URL 参数中的默认 ModelForm 字段（外键）

Question

我有一个包含 reference_id 的 URL，此参考 ID 被传递到我的 HTML 文件以默认 ModelForm 的值。我的问题是我默认的字段 ModelForm 字段是另一个模型的外键。我目前正在这样做的方式，通过HTML文件，由于上述原因，表单没有提交。我想知道如何将此表单字段设置为默认为通过 URL 传递的参数，使其只读，并仍然将其发布到模型。在下面发布的表单中，它是我尝试默认的“参考”字段，在 HTML 中，标签是我当前的操作方式。任何想法或替代方案都非常受欢迎。

模型.PY

class Manifests(models.Model):

    reference = models.ForeignKey(Orders)
    cases = models.IntegerField()
    description = models.CharField(max_length=1000)
    count = models.IntegerField()

    def __str__(self):
        return self.cases

FORMS.PY

class CreateManifestForm(forms.ModelForm):
    class Meta:
        model = Manifests
        fields = ('reference', 'cases', 'description', 'count')

VIEWS.PY

def add_manifest(request, reference_id):

    if request.method == "POST":
        form = CreateManifestForm(request.POST)

        if form.is_valid():
            form.save()
            return redirect('add_manifest', reference_id=reference_id)

    form = CreateManifestForm()
    manifests = Manifests.objects.all()

    context = {
        'form': form,
        'reference_id': reference_id,
        'manifests' : manifests,
    }

    return render(request, 'add_manifest.html', context)

ADD_MANIFEST.HTML

  <div class="container">
    <form method="POST">

      <br>
      <br>
      {% csrf_token %}

        <div class="column">
          <label for="form.reference">Reference ID: </label><br>
          <input type="text" value="{{ reference_id }}">
          <br>
        </div>
        <div class="column">
          <label for="form.description">Description: </label>
          <br>
          {{ form.description}}
        </div>
        <div class="column">
          <label for="form.cases">Cases: </label>
          <br>
          {{ form.cases }}
          <br>
        </div>
        <div class="column">
          <label for="form.count">Count: </label>
          <br>
          {{ form.count }}
          <br>
          <br>
        </div>
          <br>
          <br>


      <button type="submit" name="add_mani" style="border-color: #7395AE;">Add Line</button>
    </form>

URLS.PY

url(r'^add_manifest/(?P<reference_id>\d+)/$', add_manifest, name='add_manifest'),

Answer 1

您可以在views.py 中修改表单将创建的实例：

# ... import the Orders model

def add_manifest(request, reference_id):

    if request.method == "POST":
        form = CreateManifestForm(request.POST)

        if form.is_valid():
            instance = form.save(commit=False)
            try:
                order = Orders.objects.get(id=reference_id)
            except Orders.DoesNotExist:
                pass  # do error handling here
            instance.reference = order
            instance.save()
            return redirect('add_manifest', reference_id=reference_id)

    form = CreateManifestForm()
    manifests = Manifests.objects.all()

    context = {
        'form': form,
        'reference_id': reference_id,
        'manifests' : manifests,
    }

    return render(request, 'add_manifest.html', context)