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Django小技巧15: 使用基于类视图的Mixins

Posted November 05, 2018

翻译整理自: simpleisbetterthancomplex.com

今天讲述三点关于 Mixins 使用的一些规范:

Django 提供的View 保持在继承的最右边.
Mixins 在基本视图的左侧
Mixins 应该继承Python的内置对象类型(object).

下面举例说明规则

class FormMessageMixin(object):
    @property
    def form_valid_message(self):
        return NotImplemented

    form_invalid_message = 'Please correct the errors below.'

    def form_valid(self, form):
        messages.success(self.request, self.form_valid_message)
        return super(FormMessageMixin, self).form_valid(form)

    def form_invalid(self, form):
        messages.error(self.request, self.form_invalid_message)
        return super(FormMessageMixin, self).form_invalid(form)


class DocumentCreateView(FormMessageMixin, CreateView):
    model = Document
    fields = ('name', 'file')
    success_url = reverse_lazy('documents')
    form_valid_message = 'The document was successfully created!'

<\>Python

依类似的方式，你可以在UpdateView中，重用相同的FormMessageMixin, 并覆盖默认的form_invalid_message方法.

class DocumentUpdateView(FormMessageMixin, UpdateView):
    model = Document
    fields = ('name', )
    success_url = reverse_lazy('documents')
    form_valid_message = 'The document was successfully updated!'
    form_invalid_message = 'There are some errors in the form below.'

<\>Python

Django 1.9开始，内置的LoginRequiredMixin和UserPassesTestMixin. 如果你要在视图中使用它们，它们始终位于最左侧:

class DocumentUpdateView(LoginRequiredMixin, FormMessageMixin, UpdateView):
    model = Document
    fields = ('name', )
    success_url = reverse_lazy('documents')
    form_valid_message = 'The document was successfully updated!'

#Mixins在左,View在后

<\>Python

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#Django小技巧