That does seem like an unintentional bug, since the code is forming a
string under the condition "if file_hash is not None:".

On Sun, 25 Nov 2018 at 03:26, Richard Campen <richard.cam...@gmail.com>
wrote:

> Hello
>
> I am currently looking at implementing a custom file hashing function when
> using the ManifestFilesMixin class to provide white list based file hashing
> of static files.
>
> In the process I have found what seems to be an unintended result of
> returning `None` from a custom `file_hash()` function when using the mixin.
> Looking at the original ticket
> <https://github.com/django/django/commit/5f75ac91df2ef1c19946f65e08aa50165f061cd4>
> that resulted in the refactoring of the file hashing into it's own function
> (for the explicit intention of enabling custom algorithms when using the
> mixin) there is no indication of intent for the current behaviour.
>
> Essentially, when returning a string from a custom` file_hash()`
> implementation, the resulting file name is
> `<file_path>.<custom_hash>.<ext>` as expected, whereas returning `None`
> results in `<file_path>None.<ext>`
>
> The fact that the string `None` appears in the file name seems
> undesirable, and the fact it occurs without a preceding `.` (inconsistent
> with the filename structure when a string is returned) suggests to me it is
> unintentional.
>
> I have my own fix to this locally that leaves the file name untouched if
> `file_hash()` returns `None`. Before going through the process of starting
> a ticket etc. I was curious if anyone had any thoughts on the intent of
> injecting `None` into the file name. Bug or feature.
>
> Cheers
> Richard
>
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-- 
Adam

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