[rtags] Allow to 'derive' rtags Since some releases, rtags (structure underlying uicfg) have selector and may be copied using something like: new_rtags = deepcopy(original_rtags) new_rtags.__module__ = __name__ new_rtags.__select__ = custom_selector The problem is that starting from that, both rtags wil diverge and changes in original_rtags won't be considered, while we usually want to set a few specific rules only in new_rtags. To fix this problem, this cset introduces the notion of "derivated/parent" rtag, eg: new_rtags = original_rtags.derive(__name__, custom_selector) Beside easier copying, when using the above method changes in original_rtags which are not overriden by new_rtags will be considered since it only hold its specific rules but look among its parent chain for non-found keys. Along the way, flake8 unittest_rtags. Closes #16164880

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from __future__ import absolute_import

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from pyramid.view import view_config

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from cubicweb.pyramid.resources import EntityResource, ETypeResource

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@view_config(

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    route_name='cwentities',

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    context=EntityResource,

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    request_method='DELETE')

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def delete_entity(context, request):

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    context.rset.one().cw_delete()

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    request.response.status_int = 204

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    return request.response

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def includeme(config):

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    config.add_route(

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        'cwentities', '/{etype}/*traverse',

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        factory=ETypeResource.from_match('etype'), match_is_etype='etype')

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    config.scan(__name__)