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親オブジェクトを使用して子オブジェクト/フィールド値を取得しようとしています。親は 内の変数であり、for loopに渡すことができないようですcustom tag

#custom_tags.py
@register.simple_tag()
def assigned_to(sample):
    #sample=sample.pk
    return Lab_Request.objects.filter(sample=sample).first().lab.lab_name

@register.filter()
def assigned_too(sample):
    #sample=sample.pk
    return Lab_Request.objects.filter(sample=sample).first().lab.lab_name
#sample.html
{% for sample in samples %}

                {% static sample.0|assigned_too %}

                {% if user.profile.employee.pk == sample.inspector.employee.pk or perms.ics.view_sample %}

                                    <tr>
                                        <td class="column1">{{ sample.sample_date }}</td>
                                        <td class="column2">{{ sample.status|sample_status_options }}</td>
                                        <td class="column3"><a href="#">{{ sample.sample_number }}</a></td>
                                        <td class="column4"><a href="#">{{ sample.order.customer.customer_name }}</a></td>
                                        <td class="column5"><a href="#">{{ sample.lab_request.placeholder_to_be_replaced }}{{ sample.lab_request.lab.lab_name }}{{ sample.inspection_request.inspector.employee.employee_first_name }}</a></td>
                                        <td class="column6">{{ sample.date_modified|date:'M. d, Y'  }}</td>
                                    </tr>
                {% endif %}
            {% endfor %}

{% static sample|assigned_too %}苦労している部分です。また、関数を作成して のように呼び出そうとしました{% assigned_to {{ sample }} %}。使用すると機能します{% static 1|assigned_too %}が、必要なようにループを反復しません。これを可能な限り最も複雑な方法で行っているかどうかはわかりません。{{ sample.lab_request.lab.lab_name }}どこsampleが親オブジェクトで、どこが子モデルであるかなど、親の子からの情報が必要ですlab_request

編集:

#views.py
class SampleHomeView(ListView):
    model = Sample
    samples = Sample.objects.all
    context_object_name = 'samples'
    template_name = 'ics/sample.html'
    ordering = ['-sample_date']
    paginate_by = 10
#urls.py
path('sample/', SampleHomeView.as_view(), name='sample-home'),
#models.py

class Lab_Request(models.Model):
    #Add stuff here
    placeholder_to_be_replaced = models.CharField(max_length=1)
    lab = models.ForeignKey(Lab, on_delete=models.CASCADE, null=True, blank=True)
    sample = models.ForeignKey(Sample, on_delete=models.CASCADE)

class Sample(models.Model):

    order = models.ForeignKey(Order, on_delete=models.CASCADE)
    employee = models.ForeignKey(Employee, on_delete=models.CASCADE)
    status = models.CharField(max_length=2, choices=SAMPLE_STATUS_OPTIONS, default="01")

class Order(models.Model):

    order_number = models.CharField(max_length=19, unique=True, editable=False, default=get_order_number)
    status = models.CharField(max_length=2, choices=ORDER_STATUS_OPTIONS)
    specification = models.ForeignKey(Specification, on_delete=models.CASCADE, null=True, blank=True) #Needs work to determine which spec is appropriate
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    user = models.ForeignKey(User, on_delete=models.CASCADE)

class Lab(models.Model):

    status = models.CharField(max_length=2, choices=STATUS_OPTIONS)
    lab_name = models.TextField(max_length=100, unique=True)
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