goa/db.py
author Stephanie Marcu <stephanie.marcu@logilab.fr>
Tue, 19 Jan 2010 10:43:48 +0100
changeset 4259 83b0bf9b0a51
parent 4252 6c4f109c2b03
child 4267 3ea88c8e7d7f
permissions -rw-r--r--
inherit from FieldWidget to inherit from the process_field_data required by the edit controller
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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: 2008-2010 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 Binary, entities
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from cubicweb.req import RequestSessionBase
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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], RequestSessionBase):
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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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   132
    if MODE == 'test':
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   133
        TEST_MODELS[entitycls] = dbclassdict
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        dbclassdict = deepcopy(dbclassdict)
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   135
        for propname, prop in TEST_MODELS[entitycls].iteritems():
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   136
            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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   138
    return dbclassdict
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   139
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   140
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   141
class Model(entities.AnyEntity):
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    id = 'Any'
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    __metaclass__ = gaedbmetaentity
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   144
0
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    row = col = 0
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0
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    @classmethod
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    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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   156
        #
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        # Entity prototype:
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        #   __init__(self, req, rset, row=None, col=0)
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   159
        if args and isinstance(args[0], RequestSessionBase) or 'req' in kwargs:
0
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   160
            super(Model, self).__init__(*args, **kwargs)
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   161
            self._gaeinitargs = None
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   162
        else:
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   163
            super(Model, self).__init__(None, None)
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   164
            # if Model instances are given in kwargs, turn them into db model
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   165
            for key, val in kwargs.iteritems():
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   166
                if key in self.e_schema.subject_relations() and not self.e_schema.schema[key].final:
0
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   167
                    if isinstance(kwargs, (list, tuple)):
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   168
                        val = [isinstance(x, Model) and x._dbmodel or x for x in val]
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   169
                    elif isinstance(val, Model):
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                        val = val._dbmodel
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   171
                    kwargs[key] = val.key()
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            self._gaeinitargs = (args, kwargs)
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   173
0
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   174
    def __repr__(self):
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   175
        return '<ModelEntity %s %s %s at %s>' % (
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   176
            self.e_schema, self.eid, self.keys(), id(self))
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   177
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   178
    def _cubicweb_to_datastore(self, attr, value):
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   179
        attr = attr[2:] # remove 's_' / 'o_' prefix
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   180
        if attr in self._attributes:
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   181
            tschema = self.e_schema.destination(attr)
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   182
            if tschema == 'String':
0
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   183
                if len(value) > 500:
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   184
                    value = Text(value)
0
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   185
            elif tschema == 'Password':
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   186
                # if value is a Binary instance, this mean we got it
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   187
                # from a query result and so it is already encrypted
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   188
                if isinstance(value, Binary):
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   189
                    value = value.getvalue()
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   190
                else:
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   191
                    value = crypt_password(value)
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   192
            elif tschema == 'Bytes':
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   193
                if isinstance(value, Binary):
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   194
                    value = value.getvalue()
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   195
                value = Blob(value)
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   196
        else:
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   197
            value = Key(value)
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   198
        return value
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   199
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   200
    def _to_gae_dict(self, convert=True):
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   201
        gaedict = {}
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diff changeset
   202
        for attr, value in self.iteritems():
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diff changeset
   203
            attr = 's_' + attr
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diff changeset
