在发出POST请求时，Django在formset中有多个表单时抛出错误

问题描述 投票：0回答：2

我有一个带有仪表板的django项目和带有django admin内置的formsets的表单。我正在尝试从表单向API发出POST请求。我有两个特定的表单。当我在任何一个表单集中有多个表单时，我收到以下错误。然而，单一形式正在经历。下面是我的代码和错误，

Internal Server Error: /admin/campaign/add
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/django/views/decorators/cache.py", line 45, in _wrapped_view_func
    add_never_cache_headers(response)
  File "/usr/local/lib/python3.7/site-packages/django/utils/cache.py", line 252, in add_never_cache_headers
    patch_response_headers(response, cache_timeout=-1)
  File "/usr/local/lib/python3.7/site-packages/django/utils/cache.py", line 243, in patch_response_headers
    if not response.has_header('Expires'):
AttributeError: 'NoneType' object has no attribute 'has_header'

forms.朋友

class CampaignForm(forms.Form):
    consumer = forms.CharField(label="Consumer", max_length=200)
    startDate = forms.DateTimeField(label="Start Date",
        input_formats=['%d/%m/%Y %H:%M'])
    endDate = forms.DateTimeField(label="End Date",
        input_formats=['%d/%m/%Y %H:%M'])
    referreeCredits = forms.IntegerField(label="Referree Credits")
    referrerCredits = forms.IntegerField(label="Referrer Credits")
    maxReferreeCredits = forms.IntegerField(label="Max Referree Credits")
    maxReferrerCredits = forms.IntegerField(label="Max Referrer Credits")
    message = forms.CharField(label="Message", max_length=200)
    kramerTemplateId = forms.CharField(label="Kramer Template ID", max_length=200)
    paymentMode = forms.ChoiceField(label="Payment Mode", choices=[("PAYTM","PAYTM")])

class RuleForm(forms.Form):
    eventName = forms.CharField(label="Event Name", max_length=200)
    operator = forms.ChoiceField(label="Operator", choices=[("EQUAL","EQUAL"), ("EVERY","EVERY")])
    value = forms.IntegerField(label="Value")

class MilestoneRulesForm(forms.Form):
    operator = forms.ChoiceField(label="Operator", choices=[("EQUAL","EQUAL"), ("EVERY","EVERY")])
    value = forms.IntegerField(label="Value")
    referrerCredits = forms.IntegerField(label="Referrer Credits")

views.朋友

def campaign_add(self, request):
        form = CampaignForm()
        RuleFormSet = formset_factory(RuleForm)
        MilestoneFormSet = formset_factory(MilestoneRulesForm)
        if request.method == 'POST':
            # import ipdb; ipdb.set_trace()
            form = CampaignForm(request.POST)
            rule_formset = RuleFormSet(request.POST, prefix='rules')
            milestone_formset = MilestoneFormSet(request.POST, prefix='milestones')
            if form.is_valid() and rule_formset.is_valid() and milestone_formset.is_valid():
                    import ipdb; ipdb.set_trace()
                    dat = {}
                    dat["consumer"] = form.cleaned_data["consumer"]
                    dat["startDate"] = self.datetime_to_epoch(form.cleaned_data["startDate"])
                    dat["endDate"] = self.datetime_to_epoch(form.cleaned_data["endDate"])
                    dat["referreeCredits"] = form.cleaned_data["referreeCredits"]
                    dat["referrerCredits"] = form.cleaned_data["referrerCredits"]
                    dat["maxReferreeCredits"] = form.cleaned_data["maxReferreeCredits"]
                    dat["maxReferrerCredits"] = form.cleaned_data["maxReferrerCredits"]
                    dat["message"] = form.cleaned_data["message"]
                    dat["kramerTemplateId"] = form.cleaned_data["kramerTemplateId"]
                    dat["paymentMode"] = form.cleaned_data["paymentMode"]
                    arrRules = rule_formset.cleaned_data
                    arrMilestoneRules = milestone_formset.cleaned_data
                    dat["eventRules"] = arrRules
                    dat["milestoneRules"] = arrMilestoneRules
                    print(rule_formset.cleaned_data)
                    print(milestone_formset.cleaned_data)
                    res = requests.post("https://example.com", data=json.dumps(dat), headers={'content-type': 'application/json'})
                    if res.status_code == 201 or res.status_code == 200:
                        messages.success(request, 'Success!')
                        return redirect("admin:campaign-pg1")
                    else:
                        messages.error(request, 'Submission Failed.')
        else:
            rule_formset = RuleFormSet(prefix="rules")
            milestone_formset = MilestoneFormSet(prefix="milestones")
            return TemplateResponse(request, "admin/campaign_add.html", {"form":form, "rule_formset": rule_formset, "milestone_formset": milestone_formset})

