Re: Benefit of 'return Foo.objects.all()' in a ListView

Brilliant, thanks both, I've got it working in both ways!

Much appreciated,

Rich

On Saturday, February 25, 2017 at 2:14:10 PM UTC, Melvyn Sopacua wrote:

Hi Richard,

 

Don't be discouraged to ask questions. It's what the list is for.

 

Ludovic is right, you'd normally use the regroup tag. But let's say you wanted to do this, then get_queryset isn't the right method.

It should return a queryset, and one only.

 

On Saturday 25 February 2017 03:42:11 Richard Jackson wrote:

 

> class MyBlogPosts(generic.ListView):

> def get_queryset(self, request):

 

My bad: request is not an argument here.

 

> ...is it possible to return two uniquely identifiable sets - for

> example, if a model has a function which returns True or False, to

> return one set for all the True and one for all the False?

 

General overview:

 

The goal of a View is to turn a HTTP request into a HTTP response. A Template provides context to the template,

A ListView uses a Template to do that and is responsible for providing a list of ModelInstances to the template. The get_queryset() method is used to retrieve those instances.

 

So, the logical place to provide a different grouping of a queryset is in the part where it gets sent to the template:

 

class BlogRoll(generic.ListView):

def get_context_data(self, **kwargs):

# let ListView do the hard work first

context = super(BlogRoll, self).get_context_data(**kwargs)

# Now make two groups

qs = context['object_list']

group1 = [ obj for obj in qs if obj.boolean_method() is True ]

group2 = [ obj for obj in qs if obj.boolean_method() is False ]

# update the context

context.update(

{ 'group1': group1, 'group2': group2 }

)

# and return it

return context

 

 

--

Melvyn Sopacua

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