   204
            if value is not None and convert:
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diff changeset
   205
                value = self._cubicweb_to_datastore(attr, value)
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diff changeset
   206
            gaedict[attr] = value
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diff changeset
   207
        return gaedict
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diff changeset
   208
0
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   209
    def to_gae_model(self):
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   210
        dbmodel = self._dbmodel
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diff changeset
   211
        dbmodel.update(self._to_gae_dict())
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diff changeset
   212
        return dbmodel
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diff changeset
   213
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   214
    @property
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diff changeset
   215
    @cached
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diff changeset
   216
    def _dbmodel(self):
0
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   217
        if self.has_eid():
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diff changeset
   218
            assert self._gaeinitargs is None
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diff changeset
   219
            try:
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diff changeset
   220
                return self.req.datastore_get(self.eid)
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diff changeset
   221
            except AttributeError: # self.req is not a server session
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diff changeset
   222
                return Get(self.eid)
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   223
        self.set_defaults()
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diff changeset
   224
        values = self._to_gae_dict(convert=False)
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diff changeset
   225
        parent = key_name = _app = None
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diff changeset
   226
        if self._gaeinitargs is not None:
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diff changeset
   227
            args, kwargs = self._gaeinitargs
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   228
            args = list(args)
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diff changeset
   229
            if args:
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diff changeset
   230
                parent = args.pop(0)
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diff changeset
   231
            if args:
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diff changeset
   232
                key_name = args.pop(0)
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diff changeset
   233
            if args:
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diff changeset
   234
                _app = args.pop(0)
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diff changeset
   235
            assert not args
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diff changeset
   236
            if 'parent' in kwargs:
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diff changeset
   237
                assert parent is None
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diff changeset
   238
                parent = kwargs.pop('parent')
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diff changeset
   239
            if 'key_name' in kwargs:
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   240
                assert key_name is None
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diff changeset
   241
                key_name = kwargs.pop('key_name')
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diff changeset
   242
            if '_app' in kwargs:
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diff changeset
   243
                assert _app is None
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diff changeset
   244
                _app = kwargs.pop('_app')
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diff changeset
   245
0
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diff changeset
   246
            for key, value in kwargs.iteritems():
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diff changeset
   247
                if key in self._attributes:
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diff changeset
   248
                    values['s_'+key] = value
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diff changeset
   249
        else:
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diff changeset
   250
            kwargs = None
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diff changeset
   251
        if key_name is None:
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diff changeset
   252
            key_name = self.db_key_name()
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diff changeset
   253
            if key_name is not None:
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diff changeset
   254
                key_name = 'key_' + key_name
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diff changeset
   255
        for key, value in values.iteritems():
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diff changeset
   256
            if value is None:
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diff changeset
   257
                continue
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diff changeset
   258
            values[key] = self._cubicweb_to_datastore(key, value)
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   259
        entity = Entity(self.id, parent, _app, key_name)
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   260
        entity.update(values)
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   261
        init_relations(entity, self.e_schema)
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parents:
diff changeset
   262
        return entity
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parents:
diff changeset
   263
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   264
    def db_key_name(self):
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parents:
diff changeset
   265
        """override this method to control datastore key name that should be
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parents:
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   266
        used at entity creation.
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parents:
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   267
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   268
        Note that if this function return something else than None, the returned
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parents:
diff changeset
   269
        value will be prefixed by 'key_' to build the actual key name.
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parents:
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   270
        """
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   271
        return None
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0
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   273
    def metainformation(self):
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   274
        return {'type': self.id, 'source': {'uri': 'system'}, 'extid': None}
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0
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   276
    def view(self, vid, __registry='views', **kwargs):
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   277
        """shortcut to apply a view on this entity"""
2650
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
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   278
        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
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   279
                                           row=self.row, col=self.col, **kwargs)
0
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   280
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   281
    @classmethod
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diff changeset
   282
    def _rest_attr_info(cls):
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parents:
diff changeset
   283
        mainattr, needcheck = super(Model, cls)._rest_attr_info()
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diff changeset
   284
        if needcheck:
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diff changeset
   285
            return 'eid', False
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diff changeset
   286
        return mainattr, needcheck
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   287
0
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   288
    def get_value(self, name):
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diff changeset
   289
        try:
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parents:
diff changeset
   290
            value = self[name]
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parents:
diff changeset
   291
        except KeyError:
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parents:
diff changeset
   292
            if not self.has_eid():
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parents:
diff changeset
   293
                return None
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parents:
diff changeset
   294
            value = self._dbmodel.get('s_'+name)
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parents:
diff changeset
   295
            if value is not None:
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parents:
diff changeset
   296
                if isinstance(value, Text):
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parents:
diff changeset
   297
                    value = unicode(value)
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parents:
diff changeset
   298
                elif isinstance(value, Blob):
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parents:
diff changeset
   299
                    value = Binary(str(value))
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parents:
diff changeset
   300
            self[name] = value
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parents:
diff changeset
   301
        return value
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parents:
diff changeset
   302
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   303
    def has_eid(self):
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parents:
diff changeset
   304
        if self.eid is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   305
            return False
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parents:
diff changeset
   306
        try:
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parents:
diff changeset
   307
            Key(self.eid)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   308
            return True
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   309
        except BadKeyError:
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parents:
diff changeset
   310
            return False
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parents: 1131
diff changeset
   311
0
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parents:
diff changeset
   312
    def complete(self, skip_bytes=True):
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parents:
diff changeset
   313
        pass
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parents:
diff changeset
   314
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parents:
diff changeset
   315
    def unrelated(self, rtype, targettype, role='subject', limit=None,
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   316
                  ordermethod=None):
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parents:
diff changeset
   317
        # XXX dumb implementation
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parents:
diff changeset
   318
        if limit is not None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   319
            objs = Query(str(targettype)).Get(limit)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   320
        else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   321
            objs = Query(str(targettype)).Run()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   322
        return rset_from_objs(self.req, objs, ('eid',),
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   323
                              'Any X WHERE X is %s' % targettype)
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d628defebc17 delete-trailing-whitespace + some copyright update
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parents: 1131
diff changeset
   324
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   325
    def key(self):
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parents:
diff changeset
   326
        return Key(self.eid)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   327
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parents:
diff changeset
   328
    def put(self, req=None):
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parents:
diff changeset
   329
        if req is not None and self.req is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   330
            self.req = req
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   331
        dbmodel = self.to_gae_model()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   332
        key = Put(dbmodel)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   333
        self.set_eid(str(key))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   334
        if self.req is not None and self.rset is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   335
            self.rset = rset_from_objs(self.req, dbmodel, ('eid',),
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   336
                                       'Any X WHERE X eid %(x)s', {'x': self.eid})
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   337
            self.row = self.col = 0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   338
        return dbmodel
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parents: 1131
diff changeset
   339
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   340
    @needrequest
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   341
    def get(cls, req, keys):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   342
        # if check if this is a dict.key call
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   343
        if isinstance(cls, Model) and keys in cls._attributes:
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parents:
diff changeset
   344
            return super(Model, cls).get(keys)
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parents:
diff changeset
   345
        rset = rset_from_objs(req, Get(keys), ('eid',),
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   346
                              'Any X WHERE X eid IN %(x)s', {'x': keys})
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   347
        return list(rset.entities())
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   348
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   349
    @needrequest
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   350
    def get_by_id(cls, req, ids, parent=None):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   351
        if isinstance(parent, Model):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   352
            parent = parent.key()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   353
        ids, multiple = NormalizeAndTypeCheck(ids, (int, long))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   354
        keys = [Key.from_path(cls.kind(), id, parent=parent)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   355
                for id in ids]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   356
        rset = rset_from_objs(req, Get(keys))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   357
        return list(rset.entities())
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parents:
diff changeset
