更新到现有数据库不起作用

Question

我有一个页面，用户可以在其中添加新的 mco 号码，当用户单击“添加 mco”按钮时，它将检索 ID，如下所示：

但是当用户添加新的 mco 编号并单击提交按钮时，它会创建另一行并且不会更新到 id 数据库中，如下所示，为什么会这样，我该如何解决这个问题？

views.py

@login_required()
def AddMCO(request, id):
    photo = get_object_or_404(Photo, id=id)
    if request.method == "POST":

        form = AddMCOForm(request.POST)
        if form.is_valid():
            mcoNum = form.cleaned_data['mcoNum']
            form.save()

            return redirect('ViewMCO')

    else:
        form = AddMCOForm()
    context = {
        "form": form,
        "photo": photo

    }
   
    return render(request, 'AddMCO.html', context, )

forms.py

class AddMCOForm(forms.ModelForm):

    mcoNum = forms.CharField(
        label='Enter MCO Number',
        widget=forms.TextInput(
            attrs={
                'class': 'form-control',
                'placeholder': 'Please enter MCO Number here..'
            }
        )
    )
    class Meta:
        model = Photo
        fields = ("mcoNum",)


    def __init__(self, *args, **kwargs):
        super(AddMCOForm, self).__init__(*args, **kwargs)
        self.fields['mcoNum'].widget.attrs.update({'class': 'form-control', 'placeholder': 'MCO Number'})
        self.fields['mcoNum'].label = ''
        self.fields['mcoNum'].help_text = ''

AddMCO.html

<!DOCTYPE html>
<html>

<head>
    <script>
      $(function () {
        $("#datetimepicker1").datetimepicker();
      });
    </script>
    <meta charset='utf-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>SCS Add MCO</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>

    <!-- CSS only -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet"
        integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>

    <!-- Font Awesome -->
    <link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">

    <!-- Moment.js -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment.min.js" integrity="sha256-VBLiveTKyUZMEzJd6z2mhfxIqz3ZATCuVMawPZGzIfA=" crossorigin="anonymous"></script>

    <!-- Tempus Dominus Bootstrap 4 -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/tempusdominus-bootstrap-4/5.1.2/css/tempusdominus-bootstrap-4.min.css" integrity="sha256-XPTBwC3SBoWHSmKasAk01c08M6sIA5gF5+sRxqak2Qs=" crossorigin="anonymous" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/tempusdominus-bootstrap-4/5.1.2/js/tempusdominus-bootstrap-4.min.js" integrity="sha256-z0oKYg6xiLq3yJGsp/LsY9XykbweQlHl42jHv2XTBz4=" crossorigin="anonymous"></script>


</head>
<body class="m-5">
    <div class="container">
        <div class="row justify-content-center">
            <div class="col-md-4">
                <h3>Add MCO Number</h3>

                <a href="{% url 'ViewMCO' %}" class="btn btn-dark my-3">Go Back</a>
                <div class="card" style="width: 400px">


                     <form  method="post">
                    {% csrf_token %}

                        <div class="form-group m-3">

                            <br>
                            {{ form.as_p}}
                        </div>





                        <button type='submit' class="btn btn-primary m-3">Submit</button>

                    </form>
                </div>
            </div>
        </div>
    </div>
</body>

</html>

models.py

class Photo(models.Model):
    STEP1 = "Reception"
    STEP2 = "Launching"

    STATUS = (
        (STEP1, 'Reception'),
        (STEP2, 'Launching'),

    )

    Datetime = models.DateTimeField(auto_now_add=True)
    mcoNum = models.TextField() #mcoNum stand for MCO number
    serialno = models.TextField()  # serialno stand for serial number
    partno = models.TextField()  # partno stand for part number
    reception = models.TextField()
    Customername = models.TextField() #Custoner Name
    status = models.CharField(max_length=20, choices=STATUS, default=STEP1, editable=False)

    def __str__(self):
        return self.reception

Answer 1

你没有提到Django版本和使用的数据库。

看看这是否对您有帮助。

Answer 2

假设照片模型将 addMCO Form 作为模型表单，您当然不会将实例传递给表单。

@login_required()
def AddMCO(request, id):
    photo = get_object_or_404(Photo, id=id)
    if request.method == "POST":

        form = AddMCOForm(request.POST, instance=photo)
        if form.is_valid():
            mcoNum = form.cleaned_data['mcoNum']
            form.save()

            return redirect('ViewMCO')

    else:
        form = AddMCOForm(instance=photo)
    context = {
        "form": form,
        "photo": photo

    }


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

更新到现有数据库不起作用

Update into existing database not working

html

django

django-templates

django-forms

django-views