Get object attribute in class based view

Question

I wonder if it is possible to get the attribute of an object in Django Class Based Views.

What I try to do is the following:

I have an UpdateView:

class FooUpdate(UpdateView):
model = Foo

page_title = <foo-object's name should go here>

page_title is processed by the template with

...
<title>
    {{ view.page_title }}
</title>
...

(this technique is described here)

urls.py looks like this:

...
url(r'^edit/(?P<pk>[0-9]+)/$', views.FooUpdate.as_view(), name="edit")
...

How can I set page_title in the view?

I am aware that there are plenty other ways to achieve this, but setting a variable in the view was really convenient (up to now) ...

Håken Lid · Accepted Answer · 2016-01-31 00:33:06Z

1

You could use a mixin to achieve something similar.

class ContextMixin:
    extra_context = {}

    def get_context_data(self, **kwargs):
        context = super(ContextMixin, self).get_context_data(**kwargs)
        context.update(self.extra_context)
        return context 

class FooUpdate(ContextMixin, UpdateView):
    model = Foo
    extra_context={'page_title': 'foo-objects name should go here'}

Edit: a different mixin, which feels bit hacky, but closer to what you want. I haven't tested it, but I think it should work.

class AutoContextMixin:

    def get_context_data(self, **kwargs):
        context = super(AutoContextMixin, self).get_context_data(**kwargs)
        for key in dir(self):
            value = getattr(self, key)
            if isinstance(value, str) and not key.startswith('_'):
                context[key] = value
        return context 

class FooUpdate(AutoContextMixin, UpdateView):
    model = Foo
    page_title = 'foo-objects name should go here'

edited Jan 31, 2016 at 0:33

answered Jan 30, 2016 at 23:13

Håken Lid

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3 Comments

speendo Over a year ago

thank you! but how would I need a mixin for that? The same could be done in FooUpdate itself, or not?

Håken Lid Over a year ago

Yes, but with a mixin you can import and reuse the code in multiple classes and apps. So you don't have to write the get_context_data every time, when you only want to add some simple values.

Håken Lid Over a year ago

I've added a second mixin example which might be closer to what you are after.

Daniel Roseman · Accepted Answer · 2016-01-30 23:01:28Z

1

No. You can't define attributes like that.

The nearest you could do would be to define a page_title method that returned self.object.your_field, but I don't see how that would be any better than overriding get_context_data and adding it there.

edited Jan 30, 2016 at 23:01

answered Jan 30, 2016 at 22:53

Daniel Roseman

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1 Comment

speendo Over a year ago

I would still have to adapt the template, right? In this case there is no advantage...

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