Abusing Django Rest Framework Part 4: Object-level field exclusion. There are some cases where we want to exclude certain fields based on what object the user is trying. This can be a pretty big security risk when used with update views.

Hello, I have a few models with custom save definitions. I am looking to update a field in one model when I save another model based on a date comparison between the two. Unfortunately, I can't get this to work. I was wondering if someone could check out my code and see what I'm doing wrong.

On Fri, Jul 15, 2011 at 5:18 PM, Paul Walsh wrote: > I am pretty new to Django - new enough to be developing my first Django app > on 1.3. So, I am basing all my work on class-based generic views, and have > never used the older generic view functions. > A problem I have is the lack of examples and documentation on the new > class-based generic views. This is admittedly a big problem with the class-based generic views. As the person responsible for committing them, I can only offer my humble apologies for their current state. > Some might suggest I use Django Forms - it is a reasonable suggestion of > course.

But, being new, I don't have any 'view legacy' and I just like the > idea of working with class-based generic views where possible. Some might, and they would be correct:-) This isn't a legacy issue at all -- Forms and Views solve different problems. The View is solving the problem of 'how do I handle this request and convert it into a response?' The Form is solving the problem of 'How do I convert the POST data in this request into a model object (or a change to a model object)?'

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Very roughly, a view is doing the following: 1. View gets a request 2. View works out whether this is a GET or a POST 3. If its a POST, View asks the Form to turn the Post into a model change 4. Form returns success or failure 5.

View responds to the success or failure of the Form. View returns a response.

The functionality of the Form is a complete subset of the functionality of the View -- and for this reason, it's a completely interchangable internal component. Now, in simple situations, it's possible for a View to guess all the defaults for the form -- all it needs to know is that you're dealing with a Foo model, and it can construct a default Foo ModelForm. However, if you have more sophisticated form requirements, you're going to need a customized Form.

We *could* have implemented this by exposing all the options of ModelForm on the View class; but in order to keep everything clean, we kept the ModelForm isolated, and provided the View with a way to specify which Form class it's going to use. While this doesn't contribute an answer to your question, I must say that name 'class-based generic views' is a bit misleading.. Implying that these class-based views are for doing things you want to do that follow a strictly set pattern out of the box (i.e, listviews, detailviews, create views, etc.), but that you'll have to use something else (i.e., function based views) if you are defining your own views.

However, this is not the case at all. We wanted to switch all our views to class-based, and have had great success with writing our own class-based views by extending built-in view and mixin classes. Basically, most of our own views extend the generic TemplateView and we add in our own Mixins or add functionality to the overridden class methods. Some of our views extend other generic view classes. As the documentation gets updated and edited, this paradigm probably ought to be explained, because for a while I just figured that i still had to still use function views if I wanted to do anything custom, beyond what the generic views provide in and of themselves. They're a different beast but can be much more DRY and add some OO awesomeness to your code once you get your head around them.

Download drivers audio for windows 7. For now, I'd recommend looking at the source code to see which functions you can override, its pretty straightforward. Ben Juergen Schackmann 11/1/2012, 12:54 น.

I agree that it looks like self.object is None, so you can't set self.object.user as Russ wrote. How about the following: def form_valid(self, form): form.instance.user = request.user return super(CreateCampaignView, self).form_valid(form) I haven't had a chance to test the code. I hope that it works, or at least leads you in the right direction! Regards, Alasdair -- Alasdair Nicol Developer, MEMSET mail: web: Memset Ltd., registration number 4504980. 25 Frederick Sanger Road, Guildford, Surrey, GU2 7YD, UK. Alej0 12/1/2012, 15:57 น.