我试图使用工厂男孩和骗子生成一些虚假的数据为我的网站建设。这是我的models.py:
# External Imports
from django.db import models
import uuid
# Internal Imports
from applications.models.application import Application
from users.models.user import User
from .session import Session
# Fake data
import factory
import factory.django
import factory.fuzzy
from datetime import datetime
from faker import Faker
from faker.providers import BaseProvider
import random
class ButtonClick(models.Model):
"""**Database model that tracks and saves button clicks for an application**
"""
# identifier
id = models.UUIDField(default=uuid.uuid4, primary_key=True, editable=False)
# info
button_name = models.CharField(max_length=128, null=True, blank=True)
application = models.ForeignKey(
Application, related_name='button_clicks', null=True, blank=True, on_delete=models.CASCADE)
user = models.ForeignKey(
User, related_name='button_clicks', null=True, blank=True, on_delete=models.CASCADE)
session = models.ForeignKey(
Session, related_name='button_clicks', null=True, blank=True, on_delete=models.CASCADE)
timestamp = models.DateTimeField(auto_now=True)
class Meta:
db_table = 'button_clicks'
ordering = ('-timestamp', )
def __str__(self):
return f'{self.application} - {self.button_name}'
fake = Faker()
faker = Factory.create()
class ApplicationFactory(factory.DjangoModelFactory):
class Meta:
model = Application
application = factory.LazyAttribute(lambda _: faker.word())
class FakeButtonClick(factory.django.DjangoModelFactory):
class Meta:
model = ButtonClick
button_name = factory.Faker('first_name')
application = factory.SubFactory(ApplicationFactory)
user = factory.Faker('name')
session = factory.Faker('random_int')
timestamp = factory.Faker('date')
当我尝试在终端中运行以下代码时,出现错误:
>>> from analytics.models.button_click import FakeButtonClick
>>> for _ in range(200): FakeButtonClick.create()
...
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/factory/base.py", line 564, in create
return cls._generate(enums.CREATE_STRATEGY, kwargs)
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/factory/django.py", line 141, in _generate
return super(DjangoModelFactory, cls)._generate(strategy, params)
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/factory/base.py", line 501, in _generate
return step.build()
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/factory/builder.py", line 279, in build
kwargs=kwargs,
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/factory/base.py", line 315, in instantiate
return self.factory._create(model, *args, **kwargs)
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/factory/django.py", line 185, in _create
return manager.create(*args, **kwargs)
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/django/db/models/query.py", line 431, in create
obj = self.model(**kwargs)
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/django/db/models/base.py", line 482, in __init__
_setattr(self, field.name, rel_obj)
File "/Users/ryan/bloks/bloks-backend/venv/lib/python3.7/site-packages/django/db/models/fields/related_descriptors.py", line 219, in __set__
self.field.remote_field.model._meta.object_name,
ValueError: Cannot assign "9714": "ButtonClick.application" must be a "Application" instance.
过去我使用factory boy和faker创建了一些非常简单的数据,但是回溯似乎意味着我需要在FakeButtonClick类中创建一个应用程序实例?我检查了文档,应用程序似乎不是factory boy/faker的可用实例。我需要自己创建实例吗?也许是一家小工厂
这是我的数据库填充文件,可能会对您有所帮助(我相信比您的文件简单得多):
您的
ButtonClick
模型有3个字段定义为ForeignKey
:application
、user
和session
当您想要创建
ButtonClick
实例时,Django要求您为定义为ForeignKey的每个字段提供一个有效值-在这里,这意味着提供模型实例或None
(因为这些ForeignKey可以为空)对于FactoryBoy,这意味着您必须:
Factory
类李>factory.SubFactory
李>例如:
你可以看看at the docs
顺便说一下,使用FactoryBoy的faker integration,您不需要直接导入:
factory.Faker('uuid4')
相当于faker.Faker().uuid4()
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