问基于dropdwon选项的Django动态视图

EN

class Income(models.Model):
        date=models.DateField('', default="GG/MM/YYYY")
        income=models.DecimalField()

<form method="post">
<div class="row">
h5>Income data collection</h5>
<div class="row">
             <div class="form-group col-2 0 mb-0" >
                 {{form.income|as_crispy_field}}
             </div>
             <div class="form-group col-2 0 mb-0" >
                 {{form.date|as_crispy_field}}
             </div>
  </div>
        <table class="table" >           
          <thead>
            <tr>
              <th>Income</th>
              <th>Date</th>
            </tr>
          </thead>
          <tbody>
              {% for inc in income%}
              <tr>
                  <td>{{inc.income}}</td>
                  <td>{{inc.date}}</td>                  
              </tr>
              {% endfor %}
          </tbody>
        </table>

income=Income.objects.filters(data__year='2020')

class Timing(models.Model):
    reference_year=models.DecimalField(max_digits=4, decimal_places=0, default="2020")