如何更新许多领域？

Question

实验室课程

class Lab(models.Model):
    laboratory = models.CharField(max_length=50, unique=True)
    group = models.ForeignKey(Lab_Group, on_delete=models.CASCADE)

LabRequest类

class LabRequest(models.Model):
    ticket = models.ForeignKey(Ticket, on_delete=models.CASCADE)
    lab_test = models.ManyToManyField(Lab)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

这就是我保存数据时的样子

@login_required
def LabRequestToGenerateView(request, pk):
    lab_group = ''
    doctor = Doctor.objects.filter(user_id=request.user.id, active='Yes')
    for doc in doctor:
        ticket = get_object_or_404(
            Ticket, pk=pk, has_cancelled=0, is_active=0, doctor=doc.id)
        lab_group = Lab_Group.objects.all()
        if request.POST.getlist('lab_test'):
            lab_test = request.POST.getlist('lab_test')
            laboratory = Lab.objects.filter(id__in=lab_test)
            lab_test_id = LabRequest.objects.filter(examined=0, paid=0, lab_test__in=lab_test, ticket__patient=ticket.patient.id)
            if lab_test_id:
                messages.success(
                     request, 'Some lab tests have not been examined.')
                return redirect('/dashboard/lab-request')
            else:
                instance = LabRequest.objects.create(
                    ticket=ticket, created_by=request.user.id)
                instance.lab_test.add(*laboratory)
                messages.success(
                    request, 'Lab Request has been sent successfully.')
                return redirect('/dashboard/lab-request')
    context = {
        'title': 'Laboratory Request',
        'valueBtn': 'Save',
        'lab_group': lab_group
    }
    return render(request, 'dashboard/laboratory_request.html', context)

这是我尝试更新LabRequest类的方式，但由于我不知道如何更新，因此还不完整：

@login_required
def LabRequestUpdateView(request, pk):
    doctor = Doctor.objects.filter(user_id=request.user.id, active='Yes')
    for doc in doctor:
        lab_request_id = get_object_or_404(LabRequest, pk=pk, ticket__doctor=doc.id)

    context = {
        'title': 'Update Request Lab',
        'valueBtn': 'Update',
        'lab_request_id': lab_request_id
    }
    return render(request, 'dashboard/laboratory_request.html', context)

这是我的模板，我使用相同的模板保存数据

<form action="." method="POST">
    {% csrf_token %}
    <div class="row">
        {% for lab_group in lab_group %}
        <div class="col-3 border">
            <label for="">{{ lab_group|upper }}</label>
            {% for lab in lab_group.lab_set.all %}
            {% if lab.active == 'Yes' %}
            <div class="form-check">
                <input type="checkbox" value="{{ lab.id }}" name="lab_test">
                {{ lab }}
            </div>
            {% endif %}
            {% endfor %}
        </div>
        {% endfor %}

    </div>
    <div class="form-group float-right">
        <button type="submit" name="submit" class="btn btn-success btn-sm" value=" {{ valueBtn }} "> <i
                class="fa fa-save"></i>
            Save</button>
    </div>
</form>

因此，我想更新 LabRequest 类模型，但是我不知道如何使用，在尝试更新时我一直在使用Forms.py，但这很容易，但是这种方式是新的对我来说。