goa/db.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Mon, 23 Nov 2009 19:33:56 +0100
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"""provide replacement classes for gae db module, so that a gae model can be
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used as base for a cubicweb application by simply replacing ::
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  from google.appengine.ext import db
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by
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  from cubicweb.goa import db
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The db.model api should be fully featured by replacement classes, with the
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following differences:
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* all methods returning `google.appengine.ext.db.Model` instance(s) will return
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  `cubicweb.goa.db.Model` instance instead (though you should see almost no
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  difference since those instances have the same api)
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* class methods returning model instance take a `req` as first argument, unless
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  they are called through an instance, representing the current request
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  (accessible through `self.req` on almost all objects)
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* XXX no instance.<modelname>_set attributes, use instance.reverse_<attr name>
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      instead
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* XXX reference property always return a list of objects, not the instance
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* XXX name/collection_name argument of properties constructor are ignored
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* XXX ListProperty
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:organization: Logilab
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:copyright: 2008-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from copy import deepcopy
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from logilab.common.decorators import cached, iclassmethod
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from cubicweb import RequestSessionMixIn, Binary, entities
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from cubicweb.rset import ResultSet
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from cubicweb.entity import metaentity
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from cubicweb.server.utils import crypt_password
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from cubicweb.goa import MODE
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from cubicweb.goa.dbinit import init_relations
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from google.appengine.api.datastore import Get, Put, Key, Entity, Query
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from google.appengine.api.datastore import NormalizeAndTypeCheck, RunInTransaction
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from google.appengine.api.datastore_types import Text, Blob
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from google.appengine.api.datastore_errors import BadKeyError
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# XXX remove this dependancy
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from google.appengine.ext import db
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def rset_from_objs(req, objs, attrs=('eid',), rql=None, args=None):
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    """return a ResultSet instance for list of objects"""
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    if objs is None:
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        objs = ()
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    elif isinstance(objs, Entity):
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        objs = (objs,)
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    if rql is None:
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        rql = 'Any X'
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    rows = []
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    description = []
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    rset = ResultSet(rows, rql, args, description=description)
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    vreg = req.vreg
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    for i, obj in enumerate(objs):
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        line = []
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        linedescr = []
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        eschema = vreg.schema.eschema(obj.kind())
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        for j, attr in enumerate(attrs):
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            if attr == 'eid':
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                value = obj.key()
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                obj.row, obj.col = i, j
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                descr = eschema.type
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                value = str(value)
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            else:
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                value = obj[attr]
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                descr = str(eschema.destination(attr))
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            line.append(value)
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            linedescr.append(descr)
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        rows.append(line)
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        description.append(linedescr)
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        for j, attr in enumerate(attrs):
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            if attr == 'eid':
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                entity = vreg.etype_class(eschema.type)(req, rset, i, j)
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                rset._get_entity_cache_ = {(i, j): entity}
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    rset.rowcount = len(rows)
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    req.decorate_rset(rset)
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    return rset
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def needrequest(wrapped):
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    def wrapper(cls, *args, **kwargs):
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        req = kwargs.pop('req', None)
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        if req is None and args and isinstance(args[0], RequestSessionMixIn):
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            args = list(args)
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            req = args.pop(0)
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        if req is None:
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            req = getattr(cls, 'req', None)
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            if req is None:
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                raise Exception('either call this method on an instance or '
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                                'specify the req argument')
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        return wrapped(cls, req, *args, **kwargs)
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    return iclassmethod(wrapper)
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class gaedbmetaentity(metaentity):
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    """metaclass for goa.db.Model classes: filter entity / db model part,
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    put aside the db model part for later creation of db model class.
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    """
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    def __new__(mcs, name, bases, classdict):
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        if not 'id' in classdict:
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            classdict['id'] = name
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        entitycls = super(gaedbmetaentity, mcs).__new__(mcs, name, bases, classdict)
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        return entitycls
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TEST_MODELS = {}
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def extract_dbmodel(entitycls):
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    if MODE == 'test' and entitycls in TEST_MODELS:
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        dbclassdict = TEST_MODELS[entitycls]
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    else:
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        dbclassdict = {}
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        for attr, value in entitycls.__dict__.items():
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            if isinstance(value, db.Property) or isinstance(value, ReferencePropertyStub):
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                dbclassdict[attr] = value
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                # don't remove attr from entitycls, this make tests fail, and it's anyway
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                # overwritten by descriptor at class initialization time
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                #delattr(entitycls, attr)
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   131
    if MODE == 'test':
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        TEST_MODELS[entitycls] = dbclassdict
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        dbclassdict = deepcopy(dbclassdict)
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        for propname, prop in TEST_MODELS[entitycls].iteritems():
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   135
            if getattr(prop, 'reference_class', None) is db._SELF_REFERENCE:
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                dbclassdict[propname].reference_class = db._SELF_REFERENCE
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   137
    return dbclassdict
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   138
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   139
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class Model(entities.AnyEntity):
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   141
    id = 'Any'
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    __metaclass__ = gaedbmetaentity
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   143
0
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   144
    row = col = 0
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0
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   146
    @classmethod
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   147
    def __initialize__(cls):
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        super(Model, cls).__initialize__()
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        cls._attributes = frozenset(rschema for rschema in cls.e_schema.subject_relations()
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                                    if rschema.final)
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0
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    def __init__(self, *args, **kwargs):
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        # db.Model prototype:
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        #   __init__(self, parent=None, key_name=None, **kw)
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   155
        #
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   156
        # Entity prototype:
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        #   __init__(self, req, rset, row=None, col=0)
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   158
        if args and isinstance(args[0], RequestSessionMixIn) or 'req' in kwargs:
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   159
            super(Model, self).__init__(*args, **kwargs)
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   160
            self._gaeinitargs = None
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   161
        else:
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   162
            super(Model, self).__init__(None, None)
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   163
            # if Model instances are given in kwargs, turn them into db model
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   164
            for key, val in kwargs.iteritems():
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   165
                if key in self.e_schema.subject_relations() and not self.e_schema.schema[key].final:
0
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   166
                    if isinstance(kwargs, (list, tuple)):
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   167
                        val = [isinstance(x, Model) and x._dbmodel or x for x in val]
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   168
                    elif isinstance(val, Model):
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   169
                        val = val._dbmodel
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   170
                    kwargs[key] = val.key()
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   171
            self._gaeinitargs = (args, kwargs)
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   172
0
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   173
    def __repr__(self):
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   174
        return '<ModelEntity %s %s %s at %s>' % (
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   175
            self.e_schema, self.eid, self.keys(), id(self))
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   176
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   177
    def _cubicweb_to_datastore(self, attr, value):
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   178
        attr = attr[2:] # remove 's_' / 'o_' prefix
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   179
        if attr in self._attributes:
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   180
            tschema = self.e_schema.destination(attr)
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diff changeset
   181
            if tschema == 'String':
0
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   182
                if len(value) > 500:
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   183
                    value = Text(value)
0
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   184
            elif tschema == 'Password':
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   185
                # if value is a Binary instance, this mean we got it
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   186
                # from a query result and so it is already encrypted
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   187
                if isinstance(value, Binary):
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   188
                    value = value.getvalue()
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diff changeset
   189
                else:
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   190
                    value = crypt_password(value)
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   191
            elif tschema == 'Bytes':
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diff changeset
   192
                if isinstance(value, Binary):
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   193
                    value = value.getvalue()
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   194
                value = Blob(value)
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   195
        else:
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   196
            value = Key(value)
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   197
        return value
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diff changeset
   198
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diff changeset
   199
    def _to_gae_dict(self, convert=True):
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   200
        gaedict = {}
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diff changeset
   201
        for attr, value in self.iteritems():
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diff changeset
   202
            attr = 's_' + attr
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diff changeset
   203
            if value is not None and convert:
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diff changeset
   204
                value = self._cubicweb_to_datastore(attr, value)
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diff changeset
   205
            gaedict[attr] = value
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diff changeset
   206
        return gaedict
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diff changeset
   207
0
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diff changeset
   208
    def to_gae_model(self):
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diff changeset
   209
        dbmodel = self._dbmodel
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diff changeset
   210
        dbmodel.update(self._to_gae_dict())
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diff changeset
   211
        return dbmodel
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diff changeset
   212
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diff changeset
   213
    @property
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   214
    @cached
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diff changeset
   215
    def _dbmodel(self):
0
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diff changeset
   216
        if self.has_eid():
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diff changeset
   217
            assert self._gaeinitargs is None
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diff changeset
   218
            try:
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diff changeset
   219
                return self.req.datastore_get(self.eid)
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diff changeset
   220
            except AttributeError: # self.req is not a server session
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diff changeset
   221
                return Get(self.eid)
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diff changeset
   222
        self.set_defaults()
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diff changeset
   223
        values = self._to_gae_dict(convert=False)
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diff changeset
   224
        parent = key_name = _app = None
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diff changeset
   225
        if self._gaeinitargs is not None:
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diff changeset
   226
            args, kwargs = self._gaeinitargs
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diff changeset
   227
            args = list(args)
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diff changeset
   228
            if args:
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diff changeset
   229
                parent = args.pop(0)
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diff changeset
   230
            if args:
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diff changeset
   231
                key_name = args.pop(0)
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diff changeset
   232
            if args:
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diff changeset
   233
                _app = args.pop(0)
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diff changeset
   234
            assert not args
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diff changeset
   235
            if 'parent' in kwargs:
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diff changeset
   236
                assert parent is None
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diff changeset
   237
                parent = kwargs.pop('parent')
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diff changeset
   238
            if 'key_name' in kwargs:
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diff changeset
   239
                assert key_name is None
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diff changeset
   240
                key_name = kwargs.pop('key_name')
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diff changeset
   241
            if '_app' in kwargs:
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diff changeset
   242
                assert _app is None
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diff changeset
   243
                _app = kwargs.pop('_app')
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diff changeset
   244
0
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diff changeset
   245
            for key, value in kwargs.iteritems():
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diff changeset
   246
                if key in self._attributes:
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diff changeset
   247
                    values['s_'+key] = value
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diff changeset
   248
        else:
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diff changeset
   249
            kwargs = None
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diff changeset
   250
        if key_name is None:
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diff changeset
   251
            key_name = self.db_key_name()
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diff changeset
   252
            if key_name is not None:
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diff changeset
   253
                key_name = 'key_' + key_name
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diff changeset
   254
        for key, value in values.iteritems():
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diff changeset
   255
            if value is None:
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parents:
diff changeset
   256
                continue
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diff changeset
   257
            values[key] = self._cubicweb_to_datastore(key, value)
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diff changeset
   258
        entity = Entity(self.id, parent, _app, key_name)
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parents:
diff changeset
   259
        entity.update(values)
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parents:
diff changeset
   260
        init_relations(entity, self.e_schema)
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        return entity
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    def db_key_name(self):
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   264
        """override this method to control datastore key name that should be
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   265
        used at entity creation.
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   267
        Note that if this function return something else than None, the returned
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   268
        value will be prefixed by 'key_' to build the actual key name.
