[migration] hackish black magic to bootstrap addition of formula attr during migration Turns out we can't add an attribute to CWAttribute before the attribute exists. add_attribute generates rql with a 'formula' relation, which CW doesn't know about yet, so things get unhappy. Once that is fixed, we need to make the CWAttribute addition operation deal with CWAttribute entities that don't have a formula yet. Finally, move the migration to bootstrapmigration_repository so it happens early on, and use add_entity_type rather than add_relation_type for CWComputedRType.

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try:

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    rtype, = __args__

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except ValueError:

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    print 'USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>'

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    print

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graph = {}

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for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):

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    graph.setdefault(fromeid, []).append(toeid)

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from logilab.common.graph import get_cycles

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for cycle in get_cycles(graph):

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    print 'cycle', '->'.join(str(n) for n in cycle)