# 重写formfield_for_dbfield，设计add和edit表单
  def formfield_for_dbfield(self, db_field, **kwargs):
    if not self.request.user.is_superuser:
     # 对case这个表项的下拉框选择进行过滤
      if db_field.name == "case": 
        kwargs["queryset"] = Case.objects.filter(case_owner=self.request.user).order_by('id')                        
      # 对assigned_recipient这个表项的下拉选择进行过滤
      # 并且需要用到外键
      if db_field.name == "assigned_recipient":
        stu_ids = StudentDoctor.objects.filter(doctor=self.request.user).values('student_id')
        ids = []
        # 这里使用循环，为了下方再次查询时在list中使用in
        for id in stu_ids:
          ids.append(id['student_id'])
  # 根据主键在ids列表中查询得到Queryset。注意kwargs["queryset"]一定是queryset
        kwargs["queryset"] = User.objects.filter(pk__in=ids)
      return db_field.formfield(**dict(**kwargs))

    else:
      attrs = self.get_field_attrs(db_field, **kwargs)
      return db_field.formfield(**dict(attrs, **kwargs))

<label class="control-label col-md-3 col-sm-3 col-xs-12" for="first-name">角色<span class="required"></span>
</label>
<select name="name">
  {% for name in data_list %}
  <option id="name" value="{{ name }}">{{ name }}</option>
  {% endfor %}
</select>