笔记：django get方法的异常

.
.
.
if num == 1:
    return clone._result_cache[0]
if not num:
    raise self.model.DoesNotExist(
        "%s matching query does not exist." %
        self.model._meta.object_name
    )
raise self.model.MultipleObjectsReturned(
    "get() returned more than one %s -- it returned %s!" %
    (self.model._meta.object_name, num)
)
.
.
.
以上代码截自query.py中的get方法
可见
当取不到记录时抛出 模型类名.DoesNotExist异常

当取到多条记录时抛出 模型类名.MultipleObjectsReturned异常

def post(self,request):
    depname = request.POST.get('depname')
    parentdepid = request.POST.get('seldep')
    if not depname:
        return render(request, 'depinfo.html', {'err': '部门名称不能为空'})
    try:
        parentdep = models.Dept.objects.get(id=parentdepid)
    except models.Dept.DoesNotExist:
        dep = models.Dept.objects.create(depname=depname)
    else:
        dep = models.Dept.objects.create(depname=depname,parentdep=parentdep)
    return redirect(reverse('user:adddep'))