File size: 2,731 Bytes
8f59bb3 | 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 | from datetime import datetime
from pymongo import ASCENDING, DESCENDING
from mongo_thingy import Thingy
from mongo_thingy.cursor import Cursor
class RevisionCursor(Cursor):
def __init__(self, *args, **kwargs):
self.thingy = kwargs.pop("thingy", None)
super(RevisionCursor, self).__init__(*args, **kwargs)
def __getitem__(self, index):
if index < 0 and self.thingy:
index = self.thingy.version + index
return super(RevisionCursor, self).__getitem__(index)
class Revision(Thingy):
"""Revision of a document"""
_cursor_cls = RevisionCursor
@classmethod
def from_thingy(cls, thingy, author=None, operation="update"):
if not thingy.versioned:
operation = "create"
version = cls(document_id=thingy.id,
document_type=type(thingy).__name__,
operation=operation)
if operation != "delete":
version.document = thingy.__dict__
if author:
version.author = author
return version
def save(self):
self.creation_date = datetime.utcnow()
return super(Revision, self).save()
Revision.add_index([("document_id", DESCENDING),
("document_type", DESCENDING)])
class Versioned(object):
"""Mixin to versionate changes in a collection"""
_revision_cls = Revision
def get_revisions(self, **kwargs):
filter = {"document_id": self.id,
"document_type": type(self).__name__}
filter.update(kwargs)
return self._revision_cls.find(filter, thingy=self)
@property
def version(self):
return self.get_revisions().count()
@property
def versioned(self):
count = self.get_revisions().limit(1).count(with_limit_and_skip=True)
return bool(count)
@property
def revisions(self):
return self.get_revisions().sort("_id", ASCENDING)
def revert(self):
version = self.version
if version <= 1:
previous_version = {"_id": self.id}
else:
previous_version = self.revisions[-2].document
self.__dict__ = previous_version
return self.save()
def save(self, author=None, **kwargs):
result = super(Versioned, self).save(**kwargs)
version = self._revision_cls.from_thingy(self, author=author)
version.save()
return result
def delete(self, author=None):
result = super(Versioned, self).delete()
version = self._revision_cls.from_thingy(self, author=author,
operation="delete")
version.save()
return result
__all__ = ["Revision", "Versioned"]
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