Hey, thank you. I tried your approach and is looks very promising but I am getting an error. Here is my view:
*class AssemblyDetailView(LoginRequiredMixin, DetailView):* * model = Assembly* * template_name = "engineering/assembly/assembly_detail.html"* * assem = Assembly.objects.all()* * sa = assem.subassembly.all()* * comp = assem.component.all()* * def get_context_data(self, **kwargs):* * context = super().get_context_data(**kwargs)* * context['sa'] = self.sa* * context['comp'] = self.comp* * return context* Console tells me: AttributeError: 'QuerySet' object has no attribute 'subassembly' print(assem) gives me the right QuerySet: *<QuerySet [<Assembly: assembly1>]>* It's been a long day but I had to try your suggestion today! Maybe I'm just tired and do not recognise the current problem... [email protected] schrieb am Donnerstag, 19. August 2021 um 15:56:01 UTC+2: > I would create two dictionaries, one for subassembly and one for component. > > then in your view, loop through the first group, pulling your data from a > master dataset: > > assem = Assembly.objects.all() > sa = assem.subassembly.all() > comp = assem.component.all() > > send 'sa' and 'comp' to your template as context variables > > Then in your template, loop through 'sa' with an inner loop of 'comp' and > you should be able to manipulate the output like what you're seeking. > > On Wednesday, August 18, 2021 at 9:57:58 AM UTC-5 [email protected] wrote: > >> Hi, >> >> I am now trying, for days, to get a tree like view from my assembly model >> into my template. I think I have read everything what I have found on >> StackOverflow and other sites. Somehow I am not able to get it working. I >> am trying to not use any 3rd party extensions => I'm happy to be proven >> wrong. But first let me explain my topic: >> >> This are my models: >> >> class Assembly(models.Model): >> reference = models.OneToOneField('products.Reference', >> on_delete=models.RESTRICT, verbose_name=_('reference')) >> subassembly = models.ManyToManyField(SubAssembly, blank=True, >> verbose_name=_('subassembly')) >> component = models.ManyToManyField(Component, blank=True, >> verbose_name=_('component')) >> >> class SubAssembly(models.Model): >> reference = models.CharField(max_length=40, default=None) >> subassembly_class = models.ForeignKey(SubAssemblyClass, >> on_delete=models.CASCADE) >> nested_subassembly = models.ManyToManyField( >> 'self', symmetrical=False, blank=True) >> >> class SubAssemblyClass(models.Model): >> name = models.CharField(max_length=255) >> >> class Component(models.Model): >> reference = models.CharField(max_length=40, unique=True) >> component_class = models.ForeignKey(ComponentClass, >> on_delete=models.CASCADE) >> nested_component = models.ManyToManyField('self', blank=True') >> >> class ComponentClass(models.Model): >> name = models.CharField(max_length=255, unique=True) >> >> >> For my view I am using the class based one. I am generally using CBV's >> >> class AssemblyDetailView(LoginRequiredMixin, DetailView): >> model = Assembly >> template_name = "engineering/assembly/assembly_detail.html" >> >> Now I want in my template all children of subassembly and component from >> one assembly like this: >> >> assembly1 >> * subassembly1 >> * subassembly5 >> * component5 >> * component7 >> * component8 >> * subassembly6 >> * component7 >> * component8 >> * component1 >> * component2 >> * subassembly2 >> * component3 >> * subassembly3 >> * subassembly6 >> * component1 >> * component2 >> * component1 >> * component3 >> >> The depth can be infinity but for now there will be only 3-5 levels. I >> don’t care if it will be Depth-first-search or Breadth-first-search. I read >> a lot about recursive common table expressions and raw queries. I haven’t >> found a way to code the logic with my complicated ManyToMany fields. >> >> I hope there is someone out there who can help me out. Maybe I have build >> up the models in a wrong way and that’s causing the problems why I am not >> able to solve it or or something else. >> >> Thank you for your help! >> > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/05da1a6f-6966-4e6c-b12a-77f2e062bb6an%40googlegroups.com.