Html模板：

{% block content %}
    <div class="form_div" style="width:60%;">
        <h2>Campaign Form</h2>
        <form method="POST">
            {% csrf_token %}
            {% for field in form.visible_fields %}
                <div class="form-group">
                    {{ field.label_tag }}
                    {% render_field field class="form-control" %}
                    {% if field.help_text %}
                        <small class="form-text text-muted">{{ field.help_text }}</small>
                    {% endif %}
                </div>
            {% endfor %}            
            <div style="display: flex; justify-content: space-between; width: 280px;">
                <h3>Rules</h3>
                <button type="button" id="generate-rule" class="btn btn-primary">+</button>
            </div>
            <div class="parent">
            <div>
            {{ rule_formset.management_form }}
            {% for ruleForm in rule_formset %}
                {{ ruleForm }}
                <input type="button"  class="btn btn-warn" style="background: red;" value="-">
            {% endfor %}
            </div>
            </div>
             <div style="display: flex; justify-content: space-between; width: 280px;">
                <h3>Milestone Rules</h3>
                <button  type="button" id="generate-milestone-rule" class="btn btn-primary">+</button>
            </div>
            <div class="milestone-parent">
            <div>
            {{ milestone_formset.management_form }}
            {% for milestoneForm in milestone_formset %}
                {{ milestoneForm }}
                <input type="button"  class="btn btn-warn" style="background: red;" value="-">
            {% endfor %}
            </div>
            </div>
            <div>
            <input type="submit" value="Post">
            </div>
        </form>
    </div>

    <script>
        $(function () {
            $("#id_startDate").datetimepicker({
            format: 'd/m/Y H:i',
            });
            $("#id_endDate").datetimepicker({
            format: 'd/m/Y H:i',
            });
        });
    </script>

    <script type='text/javascript'>

        const ruleform = `
        <div>
            <label for="id_rules-{n}-eventName">Event Name:</label>
            <input type="text" name="rules-{n}-eventName" maxlength="200" id="id_rules-{n}-eventName">

            <label for="id_rules-{n}-operator">Operator:</label>
            <select name="rules-{n}-operator" id="id_rules-{n}-operator">
                <option value="EQUAL">EQUAL</option>
                <option value="EVERY">EVERY</option>
            </select>

            <label for="id_rules-{n}-value">Value:</label>
            <input type="number" name="rules-{n}-value" id="id_rules-{n}-value">
            <input type="button" class="btn btn-warn" style="background: red;" value="-">
        </div>
        `
        const milestoneform = `
        <div>
            <label for="id_milestones-{n}-operator">Operator:</label>
            <select name="milestones-{n}-operator" id="id_milestones-{n}-operator">
                <option value="EQUAL">EQUAL</option>
                <option value="EVERY">EVERY</option>
            </select>

            <label for="id_milestones-{n}-value">Value:</label>
            <input type="number" name="milestones-{n}-value" id="id_milestones-{n}-value">

            <label for="id_milestones-{n}-mreferrerCredits">Referrer Credits:</label>
            <input type="number" name="milestones-{n}-mReferrerCredits" maxlength="200" id="id_milestones-{n}-mReferrerCredits">

            <input type="button" class="btn btn-warn" style="background: red;" value="-">
        </div>
        `
        $("#generate-rule").on('click', function(e){
            var n = $("#id_rules-TOTAL_FORMS").val(); // current number of forms;
            var new_form = ruleform.replace(/{n}/g, n); // replace all {n} by the new form number
            $(".parent").append(new_form);
            $("#id_rules-TOTAL_FORMS").val(parseInt(n) + 1); // update the total forms number
            console.log($("#id_rules-TOTAL_FORMS").val());
        })
        $("#generate-milestone-rule").on('click', function(e){
             var n = $("#id_milestones-TOTAL_FORMS").val(); // current number of forms;
            var new_form = milestoneform.replace(/{n}/g, n); // replace all {n} by the new form number
            $(".milestone-parent").append(new_form);
            $("#id_milestones-TOTAL_FORMS").val(parseInt(n) + 1); // update the total forms number
            console.log($("#id_milestones-TOTAL_FORMS").val());
        })
        $(".parent").on("click", (e) => {
            //n = $("#id_rules-TOTAL_FORMS").val();
            //$("#id_rules-TOTAL_FORMS").val(parseInt(n)-1);
            //console.log($("#id_rules-TOTAL_FORMS").val());
            return e.target.classList.contains('btn-warn') && e.target.parentNode.remove()
        })

        $(".milestone-parent").on("click", (e) => {
            //n = $("#id_milestones-TOTAL_FORMS").val();
            //$("#id_milestones-TOTAL_FORMS").val(parseInt(n)-1);
            //console.log($("#id_milestones-TOTAL_FORMS").val());
            return e.target.classList.contains('btn-warn') && e.target.parentNode.remove()
        })
    </script>
{% endblock %}

如何解决此错误，以便我可以在我的表单集中使用任意数量的表单发出POST请求？

编辑：这是我的formset的样子。当我有多个表单时，我收到上述错误。 my formsets

django django-forms
2个回答
0
投票

可能是您达到了一个条件，您的请求的状态代码无效（不是200或201）？在这种情况下，您没有返回任何响应，您只是在调用：

else:
    messages.error(request, 'Submission Failed.')

您的异常的堆栈跟踪表明没有响应对象（您没有从视图返回任何响应）

File "/usr/local/lib/python3.7/site-packages/django/utils/cache.py", line 243, in patch_response_headers
    if not response.has_header('Expires'):
AttributeError: 'NoneType' object has no attribute 'has_header'

检查api调用失败的原因并解决问题然后您应该能够提交表单。

0
投票

默认情况下，formset_factory（）定义一个额外的表单。显示的空表单数由extra参数控制。

MilestoneFormSet = formset_factory(MilestoneForm, extra=2)
RuleFormSet = formset_factory(RuleForm, extra=2)
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