为什么内联表单集不验证

Question

我有两个具有外键关系的模型

models.py

from django.db import models

# Create your models here.
class Project(models.Model):
    STATUSES = (
        ('Ongoing', 'Ongoing'),
        ('Completed', 'Completed')
    )

    YEARS = (
        (2019, 2019),
        (2020, 2020),
        (2021, 2021),
        (2022, 2022)
    )
    
    name = models.CharField(max_length=200)
    client = models.CharField(max_length=100)
    year = models.SmallIntegerField(choices=YEARS)
    status = models.CharField(max_length=10, choices=STATUSES)
    picture = models.ImageField(blank=True, null=True)
    description = models.TextField(blank=True, null=True)

    def __str__(self):
        return self.name


class Photo(models.Model):
    project = models.ForeignKey("Project", on_delete=models.CASCADE, related_name="images", blank=True, null=True)
    image = models.ImageField()
    description = models.CharField(max_length=100, blank=True, null=True)
    slide = models.BooleanField(default=False)

我希望在同一个表单上创建照片和项目，所以我使用了 inline_formset_factory

forms.py

from django.forms import inlineformset_factory
from projects.models import Photo, Project
from django.forms import ModelForm


class ProjectModelForm(ModelForm):
    class Meta:
        model = Project
        fields = (
            'name',
            'client',
            'year',
            'picture',
            'status',
            'description',
        )


class PhotoModelForm(ModelForm):
    class Meta:
        model = Photo
        fields = (
            'image',
            'slide',
            'description'
        )


PhotoFormset = inlineformset_factory(Project, Photo, form=PhotoModelForm, extra=1)

我使用了通用的 CreateView

views.py

from django.contrib.auth.mixins import LoginRequiredMixin
from projects.forms import PhotoFormset, ProjectModelForm
from django.shortcuts import redirect, reverse, render
from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView
from .models import Photo, Project

# Create your views here.
class ProjectCreateView(LoginRequiredMixin, CreateView):
    template_name = 'projects/project_create.html'
    form_class = ProjectModelForm

    def get_context_data(self, **kwargs):
        context = super(ProjectCreateView, self).get_context_data(**kwargs)
        context['photos_formset'] = PhotoFormset()
        return context
    
    def post(self, request, *args, **kwargs):
        self.object = None
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        photo_formset = PhotoFormset(self.request.POST)
        if form.is_valid() and photo_formset.is_valid():
            return self.form_valid(form, photo_formset)
        else:
            return self.form_invalid(form, photo_formset)
    
    def form_valid(self, form, photo_formset):
        self.object = form.save(commit=False)
        self.object.save()
        print('valid')
        photos = photo_formset.save(commit=False)
        for photo in photos:
            photo.project = self.object
            photo.save()
        return reverse('projects:projectspage')

    def form_invalid(self, form, photo_formset):
        if not photo_formset.is_valid():
            print('invalid formset')
        return self.render_to_response(
            self.get_context_data(form=form, photos_formset=photo_formset)
        )

    def get_success_url(self):
        return reverse('projects:projectspage')

这是模板

{% extends 'base.html' %}
{% load crispy_forms_filters %}
<!-- crispy_forms_tags -->

{% block content %}
    <div class="container">
        <h2>create new project</h2>
        <form method="post">
            {% csrf_token %}
            {{ form|crispy }}
            <h2 class="display-6 my-5">
                Add photos
            </h2>
            {{ photos_formset.as_p }}
            <input type="submit" value="Create" class="btn btn-primary">
        </form>
    </div>
{% endblock content %}

当我提交form_invalid时从视图的post方法返回

我如何让 inline_formset 验证或有更好的方法来做它

Answer 1

我更喜欢把这些视图写成函数，看起来更直接，试试：

@login_required
def post_news(request):
    if request.method == 'POST':
        project_form = ProjectModelForm(request.POST, request.FILES)
        photo_form = PhotoModelForm(request.POST, request.FILES)
        picture = request.FILES['picture']
        image = request.FILES['image']
        if project_form.is_valid() and photo_form.is_valid():
            project_instance = project_form.save(commit=False)
            project_instance.picture = picture
            project_instance.save()
            photo_instance = project_form.save(commit=False)
            photo_instance.project = project_instance
            photo_instance.image = image
            photo_instance.save()                

            return reverse('projects:projectspage')
else:
    project_form = ProjectModelForm()
    photo_form = PhotoModelForm()

return render(request, 'projects/project_create.html',
              {'project_form': project_form, 'photo_form': photo_form})

我认为，当没有提供项目模型的图片时，您将不得不考虑这种情况。只需将两个表单都弹出到您的模板中，这应该可以工作。