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Explicitly mention the required usage of "memo" (#598)

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thatguysimon 2022-12-18 18:38:12 -08:00 committed by GitHub
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docs/providers/custom.rst
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@ -16,8 +16,8 @@ To create a custom provider you need to follow these rules:
1. New provider class should inherit :py:class:`Provider`. 1. New provider class should inherit :py:class:`Provider`.
2. You need to implement the ``Provider._provide()`` method. 2. You need to implement the ``Provider._provide()`` method.
3. You need to implement the ``Provider.__deepcopy__()`` method. It should return an 3. You need to implement the ``Provider.__deepcopy__()`` method. It should return an
equivalent copy of a provider. All providers must be copied with a ``deepcopy()`` function equivalent copy of a provider. All providers must be copied with the ``deepcopy()`` function
from the ``providers`` module. After the a new provider object is created use from the ``providers`` module. It's essential to pass ``memo`` into ``deepcopy`` in order to keep the preconfigured ``args`` and ``kwargs`` of stored providers. After the a new provider object is created, use
``Provider._copy_overriding()`` method to copy all overriding providers. See the example ``Provider._copy_overriding()`` method to copy all overriding providers. See the example
below. below.
4. If new provider has a ``__init__()`` method, it should call the parent 4. If new provider has a ``__init__()`` method, it should call the parent
@ -33,7 +33,7 @@ To create a custom provider you need to follow these rules:
.. note:: .. note::
1. Prefer delegation over inheritance. If you choose between inheriting a ``Factory`` or 1. Prefer delegation over inheritance. If you choose between inheriting a ``Factory`` or
inheriting a ``Provider`` and use ``Factory`` internally - the last is better. inheriting a ``Provider`` and use ``Factory`` internally - the last is better.
2. When create a new provider follow the ``Factory``-like injections style. Consistency matters. 2. When creating a new provider follow the ``Factory``-like injections style. Consistency matters.
3. Use the ``__slots__`` attribute to make sure nothing could be attached to your provider. You 3. Use the ``__slots__`` attribute to make sure nothing could be attached to your provider. You
will also save some memory. will also save some memory.