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jsonifiable.py
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# This file is a part of github2fedmsg, a pubsubhubbub to zeromq bridge.
# Copyright (C) 2014, Red Hat, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import datetime
import time
from sqlalchemy.orm import (
class_mapper,
)
from sqlalchemy.orm.properties import RelationshipProperty
class JSONifiable(object):
""" A mixin for sqlalchemy models providing a .__json__ method. """
def __json__(self, seen=None):
""" Returns a dict representation of the object.
Recursively evaluates .__json__() on its relationships.
"""
if not seen:
seen = []
properties = list(class_mapper(type(self)).iterate_properties)
relationships = [
p.key for p in properties if type(p) is RelationshipProperty
]
attrs = [
p.key for p in properties if p.key not in relationships
]
d = dict([(attr, getattr(self, attr)) for attr in attrs])
for attr in relationships:
d[attr] = self._expand(getattr(self, attr), seen)
if hasattr(self, 'avatar'):
d['avatar'] = self.avatar
# Serialize datetime objects
for k, v in d.items():
if isinstance(v, datetime.datetime):
d[k] = time.mktime(v.timetuple())
return d
def _expand(self, relation, seen):
""" Return the __json__() or id of a sqlalchemy relationship. """
if hasattr(relation, 'all'):
relation = relation.all()
if hasattr(relation, '__iter__'):
return [self._expand(item, seen) for item in relation]
if not relation:
return []
if type(relation) not in seen:
return relation.__json__(seen + [type(self)])
else:
return self._primary(relation)
def _primary(self, obj):
""" This is an ugly hack, and can be done much more nicely by
introspecting primary keys...
"""
if hasattr(obj, 'id'):
return obj.id
else:
return obj.username