无法引发 ValidationError django 验证器

Question

我需要知道如何在 django 中引发验证器的 ValidationError。

首先我在简单的页面和表单中尝试了表单上的方法，并且效果很好。

但是当我在页面中使用模态淡入淡出类与 pk 一起使用时会出现问题

例如（127.0.0.1:8000/wsheets/AMA2/）。

消息是 （视图 Home.views.wellsets 没有返回 HttpResponse 对象，而是返回了 None。）

mt views.wellsets 是

def wellsets(request, WeelN):
    serchedWl = WellSheets.objects.filter(WellID__exact=WeelN)
    form= WelshetForm()
    context ={
        'title': 'SearchWS',
        'Wellslistsh':serchedWl,
        'WeelN':WeelN,
        'form':form,
    }
    if request.method == 'POST':
        form =WelshetForm(request.POST, request.FILES)
        if form.is_valid():
            form.instance.author = request.user
            form.save()
            return redirect('WellSheetg', WeelN)
    else:
        return render(request,'Home/WELLINFO/W_TchD/wellshts.html', context)

我的表单+验证器是：

from django.core.exceptions import ValidationError
class WelshetForm(forms.ModelForm):
    WellID   = forms.CharField(label='Well Name',max_length=15)
    FileNm   = forms.CharField(label='File Name',max_length=15)
    def clean_SHRPath(self):
        SHRPath = self.cleaned_data.get('SHRPath')
        size= SHRPath._size
        if SHRPath._size > 1024*1024*10:
            raise forms.ValidationError('Size is bigger than allowed')           
        return SHRPath

最后这是我的html表单

<button type="button" class="btn button1 btn-outline-success mb-2 btn-block"  data-toggle="modal" data-target="#myModal" >
<p class="thicker">Add new Well-Sheet</p></button>

<div class="modal fade" id="myModal" role="dialog" >
  <div class="modal-dialog ">
    <div class="modal-content">
      <div class="modal-header">
        <h4 class="modal-title"><p class="thicker">Upload Well-sheet</p></h4>
          <button type="button" class="close" data-dismiss="modal">&times;</button>
      </div>

<div class="modal-body">
  <p class="thicker">Check your file before uploading ({{WeelN}})</p>
<div class="w3-panel w3-light-grey w3-round-large solid"">
  <form method="POST" id="formOne" enctype= multipart/form-data>
    {% csrf_token %}

      <div class="form-row">    
        <div class="form-group col-md-6 mb-0">
          {{ form.WellID|as_crispy_field }}  </div></div>      

      <div class="form-row">    
        <div class="form-group col-md-8 mb-0">
        {{ form.SHRPath }}</div></div>
        <p style="color:red;">Maximum upload size is 10Mb</p>
        <br>
      <input class="btn btn-success mb-6" name="form_uplod" type="submit" value="AddSheet">     
  </form>
</div>
    </div>
  </div>
    <div class="modal-footer">
    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button></div>
</div>
</div>

Modal form

Answer 1

正如@IainShelvington 所说，您需要删除 else 块才能获得响应。你可以这样尝试：

def wellsets(request, WeelN):
    serchedWl = WellSheets.objects.filter(WellID__exact=WeelN)
    form= WelshetForm()
    if request.method == 'POST':
        form =WelshetForm(request.POST, request.FILES)
        if form.is_valid():
            form.instance.author = request.user
            form.save()
            return redirect('WellSheetg', WeelN)
    context ={
        'title': 'SearchWS',
        'Wellslistsh':serchedWl,
        'WeelN':WeelN,
        'form':form,
    }
    return render(request,'Home/WELLINFO/W_TchD/wellshts.html', context)

这样，即使验证失败，您也会收到包含错误数据的表单响应。要在模板中显示表单错误，请尝试如下：

<div class="form-group col-md-8 mb-0">
{{ form.SHRPath }}</div>
{% if form.SHRPath.errors|length > 0 %}
    <p style="color:red;">{{ form.SHRPath.errors.0 }}</p>
    <br>
{% endfor %}

更多信息可以在documenation找到。