如何过滤Django表中显示的数据？

Question

我有一个项目，其中当用户输入车辆编号时，将过滤数据库，并显示一个包含该车辆编号和对应信息的表。我还想过滤此显示的表，例如：如果用户选择查看数量大于18kl的数量，则显示数量大于18的匹配车辆编号。我也想隐藏用户选择的列，因为有很多列。有人可以告诉我如何在Django中执行此操作，或提出一些更好的方法。 （我仅提供相关的代码段。）

forms.py

class VehicleSearch(forms.Form):
    vehicl[![enter image description here][1]][1]e_no = forms.CharField(widget=forms.TextInput(attrs={'class': 'special'}), required=False)

#filter form
class Filter(forms.Form):
    capacity_grp = forms.ChoiceField(label='Show only', widget=forms.RadioSelect,
                                     choices=[('abv', '>18 kl'), ('blw', '<18 kl')], required=False)

views.py

def search(request):
    form_1 = forms.VehicleSearch()
    if request.method == 'POST' and 'btnform1' in request.POST:
        form_1 = forms.VehicleSearch(request.POST)
        if form_1.is_valid():
            vehicle_no = form_1.cleaned_data['vehicle_no']
            transport = models.Transport.objects.filter(vehicle=vehicle_no)
            my_dict.update({'transport': transport})
    return render(request, 'search.html', my_dict)

search.html

/ 车辆形式 /

        <form id="f1" method="POST">
            {% csrf_token %}
            {{form_1.as_p}}
            <p style="padding: 10px;"><button class="myButton" name="btnform1">Search</button></p>
        </form>

/*Table display*/
<div class="submain">
    {% if transport %}
    <table id="transportation">
        <thead>
        <th>Vehicle</th>
        <th>Carrier</th>
        <th>Location No</th>
        <th>MCMU</th>
        <th>Location</th>
        <th>Customer Code</th>
        <th>Zone</th>
        <th>Quantity</th>
        <th>RTKM</th>
        <th>KL* KM</th>
        <th>Amount</th>
        <th>Load</th>
        <th>Capacity</th>
        <th>Rate</th>
        <th>Cost</th>
        </thead>
        {% for i in transport %}
        <tr class="item">
            <td>{{ i.vehicle }}</td>
            <td>{{ i.carrier }}</td>
            <td>{{ i.location_no }}</td>
            <td>{{ i.mcmu }}</td>
            <td>{{ i.location }}</td>
            <td>{{ i.customer_code }}</td>
            <td>{{ i.zone }}</td>
            <td>{{ i.quantity }}</td>
            <td>{{ i.rtkm }}</td>
            <td>{{ i.klkm }}</td>
            <td>{{ i.amount }}</td>
            <td>{{ i.load }}</td>
            <td>{{ i.capacity }}</td>
            <td>{{ i.rate }}</td>
            <td>{{ i.cost }}</td>
        </tr>
        {% endfor %}
    </table>
</div>

Answer 1

在表格显示中，您可以添加带有名称字段的循环，如下所示：

查看：

def search(request):
   form_1 = forms.VehicleSearch()
   if request.method == 'POST' and 'btnform1' in request.POST:
    form_1 = forms.VehicleSearch(request.POST)
    columns = request.POST.getlist('filter_hide_columns')
    if form_1.is_valid():
        vehicle_no = form_1.cleaned_data['vehicle_no']
        transport = models.Transport.objects.filter(vehicle=vehicle_no)
        my_dict.update({'transport': transport}, {'columns': columns})
  return render(request, 'search.html', my_dict)

TemplateTag

def lookup(model, attr):
    if hasattr(model, attr):
        return getattr(model, attr)
    else:
        return None

推荐https://docs.djangoproject.com/en/2.2/howto/custom-template-tags/

模板：

{% if transport %}
     <table id="transportation">
        <thead>
           <tr>
             {% for field in columns %}
                <th>{{ field.name }}</th>
             {% endfor %}
           </tr>
        </thead>
        <tbody>
          {% for t in transport %}
              <tr>
                 {% for field in columns %}
                     <td>{{ t|lookup:field.name }}</td>
                 {% endfor %}
              </tr>
          {% endfor %}
        </tbody>
     </table>
{% endif %}

请参阅https://docs.djangoproject.com/en/2.2/topics/forms/#looping-over-the-form-s-fields

Answer 2

要搜索车辆编号，您可以这样做。 我假设您有一个Vehicle的模型：

  

Models.py

class Vehicle(model.Model):
vehicle_no = models.IntegerField()
vehicle_weight = models.IntegerField()

  

search.html

<form action="{% url 'your_search_url' %}">
   <input type="text" name="q" placeholder="Search">
 </form>

  

在views.py

 def search(request):
   q = request.GET.get('q')
   if q:
      vechicles = Vehicle.object.filter(vehicle_no__contains=q)
      return render(request,'your_display_table.html',{'vehicles':vehicles})
   else:
       messages.info(request,'no results found for {} ',format(q))
       return redirect('your_view')

  

要过滤值大于18的数据；

def filter(request):
  vechicles = Vehicle.object.filter(vehicle_weight__gt=18)
  return render(request,'your_display_table.html',{'vehicles':vehicles})

  

在模板中，您可以这样使用：

{% for vehicle in vehicles %}
{{vehicle.name}}
{% endfor %}