在Django中提交时，如何防止更新模式在数据库中创建新条目？

Question

我有一个表单，可以跟踪用户进入/离开某个区域的时间。例如，如果用户进入一个区域，然后忘记“离开”该区域并试图进入另一个区域，则前一个条目将被标记为N，并且模式会提示用户输入他们认为自己离开前一个区域的“估计时间”

我遇到的问题是，模式在提交时创建了一个新条目，我不知道这是在哪里发生的，以及如何防止它。这也会导致逻辑也标记较新的条目，并且基本上只要求在一段时间内的“估计时间”

视觉解释；当有人进入某个区域时，这是第一次提交

然后在这里，我输入另一个are而不退出第一个are，条目被标记，然后由模式提示（这是在提交模式之前）。到目前为止，一切都在相应地工作

然后，当我提交模式时，会发生以下情况：

在我点击submit之后，它会一直出现并更新下一个条目，因为它也会被标记，因为在提交模式时创建了新条目。我似乎不知道如何让模态在每次提交时都不保存为新条目

我对离开区也有同样的问题，但由于逻辑相似，我只在下面输入区号。views.py中的enter_without_exit变量触发html中的模式调用

视图.py

def enter_exit_area(request):
    enter_without_exit = None
    exit_without_enter = None

    if request.method == 'POST':
        form = WarehouseForm(request.POST)
        if form.is_valid():
            emp_num = form.cleaned_data['employee_number']
            area = form.cleaned_data['work_area']
            station = form.cleaned_data['station_number']

            if 'enter_area' in request.POST:
                new_entry = form.save()
                EmployeeWorkAreaLog.objects.filter((Q(employee_number=emp_num) & Q(work_area=area) & Q(time_out__isnull=True) & Q(time_in__isnull=True)) & (Q(station_number=station) | Q(station_number__isnull=True))).update(time_in=datetime.now())

                # If employee has an entry without an exit and attempts to enter a new area, mark as an exception 'N'
                enters_without_exits = EmployeeWorkAreaLog.objects.filter(Q(employee_number=emp_num) & Q(time_out__isnull=True) & Q(time_exceptions="")).exclude(pk=new_entry.pk).order_by("-time_in")
                if len(enters_without_exits) > 0:
                    enter_without_exit = enters_without_exits[0]
                    enters_without_exits.update(time_exceptions='N')

                message = 'You have entered %(area)s' % {'area': area}
                if station is not None:
                    message += ': %(station)s' % {'station': station}
                messages.success(request, message)
                form = WarehouseForm()

    else:
        form = WarehouseForm()
    return render(request, "operations/enter_exit_area.html", {
        'form': form,
        'enter_without_exit': enter_without_exit,
        'exit_without_enter': exit_without_enter,
    })


class UpdateTimestampModal(CreateUpdateModalView):
    main_model = EmployeeWorkAreaLog
    model_name = "EmployeeWorkAreaLog"
    form_class = UpdateTimestampModalForm
    template = 'operations/modals/update_timestamp_modal.html'
    modal_title = 'Update Missing Time'

型号.py

class EmployeeWorkAreaLog(TimeStampedModel, SoftDeleteModel, models.Model):
    employee_number = models.ForeignKey(Salesman, on_delete=models.SET_NULL, help_text="Employee #", null=True, blank=False)
    work_area = models.ForeignKey(WorkArea, on_delete=models.SET_NULL, null=True, blank=False, help_text="Work Area", related_name="work_area")
    station_number = models.ForeignKey(Station, on_delete=models.SET_NULL, null=True, help_text="Station", related_name="stations", blank=True)
    edited_timestamp = models.DateTimeField(null=True, blank=True)
    time_exceptions = models.CharField(max_length=2, blank=True, default='', choices=EXCEPTION_STATUS)
    time_in = models.DateTimeField(help_text="Time in", null=True, blank=True)
    time_out = models.DateTimeField(blank=True, help_text="Time out", null=True)

forms.py

class WarehouseForm(AppsModelForm):
    class Meta:
        model = EmployeeWorkAreaLog
        widgets = {
            'employee_number': ForeignKeyRawIdWidget(EmployeeWorkAreaLog._meta.get_field('employee_number').remote_field, site, attrs={'id':'employee_number_field'}),
        }
        fields = ('employee_number', 'work_area', 'station_number')


class UpdateTimestampModalForm(AppsModelForm):
    def __init__(self, *args, **kwargs):
        super(UpdateTimestampModalForm, self).__init__(*args, **kwargs)
        self.fields['edited_timestamp'].widget.format = '%m/%d/%Y %I:%M %p'
        self.fields['edited_timestamp'].input_formats = ['%m/%d/%Y %I:%M %p']

    class Meta:
        model = EmployeeWorkAreaLog
        fields = ('edited_timestamp',)

    def clean_edited_timestamp(self):
        edited_stamp = self.cleaned_data.get('edited_timestamp')
        return edited_stamp

进入退出区域.html

{% extends "base.html" %}
{% load core_tags staticfiles %}
{% block head %}
    <script src="{% static "js/operations/warehouse_enter_exit.js" %}"></script>
{% endblock head %}

{% block main %}

    {% if enter_without_exit %}
        <div id="auto-open-ajax-modal" data-modal="#create-update-modal" data-modal-url="{% url "operations:update_timestamp_modal" enter_without_exit.id %}" class="hidden"></div>
    {% endif %}
    {% if exit_without_enter %}
        <div id="auto-open-ajax-modal" data-modal="#create-update-modal" data-modal-url="{% url "operations:update_timestamp_modal" exit_without_enter.id %}" class="hidden"></div>
    {% endif %}

    <form id="warehouseForm" action="" method="POST" novalidate >
        {% csrf_token %}

        <div>
            <div>
                <div>{{ form.employee_number.errors.as_text }}</div>
                <label>Employee #</label>
                {{ form.employee_number }}
            </div>

            <div>
                <div>{{ form.work_area.errors.as_text }}</div>
                <label>Work Area</label>
                {{ form.work_area }}
            </div>
            <div>{{ form.station_number.errors.as_text }}</div>
            <div>
                <label>Station</label>
                {{ form.station_number }}
            </div>
        </div>

        <div>
            <div>
                <button type="submit" name="enter_area" value="Enter">Enter Area</button>
                <button type="submit" name="leave_area" value="Leave">Leave Area</button>
            </div>
        </div>
    </form>

    {% modal id="create-update-modal" title="Update Timestamp" primary_btn="Submit" default_submit=True %}
{% endblock main %}

更新\u timestamp\u modal.html

{% load core_tags %}

<form id="create-update-form" method="post" action="{% url "operations:update_timestamp_modal" main_object.id %}">
    {% csrf_token %}

    <label>Update</label>
    <div class="row">
            <div class="form-group col-xs-6">
                {% standard_input form.edited_timestamp datetimepicker=True hide_label=True %}
            </div>
    </div>
</form>