Remove nose/rednose from `setup_requires` and instead declare them in
`tests_require`. Also explicitly add `nose` and `rednose` to
dependencies list in tox.ini (to avoid breaking test runs).
`python setup.py nosetests` is the preferred way for running tests, and
this works, except that placing test deps (nose/rednose) in the
`setup_requires` also means that these dependencies are pulled in for
installs of mongoengine. These deps are not actually be required just
to run mongoengine, so setup.py should not force users to install these
dependencies.
This refactoring should not change any test run semantics.
When I first tried to use the `reverse_delete_rule` feature of
`ReferenceField`, I had to dig through the source code to find what the
actual integer values were expected to be for DO_NOTHING, NULLIFY,
CASCADE, DENY, and PULL (or at least, where these constants were defined
so that I could import and use them). This patch adds the integer values
for those constants (which are defined in mongoengine.queryset.base) to
the docs so that users can easily choose the correct integer value.
Note: A possible improvement on this change would be to include
`mongoengine.queryset.base` module documentation in the generated docs,
and then update the `ReferenceField` docs to link to the documentation
of these constants (DO_NOTHING, NULLIFY, etc.).
Lars Butler