django - inlineformset_factory 创建新对象并在创建后编辑对象

Question

在 django 文档中，有一个使用 inlineformset_factory 编辑已创建的对象的示例

https://docs.djangoproject.com/en/dev/topics/forms/modelforms/#using-an-inline-formset-in-a-view

我将示例更改为这样:

def manage_books(request):
    author = Author()
    BookInlineFormSet = inlineformset_factory(Author, Book, fields=('title',))
    if request.method == "POST":
        formset = BookInlineFormSet(request.POST, request.FILES, instance=author)
        if formset.is_valid():
            formset.save()
            return HttpResponseRedirect(author.get_absolute_url())
    else:
        formset = BookInlineFormSet(instance=author)
    return render_to_response("manage_books.html", {
        "formset": formset,
    })

通过上述内容，它仅渲染内联模型，而不渲染父模型。

要使用 inlineformset_factory 创建一个新对象(例如作者)，并关联多本书，方法是什么？

使用 django 文档中的上述作者书模型的示例将会很有帮助。 django 文档仅提供了如何使用 inlineformset_factory 编辑已经创建的对象的示例，但没有创建新的

Answer 1

我已经使用 Django 基于类的 View 做到了这一点。

这是我的方法:

models.py

from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)


class Book(models.Model):
    author = models.ForeignKey(Author)
    title = models.CharField(max_length=100)

forms.py

from django.forms import ModelForm
from django.forms.models import inlineformset_factory

from crispy_forms.helper import FormHelper
from crispy_forms.layout import Layout, Fieldset

from .models import Author, Book

class AuthorForm(ModelForm):
    class Meta:
        model = Author
        fields = ('name', )

    @property
    def helper(self):
        helper = FormHelper()
        helper.form_tag = False # This is crucial.

        helper.layout = Layout(
            Fieldset('Create new author', 'name'),
        )

        return helper


class BookFormHelper(FormHelper):
    def __init__(self, *args, **kwargs):
        super(BookFormHelper, self).__init__(*args, **kwargs)
        self.form_tag = False
        self.layout = Layout(
            Fieldset("Add author's book", 'title'),
        )


BookFormset = inlineformset_factory(
    Author,
    Book,
    fields=('title', ),
    extra=2,
    can_delete=False,
)

views.py

from django.views.generic import CreateView
from django.http import HttpResponseRedirect

from .forms import AuthorForm, BookFormset, BookFormHelper
from .models import Book, Author

class AuthorCreateView(CreateView):
    form_class = AuthorForm
    template_name = 'library/manage_books.html'
    model = Author
    success_url = '/'

    def get(self, request, *args, **kwargs):
        self.object = None
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        book_form = BookFormset()
        book_formhelper = BookFormHelper()

        return self.render_to_response(
            self.get_context_data(form=form, book_form=book_form)
        )

    def post(self, request, *args, **kwargs):
        self.object = None
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        book_form = BookFormset(self.request.POST)

        if (form.is_valid() and book_form.is_valid()):
            return self.form_valid(form, book_form)

        return self.form_invalid(form, book_form)

    def form_valid(self, form, book_form):
        """
        Called if all forms are valid. Creates a Author instance along
        with associated books and then redirects to a success page.
        """
        self.object = form.save()
        book_form.instance = self.object
        book_form.save()

        return HttpResponseRedirect(self.get_success_url())

    def form_invalid(self, form, book_form):
        """
        Called if whether a form is invalid. Re-renders the context
        data with the data-filled forms and errors.
        """
        return self.render_to_response(
            self.get_context_data(form=form, book_form=book_form)
        )

    def get_context_data(self, **kwargs):
        """ Add formset and formhelper to the context_data. """
        ctx = super(AuthorCreateView, self).get_context_data(**kwargs)
        book_formhelper = BookFormHelper()

        if self.request.POST:
            ctx['form'] = AuthorForm(self.request.POST)
            ctx['book_form'] = BookFormset(self.request.POST)
            ctx['book_formhelper'] = book_formhelper
        else:
            ctx['form'] = AuthorForm()
            ctx['book_form'] = BookFormset()
            ctx['book_formhelper'] = book_formhelper

        return ctx

urls.py

from django.conf.urls import patterns, url
from django.views.generic import TemplateView

from library.views import AuthorCreateView

urlpatterns = patterns('',
    url(r'^author/manage$', AuthorCreateView.as_view(), name='handle-books'),
    url(r'^$', TemplateView.as_view(template_name='home.html'), name='home'),
)

ma​​nage_books.html

{% load crispy_forms_tags %}

<head>
  <!-- Latest compiled and minified CSS -->
  <link rel="stylesheet"
    href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
</head>

<div class='container'>
  <form method='post'>
    {% crispy form %}
    {{ book_form.management_form }}
    {{ book_form.non_form_errors }}

    {% crispy book_form book_formhelper %}
    <input class='btn btn-primary' type='submit' value='Save'>
  </form>
<div>

注意:

• 这是一个使用inlineformset_factory的简单可运行示例功能和 Django 通用基于类的 View
• 我假设 django-crispy-forms 已安装，并且正确配置完毕。
• 代码存储库托管于:https://bitbucket.org/slackmart/library_example

我知道所展示的解决方案需要更多代码，但是开始使用 Django 基于类的 View 非常棒。