django - 工厂男孩 : define field that depends on other field

Question

如何使用 factory-boy 定义依赖于其他字段的字段?

例如，我想定义一个 email这取决于 first name和 last name的 User .

我尝试使用 post_generation装饰器。但是，我的系统需要在创建实例之前定义电子邮件。

Answer 1

使用 LazyAttribute :

from the docs:

The LazyAttribute is a simple yet extremely powerful building brick for extending a Factory.

It takes as argument a method to call (usually a lambda); that method should accept the object being built as sole argument, and return a value.

class UserFactory(factory.Factory):
    class Meta:
        model = User

    username = 'john'
    email = factory.LazyAttribute(lambda o: '%s@example.com' % o.username)

或 lazy_attribute装饰器。

from the docs:

If a simple lambda isn’t enough, you may use the lazy_attribute() decorator instead.

This decorates an instance method that should take a single argument, self; the name of the method will be used as the name of the attribute to fill with the return value of the method:

class UserFactory(factory.Factory)
    class Meta:
        model = User

    name = u"Jean"

    @factory.lazy_attribute
    def email(self):
        # Convert to plain ascii text
        clean_name = (unicodedata.normalize('NFKD', self.name)
                        .encode('ascii', 'ignore')
                        .decode('utf8'))
        return u'%s@example.com' % clean_name