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diff --git a/docs/introduction.rst b/docs/introduction.rst index d00154d..9a16c39 100644 --- a/docs/introduction.rst +++ b/docs/introduction.rst @@ -117,6 +117,35 @@ This is achieved with the :class:`~factory.Sequence` declaration: return 'user%d' % n +LazyFunction +------------ + +In simple cases, calling a function is enough to compute the value. If that function doesn't depend on the object +being built, use :class:`~factory.LazyFunction` to call that function; it should receive a function taking no +argument and returning the value for the field: + +.. code-block:: python + + class LogFactory(factory.Factory): + class Meta: + model = models.Log + + timestamp = factory.LazyFunction(datetime.now) + +.. code-block:: pycon + + >>> LogFactory() + <Log: log at 2016-02-12 17:02:34> + + >>> # The LazyFunction can be overriden + >>> LogFactory(timestamp=now - timedelta(days=1)) + <Log: log at 2016-02-11 17:02:34> + + +.. note:: For complex cases when you happen to write a specific function, + the :meth:`~factory.@lazy_attribute` decorator should be more appropriate. + + LazyAttribute ------------- |