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...
guitard...@gmail.com 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 cryp...@gmail.com 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!
>>
>
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