[entity] add an official ``cw_etype`` property for entity
This property holds the CWEtype id of the entity. This information was previously
available through __regid__ but this is an ugly public API. So we have a new
clean public API. The ``dc_type()`` method could not be used as it is
translated.
(closes #2793792)
try:
rtype, = __args__
except ValueError:
print 'USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>'
print
graph = {}
for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):
graph.setdefault(fromeid, []).append(toeid)
from logilab.common.graph import get_cycles
for cycle in get_cycles(graph):
print 'cycle', '->'.join(str(n) for n in cycle)