Django数据库自学

Question

我有一个依赖其他模型的系统，但希望使其更加开放，因为我的用户有时需要更多一点。

目前，为了论证，我在一个 Author 模型中有 2 位作者。

john, james

当用户添加一本书，并且 Author 不可用时，如何在表单中添加 other 字段，如果选择该字段，则会生成一个额外的字段，其中用户可以输入作者的姓名，并且表单处理的方式是在提交时添加并选择新作者？

MODELS.PY

class Author(models.Model):
    name = models.CharField(max_length=30)

FORMS.PY

class AuthorForm(ModelForm):
    class Meta:
        model = Author

VIEWS.PY

def new(request, template_name='authors/new.html'):

if request.method == 'POST':
    form = AuthorForm(request.POST, request.FILES)
    if form.is_valid():
        newform = form.save(commit=False)
        newform.user = request.user
        newform.save()

        return HttpResponseRedirect('/')

else:
    form = AuthorForm()

context = { 'form':form, }

return render_to_response(template_name, context,
    context_instance=RequestContext(request))

Answer 1

假设您的书籍模型是这样的：

class Book(models.Model):
    author = models.ForeignKey(Author)
    #etc.

尝试这样的事情：

class BookForm(ModelForm):
    other = forms.CharField(max_length=200, required=False)

    def clean(self, *args, **kwargs):
        other = self.cleaned_data.get('other')
        author = self.cleaned_data.get('author')
        if author is None or author == '': 
            self.cleaned_data['author'] = Author(name=other).save()

        return self.cleaned_data

    class Meta:
        model = Book

如果作者是一个manytomanyfield：

class BookForm（ModelForm）：
其他 = forms.CharField(max_length=200, required=False)

def clean(self, *args, **kwargs):
    other = self.cleaned_data.get('other')
    author = self.cleaned_data.get('author')
    if other is not None or other != '':
        for newauthor in other.split(','): #separate new authors by comma. 
            self.cleaned_data['author'].append(Author(name=newauthor).save())

    return self.cleaned_data

class Meta:
    model = Book