[entity] ensure the .related(entities=False) parameter is honored all the way down (closes #2755994) As of today, such a call will always fill the relation cache by calling .entities() on every single related rset entry. As a consequence, the `limit` parameter handling also had to be fixed. It was bogus in the following ways: * not used in the related_rql, hence potentially huge database requests, but also actually * foolishly used in the .entities()-calling cache routine we now bypass (this changeset ticket's main topic) Now: * we set a limit on the rql expression, and * forbid caching if given a non-None limit (as we don't want to make the cache handling code more complicated than it is already) With this, entity.unrelated gets a better limit implementation (so the code in related/unrelated is nice and symmetric) Risk: * _cw_relation_cache disappears completely, which is good, but this is Python, so you never know ...

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# Run all scenarii found in windmill directory

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from os.path import join, dirname

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from cubicweb.devtools.cwwindmill import (CubicWebWindmillUseCase,

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                                          unittest_main)

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class CubicWebWindmillUseCase(CubicWebWindmillUseCase):

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    #test_dir = join(dirname(__file__), "windmill/test_edit_relation.py")

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    pass

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if __name__ == '__main__':

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    unittest_main()