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Merge pull request #3459 from brwr/brwr/django-23376 

Fixed #23376 -- Make documentation about required Storage methods consistent.
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Daniele Procida 2014-11-03 11:49:23 +00:00
parent 6d0547c1ad 332706eaa0
commit d968bd5258
1 changed files with 15 additions and 2 deletions
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17
docs/howto/custom-file-storage.txt
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@ -41,8 +41,8 @@ You'll need to follow these steps:
``django.utils.deconstruct.deconstructible`` class decorator for this ``django.utils.deconstruct.deconstructible`` class decorator for this
(that's what Django uses on FileSystemStorage). (that's what Django uses on FileSystemStorage).
Your custom storage system may override any of the storage methods explained in By default, the following methods raise `NotImplementedError` and will
:doc:`/ref/files/storage`, but you **must** implement the following methods: typically have to be overridden:
* :meth:`Storage.delete` * :meth:`Storage.delete`
* :meth:`Storage.exists` * :meth:`Storage.exists`
@ -50,6 +50,19 @@ Your custom storage system may override any of the storage methods explained in
* :meth:`Storage.size` * :meth:`Storage.size`
* :meth:`Storage.url` * :meth:`Storage.url`
Note however that not all these methods are required and may be deliberately
omitted. As it happens, it is possible to leave each method unimplemented and
still have a working Storage.
By way of example, if listing the contents of certain storage backends turns
out to be expensive, you might decide not to implement `Storage.listdir`.
Another example would be a backend that only handles writing to files. In this
case, you would not need to implement any of the above methods.
Ultimately, which of these methods are implemented is up to you. Leaving some
methods unimplemented will result in a partial (possibly broken) interface.
You'll also usually want to use hooks specifically designed for custom storage You'll also usually want to use hooks specifically designed for custom storage
objects. These are: objects. These are: