web/views/cwsources.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 07 Feb 2011 18:19:36 +0100
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child 6962 220e32f058be
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[sources] rewrite the way pyrorql mapping are stored in the database so it can be reused for other sources (eg datafeed+cwxml)
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# copyright 2010-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Specific views for data sources and related entities (eg CWSource,
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CWSourceHostConfig, CWSourceSchemaConfig).
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from itertools import repeat, chain
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from cubicweb.selectors import is_instance, score_entity, match_user_groups
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from cubicweb.view import EntityView
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from cubicweb.schema import META_RTYPES, VIRTUAL_RTYPES, display_name
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from cubicweb.web import uicfg
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from cubicweb.web.views import tabs
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_pvs = uicfg.primaryview_section
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_pvs.tag_object_of(('*', 'cw_for_source', 'CWSource'), 'hidden')
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class CWSourcePrimaryView(tabs.TabbedPrimaryView):
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    __select__ = is_instance('CWSource')
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    tabs = [_('cwsource-main'), _('cwsource-mapping')]
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    default_tab = 'cwsource-main'
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class CWSourceMainTab(tabs.PrimaryTab):
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    __regid__ = 'cwsource-main'
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    __select__ = tabs.PrimaryTab.__select__ & is_instance('CWSource')
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MAPPED_SOURCE_TYPES = set( ('pyrorql', 'datafeed') )
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class CWSourceMappingTab(EntityView):
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    __regid__ = 'cwsource-mapping'
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    __select__ = (tabs.PrimaryTab.__select__ & is_instance('CWSource')
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                  & match_user_groups('managers')
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                  & score_entity(lambda x:x.type in MAPPED_SOURCE_TYPES))
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    def entity_call(self, entity):
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        _ = self._cw._
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        self.w('<h3>%s</h3>' % _('Entity and relation supported by this source'))
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        rset = self._cw.execute(
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            'Any X, SCH, XO ORDERBY ET WHERE X options XO, X cw_for_source S, S eid %(s)s, '
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            'X cw_schema SCH, SCH is ET', {'s': entity.eid})
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        self.wview('table', rset, 'noresult')
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        # self.w('<h3>%s</h3>' % _('Relations that should not be crossed'))
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        # self.w('<p>%s</p>' % _(
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        #     'By default, when a relation is not supported by a source, it is '
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        #     'supposed that a local relation may point to an entity from the '
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        #     'external source. Relations listed here won\'t have this '
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        #     '"crossing" behaviour.'))
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        # self.wview('list', entity.related('cw_dont_cross'), 'noresult')
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        # self.w('<h3>%s</h3>' % _('Relations that can be crossed'))
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        # self.w('<p>%s</p>' % _(
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        #     'By default, when a relation is supported by a source, it is '
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        #     'supposed that a local relation can\'t point to an entity from the '
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        #     'external source. Relations listed here may have this '
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        #     '"crossing" behaviour anyway.'))