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   269
        """
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   270
        return None
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0
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   272
    def metainformation(self):
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   273
        return {'type': self.id, 'source': {'uri': 'system'}, 'extid': None}
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0
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   275
    def view(self, vid, __registry='views', **kwargs):
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        """shortcut to apply a view on this entity"""
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   277
        return self.vreg[__registry]render(vid, self.req, rset=self.rset,
18aec79ec3a3 R [vreg] important refactoring of the vregistry, moving behaviour to end dictionnary (and so leaving room for more flexibility ; keep bw compat ; update api usage in cw
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                                           row=self.row, col=self.col, **kwargs)
0
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   280
    @classmethod
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   281
    def _rest_attr_info(cls):
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   282
        mainattr, needcheck = super(Model, cls)._rest_attr_info()
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   283
        if needcheck:
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   284
            return 'eid', False
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   285
        return mainattr, needcheck
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0
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   287
    def get_value(self, name):
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   288
        try:
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   289
            value = self[name]
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   290
        except KeyError:
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   291
            if not self.has_eid():
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   292
                return None
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   293
            value = self._dbmodel.get('s_'+name)
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   294
            if value is not None:
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   295
                if isinstance(value, Text):
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   296
                    value = unicode(value)
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   297
                elif isinstance(value, Blob):
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   298
                    value = Binary(str(value))
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   299
            self[name] = value
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   300
        return value
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   301
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   302
    def has_eid(self):
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   303
        if self.eid is None:
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diff changeset
   304
            return False
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parents:
diff changeset
   305
        try:
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   306
            Key(self.eid)
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diff changeset
   307
            return True
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parents:
diff changeset
   308
        except BadKeyError:
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diff changeset
   309
            return False
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   310
0
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   311
    def complete(self, skip_bytes=True):
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   312
        pass
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   313
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   314
    def unrelated(self, rtype, targettype, role='subject', limit=None,
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parents:
diff changeset
   315
                  ordermethod=None):
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diff changeset
   316
        # XXX dumb implementation
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diff changeset
   317
        if limit is not None:
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diff changeset
   318
            objs = Query(str(targettype)).Get(limit)
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parents:
diff changeset
   319
        else:
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parents:
diff changeset
   320
            objs = Query(str(targettype)).Run()
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parents:
diff changeset
   321
        return rset_from_objs(self.req, objs, ('eid',),
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parents:
diff changeset
   322
                              'Any X WHERE X is %s' % targettype)
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parents: 1131
diff changeset
   323
0
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parents:
diff changeset
   324
    def key(self):
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parents:
diff changeset
   325
        return Key(self.eid)
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parents:
diff changeset
   326
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diff changeset
   327
    def put(self, req=None):
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parents:
diff changeset
   328
        if req is not None and self.req is None:
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parents:
diff changeset
   329
            self.req = req
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parents:
diff changeset
   330
        dbmodel = self.to_gae_model()
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parents:
diff changeset
   331
        key = Put(dbmodel)
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parents:
diff changeset
   332
        self.set_eid(str(key))
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parents:
diff changeset
   333
        if self.req is not None and self.rset is None:
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parents:
diff changeset
   334
            self.rset = rset_from_objs(self.req, dbmodel, ('eid',),
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parents:
diff changeset
   335
                                       'Any X WHERE X eid %(x)s', {'x': self.eid})
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parents:
diff changeset
   336
            self.row = self.col = 0
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parents:
diff changeset
   337
        return dbmodel
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diff changeset
   338
0
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parents:
diff changeset
   339
    @needrequest
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parents:
diff changeset
   340
    def get(cls, req, keys):
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parents:
diff changeset
   341
        # if check if this is a dict.key call
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parents:
diff changeset
   342
        if isinstance(cls, Model) and keys in cls._attributes:
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diff changeset
   343
            return super(Model, cls).get(keys)
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diff changeset
   344
        rset = rset_from_objs(req, Get(keys), ('eid',),
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parents:
diff changeset
   345
                              'Any X WHERE X eid IN %(x)s', {'x': keys})
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parents:
diff changeset
   346
        return list(rset.entities())
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parents:
diff changeset
   347
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parents:
diff changeset
   348
    @needrequest
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parents:
diff changeset
   349
    def get_by_id(cls, req, ids, parent=None):
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parents:
diff changeset
   350
        if isinstance(parent, Model):
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parents:
diff changeset
   351
            parent = parent.key()
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diff changeset
   352
        ids, multiple = NormalizeAndTypeCheck(ids, (int, long))
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parents:
diff changeset
   353
        keys = [Key.from_path(cls.kind(), id, parent=parent)
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parents:
diff changeset
   354
                for id in ids]
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parents:
