django实现将后台model对象转换成json对象并传递给前端jquery

sqlOrder = get_object_or_404(SqlOrder,id=request.GET.get("id"))
objJson = serialize('json',[sqlOrder])[1:-1]
{"model": "sqlapply.sqlorder", "pk": 2, "fields": {"work_id": "{now}{_ran}", "username": "admin", "status": 3, "type": 0, "backup": 0}}

 $.ajax({
      url: "{% url 'sqlapply:auditSqlOrder' %}",
      type:"GET",
      data:{"id":id,"args":"getObjById"},
      success:function(result){
        res = jQuery.parseJSON(result);  #关键代码！！！！解析一个 JSON 字符串'{"name":"John"}'为Json对象。
        if (res["statcode"] == "1") {
          objStr = res["data"];
          console.log(objStr["fields"]["username"]);#获取方式1
      alert(objStr.fields.username);#获取方式2
        }
      },
      error:function(){
        alert("访问异常，请截图联系管理员 \t\n ErrorNO:auditSqlOrder.getObjById")
      }
    });

class SysRole(models.Model):
  id = models.CharField(db_column='ID', primary_key=True, max_length=50) # Field name made lowercase.
  rolename = models.CharField(db_column='RoleName', max_length=50) # Field name made lowercase.
  description = models.CharField(db_column='Description', max_length=200, blank=True, null=True) # Field name made lowercase.
  querycode = models.CharField(db_column='QueryCode', max_length=200, blank=True, null=True) # Field name made lowercase.
  isdisabled = models.CharField(db_column='IsDisabled') # Field name made lowercase. This field type is a guess.
 
  def __unicode__(self):
    return self.rolename
  # 将属性和属性值转换成dict 列表生成式
  def toDict(self):
    return dict([(attr, getattr(self, attr)) for attr in [f.name for f in self._meta.fields]])#type(self._meta.fields).__name__
  class Meta:
    managed = False
    db_table = 'sys_role'

# 遍历查询集 调用model属性转换成dict
def queryset_to_json(queryset):
    obj_arr=[]
    for o in queryset:
        obj_arr.append(o.toDict())
    return obj_arr

  # 获取角色分页列表
  def get_roles_page(self,_page,_limit):
    _roles = SysRole.objects.all()[(int(_page)-1)*int(_limit):int(_page)*int(_limit)]
    _count = SysRole.objects.all().count()
    _dict_roles = tools.queryset_to_json(_roles)
    _data_page_json = {}
    _data_page_json['Rows']=_dict_roles
    _data_page_json['Total']=_count
    return json.dumps(_data_page_json,ensure_ascii=False)