Django数据库自学习

我有一个依赖于其他型号的系统，但我想让它更开放一些，因为我的用户有时需要更多

目前，为了论证起见，我在

作者

模型中有

两位作者

john, james

当用户添加一本书，而

作者

不可用时，如何在表单中添加

其他

字段，如果选中该字段，则会生成一个额外字段，用户可以在该字段中输入

作者的姓名

，表单处理方式是在提交时添加并选择新作者

型号.PY

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

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

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))

FORMS.PY

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

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

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))

视图.PY

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

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

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))

---

假设您的图书模型是：

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

试着这样做：

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

如果作者是一个多领域的人：

类图书格式（模型格式）： 其他=forms.CharField（最大长度=200，必需=False）

---

假设您的图书模型是：

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

试着这样做：

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

如果作者是一个多领域的人：

类图书格式（模型格式）： 其他=forms.CharField（最大长度=200，必需=False）