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POFilter in django: the last post of each user
 

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  1. POFilter in django: the last post of each user
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    <p>I have 2 models, Author and Post , how can I make a filter who can select the last post (by id field) of each Author in one only line?, the bad approach for me is :</p> <pre><code>authors = Author.objects.all() queryset = [] for author in authors: posts = Post.objects.filter(author=author).order_by('-id') if loc: queryset.append(posts[0]) </code></pre> <p>Specifically, this is to filter my Tastypie Resource "PostResource", a filter who can give me only the last post of each user, ordered by creation </p> <h2>Complete solution with okm answer and tastypie custom filter:</h2> <pre><code>class LocationResource(ModelResource): user = fields.ForeignKey(AccountResource,'user' ) class Meta: queryset = Location.objects.all().order_by('-id') resource_name = 'location' #excludes = ['id',] list_allowed_methods = ['post','get'] authentication = ApiKeyAuthentication() authorization= Authorization() filtering = {'user': ALL_WITH_RELATIONS} def obj_create(self, bundle, **kwargs): if bundle.request.method == 'POST': return super(LocationResource, self).obj_create(bundle, user=bundle.request.user) def apply_authorization_limits(self, request, object_list): return object_list.filter(user=request.user) def dehydrate(self, bundle): return bundle def build_filters(self, filters=None): if filters is None: #if you don't pass any filters at all filters = {} orm_filters = super(LocationResource, self).build_filters(filters) if('only_lasts' in filters): query = filters['only_lasts'] sqs = Location.objects.values('user_id').annotate(max_id=models.Max('id')).values('max_id') orm_filters["pk__in"] = sqs return orm_filters </code></pre>
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