/usr/lib/python2.7/dist-packages/bson/dbref.py is in python-bson 3.6.1+dfsg1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | # Copyright 2009-2015 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Tools for manipulating DBRefs (references to MongoDB documents)."""
from copy import deepcopy
from bson.py3compat import iteritems, string_type
from bson.son import SON
class DBRef(object):
"""A reference to a document stored in MongoDB.
"""
# DBRef isn't actually a BSON "type" so this number was arbitrarily chosen.
_type_marker = 100
def __init__(self, collection, id, database=None, _extra={}, **kwargs):
"""Initialize a new :class:`DBRef`.
Raises :class:`TypeError` if `collection` or `database` is not
an instance of :class:`basestring` (:class:`str` in python 3).
`database` is optional and allows references to documents to work
across databases. Any additional keyword arguments will create
additional fields in the resultant embedded document.
:Parameters:
- `collection`: name of the collection the document is stored in
- `id`: the value of the document's ``"_id"`` field
- `database` (optional): name of the database to reference
- `**kwargs` (optional): additional keyword arguments will
create additional, custom fields
.. mongodoc:: dbrefs
"""
if not isinstance(collection, string_type):
raise TypeError("collection must be an "
"instance of %s" % string_type.__name__)
if database is not None and not isinstance(database, string_type):
raise TypeError("database must be an "
"instance of %s" % string_type.__name__)
self.__collection = collection
self.__id = id
self.__database = database
kwargs.update(_extra)
self.__kwargs = kwargs
@property
def collection(self):
"""Get the name of this DBRef's collection as unicode.
"""
return self.__collection
@property
def id(self):
"""Get this DBRef's _id.
"""
return self.__id
@property
def database(self):
"""Get the name of this DBRef's database.
Returns None if this DBRef doesn't specify a database.
"""
return self.__database
def __getattr__(self, key):
try:
return self.__kwargs[key]
except KeyError:
raise AttributeError(key)
# Have to provide __setstate__ to avoid
# infinite recursion since we override
# __getattr__.
def __setstate__(self, state):
self.__dict__.update(state)
def as_doc(self):
"""Get the SON document representation of this DBRef.
Generally not needed by application developers
"""
doc = SON([("$ref", self.collection),
("$id", self.id)])
if self.database is not None:
doc["$db"] = self.database
doc.update(self.__kwargs)
return doc
def __repr__(self):
extra = "".join([", %s=%r" % (k, v)
for k, v in iteritems(self.__kwargs)])
if self.database is None:
return "DBRef(%r, %r%s)" % (self.collection, self.id, extra)
return "DBRef(%r, %r, %r%s)" % (self.collection, self.id,
self.database, extra)
def __eq__(self, other):
if isinstance(other, DBRef):
us = (self.__database, self.__collection,
self.__id, self.__kwargs)
them = (other.__database, other.__collection,
other.__id, other.__kwargs)
return us == them
return NotImplemented
def __ne__(self, other):
return not self == other
def __hash__(self):
"""Get a hash value for this :class:`DBRef`."""
return hash((self.__collection, self.__id, self.__database,
tuple(sorted(self.__kwargs.items()))))
def __deepcopy__(self, memo):
"""Support function for `copy.deepcopy()`."""
return DBRef(deepcopy(self.__collection, memo),
deepcopy(self.__id, memo),
deepcopy(self.__database, memo),
deepcopy(self.__kwargs, memo))
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