diff changeset
   355
        rset = rset_from_objs(req, Get(keys))
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parents:
diff changeset
   356
        return list(rset.entities())
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parents:
diff changeset
   357
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parents:
diff changeset
   358
    @classmethod
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parents:
diff changeset
   359
    def get_by_key_name(cls, req, key_names, parent=None):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   360
        if isinstance(parent, Model):
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parents:
diff changeset
   361
            parent = parent.key()
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parents:
diff changeset
   362
        key_names, multiple = NormalizeAndTypeCheck(key_names, basestring)
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parents:
diff changeset
   363
        keys = [Key.from_path(cls.kind(), name, parent=parent)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   364
                for name in key_names]
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parents:
diff changeset
   365
        rset = rset_from_objs(req, Get(keys))
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parents:
diff changeset
   366
        return list(rset.entities())
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parents:
diff changeset
   367
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parents:
diff changeset
   368
    @classmethod
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parents:
diff changeset
   369
    def get_or_insert(cls, req, key_name, **kwds):
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parents:
diff changeset
   370
        def txn():
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parents:
diff changeset
   371
            entity = cls.get_by_key_name(key_name, parent=kwds.get('parent'))
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parents:
diff changeset
   372
            if entity is None:
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parents:
diff changeset
   373
                entity = cls(key_name=key_name, **kwds)
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parents:
diff changeset
   374
                entity.put()
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parents:
diff changeset
   375
            return entity
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
        return RunInTransaction(txn)
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parents:
diff changeset
   377
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parents:
diff changeset
   378
    @classmethod
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parents:
diff changeset
   379
    def all(cls, req):
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parents:
diff changeset
   380
        rset = rset_from_objs(req, Query(cls.id).Run())
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parents:
diff changeset
   381
        return list(rset.entities())
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parents:
diff changeset
   382
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
    @classmethod
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
    def gql(cls, req, query_string, *args, **kwds):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
        raise NotImplementedError('use rql')
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
    @classmethod
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
    def kind(cls):
447
0e52d72104a6 pylint fixes
sylvain.thenault@logilab.fr
parents: 0
diff changeset
   389
        return cls.id
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
    @classmethod
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   392
    def properties(cls):
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parents:
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   393
        raise NotImplementedError('use eschema')
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parents:
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   394
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   395
    def dynamic_properties(self):
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   396
        raise NotImplementedError('use eschema')
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d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1131
diff changeset
   397
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
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   398
    def is_saved(self):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
        return self.has_eid()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
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   401
    def parent(self):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
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   402
        parent = self._dbmodel.parent()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
        if not parent is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
            rset = rset_from_objs(self.req, (parent,), ('eid',),
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
                                  'Any X WHERE X eid %(x)s', {'x': parent.key()})
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
            parent = rset.get_entity(0, 0)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
        return parent
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
    def parent_key(self):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
        return self.parent().key()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
    def to_xml(self):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
        return self._dbmodel.ToXml()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
# hijack AnyEntity class
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
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   416
entities.AnyEntity = Model
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
BooleanProperty = db.BooleanProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
URLProperty = db.URLProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
DateProperty = db.DateProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
DateTimeProperty = db.DateTimeProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   422
TimeProperty = db.TimeProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   423
StringProperty = db.StringProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
TextProperty = db.TextProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   425
BlobProperty = db.BlobProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
IntegerProperty = db.IntegerProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
FloatProperty = db.FloatProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
ListProperty = db.ListProperty
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d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1131
diff changeset
   429
SelfReferenceProperty = db.SelfReferenceProperty
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
UserProperty = db.UserProperty
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   432
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
class ReferencePropertyStub(object):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
    def __init__(self, cls, args, kwargs):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   435
        self.cls = cls
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   436
        self.args = args
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   437
        self.kwargs = kwargs
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   438
        self.required = False
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
        self.__dict__.update(kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
        self.creation_counter = db.Property.creation_counter
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
        db.Property.creation_counter += 1
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
    @property
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
    def data_type(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
        class FakeDataType(object):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
            @staticmethod
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
            def kind():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
                return self.cls.__name__
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
        return FakeDataType
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
def ReferenceProperty(cls, *args, **kwargs):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
    if issubclass(cls, db.Model):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   453
        cls = db.class_for_kind(cls.__name__)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   454
        return db.ReferenceProperty(cls, *args, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   455
    return ReferencePropertyStub(cls, args, kwargs)