题描述

我创建了一个最多可附加 5 张图片的表单集；

1 - 但我希望验证仅在用户未附加任何图像时运行(ValidationError('atleast 1 image is required')), >

2- 当附加 1、2 或 3 个图像时，该程序也不允许用户保存，这是我真正需要的.因此，如果有 1 张或 2 张图像，则应该允许保存.

3 - 我还需要让 1 单选按钮被默认选中，以使所选图像成为模板中显示的图像

模板

{% csrf_token %}{% for hidden in form.hidden_​​fields %}{{ 隐藏 }}{% 结束为 %}{{ form.as_p }}{{ formset.management_form }}<div class="link-formset">{% 用于表单集中的选择 %}<div><label>{{choice.media }}</label><input type="radio" name="featured">{{choice.featured_image.label }}

{% 结束为 %}

<input type="submit" value="{{ submit_btn }}"></表单>

表单.py

class ProductImagesForm(forms.ModelForm):media = forms.ImageField(label='Image', required=True)features_image = forms.BooleanField(initial=True, required=True)元类:型号 = 产品图片字段 = ['media', 'featured_image']ImagesFormset = modelformset_factory(ProductImages, fields=('media', 'featured_image'), extra=5)

views.py

def form_invalid(self, form, formset):返回 self.render_to_response(self.get_context_data(form=form, formset=formset))def form_valid(self, form, formset):返回 HttpResponseRedirect(self.get_success_url())def get(self, *args, **kwargs):self.object = 无form_class = self.get_form_class()form = self.get_form(form_class)formset = ImagesFormset(queryset=ProductImages.objects.none())返回 self.render_to_response(self.get_context_data(form=form, formset=formset))def post(self, request, *args, **kwargs):self.object = 无form_class = self.get_form_class()form = self.get_form(form_class)formset = ImagesFormset(self.request.POST, self.request.FILES or None)form_valid = form.is_valid()formset_valid = formset.is_valid()如果(form.is_valid() 和 formset.is_valid()):卖家 = self.get_account()form.instance.seller = 卖家self.object = form.save()images_set = formset.save(commit=False)对于 images_set 中的 img:img.product = self.objectimg.save()formset.save()返回 self.form_valid(form, formset)别的:返回 self.form_invalid(form, formset)

解决方案

你总是可以将 min_num 和 max_num 传入 modelformset_factory

ImagesFormset = modelformset_factory(ProductImages,字段=('媒体'，'特色图像')，min_num=1,max_num=5,额外=5)

这将确保至少有 1 张图片，最多 5 张

I created a formset that has maximum of 5 images to be attached;

1 - but I want the Validation to run only when the user has not attached any image(ValidationError('atleast 1 image is required')),

2- This program is also not allowing the User to save when 1, or 2, or 3 images are attached, which I really need. So if there is 1 image or 2, that should be allowed to save.

3 - I also need to make the 1 radio-button to be selected by default, to make the selected image to be the one dispalyed in the template

template

<form enctype="multipart/form-data" action="" method="post"> {% csrf_token %} 

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

{{ form.as_p }}

{{ formset.management_form }}
<div class="link-formset">

{% for choice in formset %}
<div>
  <label>{{ choice.media }}</label>
  <input type="radio" name="featured">{{choice.featured_image.label }}
</div>
{% endfor %}
</div>

<input type="submit" value="{{ submit_btn }}">
</form>

forms.py

class ProductImagesForm(forms.ModelForm):
    media = forms.ImageField(label='Image', required=True)
    featured_image = forms.BooleanField(initial=True, required=True)
class Meta:
        model = ProductImages
        fields = ['media', 'featured_image']

ImagesFormset = modelformset_factory(ProductImages, fields=('media', 'featured_image'), extra=5)

views.py

def form_invalid(self, form, formset):
        return self.render_to_response(self.get_context_data(form=form, formset=formset))

    def form_valid(self, form, formset):
        return HttpResponseRedirect(self.get_success_url())

    def get(self, *args, **kwargs):
        self.object = None
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        formset = ImagesFormset(queryset=ProductImages.objects.none())
        return self.render_to_response(self.get_context_data(form=form, formset=formset))

    def post(self, request, *args, **kwargs):
        self.object = None
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        formset = ImagesFormset(self.request.POST, self.request.FILES or None)
        form_valid = form.is_valid()
        formset_valid = formset.is_valid()
        if (form.is_valid() and formset.is_valid()):
            seller = self.get_account()
            form.instance.seller = seller
            self.object = form.save()
            images_set = formset.save(commit=False)
            for img in images_set:
                img.product = self.object
                img.save()
            formset.save()
            return self.form_valid(form, formset)
        else:
            return self.form_invalid(form, formset)

解决方案

You can always pass in min_num and max_num to the modelformset_factory

ImagesFormset = modelformset_factory(ProductImages, 
                                     fields=('media', 'featured_image'),  
                                     min_num=1,
                                     max_num=5,
                                     extra=5)

This will ensure that there is at least 1 image and max 5

这篇关于Django Formset 中需要有必填字段和可选字段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！