Question

我的 models.py ：

中有以下结构方案

from django.db import models

class SensorManager(models.Manager):
    def create_sensor(self,numero,pinoFisico):
        sensor = self.create(numero = numero,
                             pinoFisico = pinoFisico,
                             ativo      = False)
        return sensor

class Sensor(models.Model):
    numero = models.IntegerField()
    pinoFisico = models.IntegerField()
    ativo = models.BooleanField()
    dataUltimoReconhecimento = models.DateTimeField()
    situacao = None
    moduloSensor = None

    #Manager
    objects = SensorManager()

    def __init__(self):
        self.moduloSensor = ModuloSensor()

并且，在 views.py 文件中，我有：

def formSensores(request):
    sensores = Sensor.objects.all()
    print sensores
    return render(request,"speedapp/monitoraSensores.html",{"sensores": sensores})

当我尝试在

中使用对象时

打印感官

我得到以下堆栈：

[17/Apr/2017 00:38:09] "GET /speedapp/ HTTP/1.1" 200 3649
Internal Server Error: /speedapp/sensores/
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/pi/Documents/speed_project/speed/speedapp/views.py", line 39, in formSensores
    print sensores
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 234, in __repr__
    data = list(self[:REPR_OUTPUT_SIZE + 1])
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 258, in __iter__
    self._fetch_all()
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 1074, in _fetch_all
    self._result_cache = list(self.iterator())
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 69, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 460, in from_db
    new = cls(*values)
TypeError: __init__() takes exactly 1 argument (6 given)
[17/Apr/2017 00:38:11] "GET /speedapp/sensores/ HTTP/1.1" 500 15557

作为堆栈，在类Sensor中的SensorManager方法中__init__()方法构建from_db对象时，似乎是一个问题。预期 N 参数...此问题与我的自定义管理器SensorManager有关？

P.S：

对于通过models.Manager使用“all（）”方法的其他对象，此错误不会发生，仅适用于此Sensor类
只有当我尝试“使用”列表对象的实例时，才会使用all()方法，例如：打印它的值
我在搜索中发现了this和this相关问题，但我无法解决他们的问题

Answer 1

所以这是高级答案。问题是您覆盖了模型上的__init__方法。你真的应该尽量避免这种情况。这是关于其他选项的一些文档;阅读绿色大注：https://docs.djangoproject.com/en/1.11/ref/models/instances/#django.db.models.Model

以下是摘录：

You may be tempted to customize the model by overriding the __init__ method...Rather than overriding __init__, try using one of these approaches 1. Add a classmethod on the model class 2. Add a method on a custom manager (usually preferred)

如果你绝对需要覆盖__init__，那么不要忘记调用super()传递值，让Django先做它的东西。

无法使用models.Manager

1 个答案: