TypeError： <lambda> （）缺少1個必需的位置參數：

Question

我正在嘗試使用factory_boy和faker用一些隨機數據填充Django項目。 但是，當我嘗試創建UserFactory對象的實例時，出現錯誤TypeError：（）缺少1個必需的位置參數：'a'。

似乎與fake_date和date_joined屬性及其lambda函數有關。 我發現的一些教程已經使用lambda函數以這種方式對Factory對象進行了布局，但是它對我不起作用。

import datetime
import factory
import faker
from dataStoreApp.models import Category, Goal, Transaction
from django.contrib.auth.models import User

fake = faker.Faker()


class CategoryFactory(factory.django.DjangoModelFactory):

    class Meta:
        model = Category

    name = factory.Iterator(['Category1', 'Category2',
                             'Category3', 'Category4',
                             'Category5', ], cycle=False)


class UserFactory(factory.django.DjangoModelFactory):
    FACTORY_HIDDEN_ARGS = ('fake_date', )

    class Meta:
        model = User

    fake_date = factory.LazyAttribute(
    lambda a: datetime.datetime.now().strftime("%Y-%m-%d %H:%M"))
    date_joined = factory.LazyFunction(lambda a: a.fake_date)
    first_name = factory.LazyAttribute(lambda b: fake.first_name())
    last_name = factory.LazyAttribute(lambda c: fake.last_name())
    email = factory.LazyAttribute(lambda e: 'test' + '@test_email.com')



class GoalFactory(factory.DjangoModelFactory):
    class Meta:
        model = Goal


class TransactionFactory(factory.django.DjangoModelFactory):
    class Meta:
        model = Transaction

在python控制台中運行時，出現以下錯誤：

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "C:\Program Files\Python36\lib\site-packages\factory\base.py", line 568, in create
    return cls._generate(enums.CREATE_STRATEGY, kwargs)
  File "C:\Program Files\Python36\lib\site-packages\factory\base.py", line 505, in _generate
    return step.build()
  File "C:\Program Files\Python36\lib\site-packages\factory\builder.py", line 272, in build
    step.resolve(pre)
  File "C:\Program Files\Python36\lib\site-packages\factory\builder.py", line 221, in resolve
    self.attributes[field_name] = getattr(self.stub, field_name)
  File "C:\Program Files\Python36\lib\site-packages\factory\builder.py", line 363, in __getattr__
    extra=declaration.context,
  File "C:\Program Files\Python36\lib\site-packages\factory\declarations.py", line 59, in evaluate
    return self.function()
TypeError: <lambda>() missing 1 required positional argument: 'a'

Answer 1

您在代碼中使用參數a創建函數

lambda a: ....

但似乎程序期望函數不帶參數

lambda: ...