   358
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   359
    @classmethod
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   360
    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
   361
        if isinstance(parent, Model):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   362
            parent = parent.key()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   363
        key_names, multiple = NormalizeAndTypeCheck(key_names, basestring)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   364
        keys = [Key.from_path(cls.kind(), name, parent=parent)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   365
                for name in key_names]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   366
        rset = rset_from_objs(req, Get(keys))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   367
        return list(rset.entities())
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   368
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   369
    @classmethod
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   370
    def get_or_insert(cls, req, key_name, **kwds):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   371
        def txn():
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   372
            entity = cls.get_by_key_name(key_name, parent=kwds.get('parent'))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   373
            if entity is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   374
                entity = cls(key_name=key_name, **kwds)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   375
                entity.put()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
            return entity
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   377
        return RunInTransaction(txn)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   378
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   379
    @classmethod
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   380
    def all(cls, req):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
        rset = rset_from_objs(req, Query(cls.id).Run())
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
        return list(rset.entities())
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
    @classmethod
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
    def gql(cls, req, query_string, *args, **kwds):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
        raise NotImplementedError('use rql')
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
    @classmethod
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
    def kind(cls):
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0e52d72104a6 pylint fixes
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   390
        return cls.id
0
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   391
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   392
    @classmethod
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   393
    def properties(cls):
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   394
        raise NotImplementedError('use eschema')
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   395
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   396
    def dynamic_properties(self):
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   397
        raise NotImplementedError('use eschema')
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d628defebc17 delete-trailing-whitespace + some copyright update
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   398
0
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   399
    def is_saved(self):
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   400
        return self.has_eid()
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   401
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   402
    def parent(self):
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   403
        parent = self._dbmodel.parent()
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   404
        if not parent is None:
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   405
            rset = rset_from_objs(self.req, (parent,), ('eid',),
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   406
                                  'Any X WHERE X eid %(x)s', {'x': parent.key()})
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   407
            parent = rset.get_entity(0, 0)
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   408
        return parent
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   409
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   410
    def parent_key(self):
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   411
        return self.parent().key()
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   412
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   413
    def to_xml(self):
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   414
        return self._dbmodel.ToXml()
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   415
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   416
# hijack AnyEntity class
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   417
entities.AnyEntity = Model
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   418
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   419
BooleanProperty = db.BooleanProperty
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   420
URLProperty = db.URLProperty
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   421
DateProperty = db.DateProperty
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   422
DateTimeProperty = db.DateTimeProperty
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   423
TimeProperty = db.TimeProperty
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   424
StringProperty = db.StringProperty
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   425
TextProperty = db.TextProperty
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   426
BlobProperty = db.BlobProperty
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   427
IntegerProperty = db.IntegerProperty
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   428
FloatProperty = db.FloatProperty
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   429
ListProperty = db.ListProperty
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d628defebc17 delete-trailing-whitespace + some copyright update
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parents: 1131
diff changeset
   430
SelfReferenceProperty = db.SelfReferenceProperty
0
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parents:
diff changeset
   431
UserProperty = db.UserProperty
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parents:
diff changeset
   432
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parents:
diff changeset
   433
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   434
class ReferencePropertyStub(object):
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diff changeset
   435
    def __init__(self, cls, args, kwargs):
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diff changeset
   436
        self.cls = cls
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diff changeset
   437
        self.args = args
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diff changeset
   438
        self.kwargs = kwargs
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parents:
diff changeset
   439
        self.required = False
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   440
        self.__dict__.update(kwargs)
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diff changeset
   441
        self.creation_counter = db.Property.creation_counter
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parents:
diff changeset
   442
        db.Property.creation_counter += 1
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parents:
diff changeset
   443
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diff changeset
   444
    @property
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   445
    def data_type(self):
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diff changeset
   446
        class FakeDataType(object):
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diff changeset
   447
            @staticmethod
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diff changeset
   448
            def kind():
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parents:
diff changeset
   449
                return self.cls.__name__
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parents:
diff changeset
   450
        return FakeDataType
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parents:
diff changeset
   451
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   452
def ReferenceProperty(cls, *args, **kwargs):
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diff changeset
   453
    if issubclass(cls, db.Model):
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diff changeset
   454
        cls = db.class_for_kind(cls.__name__)
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parents:
diff changeset
   455
        return db.ReferenceProperty(cls, *args, **kwargs)
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parents:
diff changeset
   456
    return ReferencePropertyStub(cls, args, kwargs)