As per [their blog post of the 27th April](https://blog.readthedocs.com/securing-subdomains/) ‘Securing subdomains’:
> Starting today, Read the Docs will start hosting projects from subdomains on the domain readthedocs.io, instead of on readthedocs.org. This change addresses some security concerns around site cookies while hosting user generated data on the same domain as our dashboard.
Test Plan: Manually visited all the links I’ve modified.
I've added a save_and_refresh function to allow objects to be saved
and then updated from the database, replicating the refresh_from_db
method that exists in Django 1.8, and wrapping in the save method.
I've updated the `BaseSemVerField` method `get_prep_value` so that it
will return None when the field value is None, rather than the string
representation 'None'. Previously this would break the ORM, which would
save the string 'None' into the database, and then attempt to parse that
as a version number. This change means that the default empty value for
both VersionField and SpecField is None. Both derive from CharField,
which uses an empty string as its default empty value, however it seems
more logical in the case of these objects that no object is null, and
not an empty string.
Includes tests.
SemVer 2.0.0 states that "Build metadata SHOULD be ignored when
determining version precedence".
This means that, when comparing ``0.1.0+1`` to ``0.1.0+bcd``::
>>> Version('0.1.0+1') == Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') != Version('0.1.0+bcd')
True
>>> Version('0.1.0+1') < Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') > Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') <= Version('0.1.0+bcd')
False
>>> Version('0.1.0+1') >= Version('0.1.0+bcd')
False
>>> compare(Version('0.1.0+1'), Version('0.1.0+bcd'))
NotImplemented
This change also has the following effects:
- When including build metadata in a ``Spec``, the only valid options
are ``Spec('==0.1.0+sth')`` and ``Spec('!=0.1.0+sth')``
- The meaning of ``Spec('==0.1.0+')`` is now "Only version 0.1.0 without
build metadata"
- ``Spec('==0.1.0')`` now matches ``Version('0.1.0+anything')``