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        # self.wview('list', entity.related('cw_may_cross'), 'noresult')
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        checker = MAPPING_CHECKERS.get(entity.type, MappingChecker)(entity)
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        checker.check()
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        if (checker.errors or checker.warnings or checker.infos):
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                self.w('<h2>%s</h2>' % _('Detected problems'))
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                errors = zip(repeat(_('error')), checker.errors)
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                warnings = zip(repeat(_('warning')), checker.warnings)
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                infos = zip(repeat(_('warning')), checker.infos)
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                self.wview('pyvaltable', pyvalue=chain(errors, warnings, infos))
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class MappingChecker(object):
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    def __init__(self, cwsource):
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        self.cwsource = cwsource
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        self.errors = []
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        self.warnings = []
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        self.infos = []
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        self.schema = cwsource._cw.vreg.schema
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    def init(self):
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    96
        # supported entity types
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    97
        self.sentities = set()
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    98
        # supported relations
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    99
        self.srelations = {}
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   100
        # avoid duplicated messages
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   101
        self.seen = set()
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        # first get mapping as dict/sets
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   103
        for schemacfg in self.cwsource.reverse_cw_for_source:
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   104
            self.init_schemacfg(schemacfg)
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   105
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   106
    def init_schemacfg(self, schemacfg):
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        cwerschema = schemacfg.schema
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   108
        if cwerschema.__regid__ == 'CWEType':
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   109
            self.sentities.add(cwerschema.name)
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   110
        elif cwerschema.__regid__ == 'CWRType':
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   111
            assert not cwerschema.name in self.srelations
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   112
            self.srelations[cwerschema.name] = None
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   113
        else: # CWAttribute/CWRelation
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   114
            self.srelations.setdefault(cwerschema.rtype.name, []).append(
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   115
                (cwerschema.stype.name, cwerschema.otype.name) )
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   116
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   117
    def check(self):
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   118
        self.init()
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   119
        error = self.errors.append
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   120
        warning = self.warnings.append
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        info = self.infos.append
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        for etype in self.sentities:
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   123
            eschema = self.schema[etype]
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   124
            for rschema, ttypes, role in eschema.relation_definitions():
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                if rschema in META_RTYPES:
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   126
                    continue
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                ttypes = [ttype for ttype in ttypes if ttype in self.sentities]
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                if not rschema in self.srelations:
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                    for ttype in ttypes:
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                        rdef = rschema.role_rdef(etype, ttype, role)
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                        self.seen.add(rdef)
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                        if rdef.role_cardinality(role) in '1+':
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                            error(_('relation %(type)s with %(etype)s as %(role)s '
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                                    'and target type %(target)s is mandatory but '
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                                    'not supported') %
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                                  {'rtype': rschema, 'etype': etype, 'role': role,
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                                   'target': ttype})
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                        elif ttype in self.sentities:
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                            warning(_('%s could be supported') % rdef)
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   140
                elif not ttypes:
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                    warning(_('relation %(rtype)s with %(etype)s as %(role)s is '
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                              'supported but no target type supported') %
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   143
                            {'rtype': rschema, 'role': role, 'etype': etype})
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   144
        for rtype in self.srelations:
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            rschema = self.schema[rtype]
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            for subj, obj in rschema.rdefs:
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                if subj in self.sentities and obj in self.sentities:
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   148
                    break
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   149
            else:
6944
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                error(_('relation %s is supported but none if its definitions '
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   151
                        'matches supported entities') % rtype)
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   152
        self.custom_check()
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    def custom_check(self):
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        pass
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   156
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   157
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class PyroRQLMappingChecker(MappingChecker):
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   159
    """pyrorql source mapping checker"""
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   160
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    def init(self):
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   162
        self.dontcross = set()
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   163
        self.maycross = set()
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        super(PyroRQLMappingChecker, self).init()
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   165
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    def init_schemacfg(self, schemacfg):
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        options = schemacfg.options or ()
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   168
        if 'dontcross' in options:
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            self.dontcross.add(schemacfg.schema.name)
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   170
        else:
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            super(PyroRQLMappingChecker, self).init_schemacfg(schemacfg)
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   172
            if 'maycross' in options:
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                self.maycross.add(schemacfg.schema.name)
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   174
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   175
    def custom_check(self):
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        error = self.errors.append
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        info = self.infos.append
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        for etype in self.sentities:
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            eschema = self.schema[etype]
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            for rschema, ttypes, role in eschema.relation_definitions():
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                if rschema in META_RTYPES:
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   182
                    continue
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   183
                if not rschema in self.srelations:
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                    if rschema not in self.dontcross:
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                        if role == 'subject' and rschema.inlined:
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                            error(_('inlined relation %(rtype)s of %(etype)s '
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                                    'should be supported') %
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                                  {'rtype': rschema, 'etype': etype})
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                        elif (rschema not in self.seen and rschema not in self.maycross):
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                            info(_('you may want to specify something for %s') %
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                                 rschema)
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                            self.seen.add(rschema)
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                elif rschema in self.maycross and rschema.inlined:
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                    error(_('you should un-inline relation %s which is '
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                            'supported and may be crossed ') % rschema)
6944
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MAPPING_CHECKERS = {
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    'pyrorql': PyroRQLMappingChecker,
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    }