48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
"""Tools for manipulating DBRefs (references to Mongo objects)."""
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import types
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from objectid import ObjectId
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class DBRef(object):
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"""A reference to an object stored in a Mongo database.
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"""
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def __init__(self, collection, id):
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"""Initialize a new DBRef.
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Raises TypeError if collection is not an instance of (str, unicode) or
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id is not an instance of ObjectId.
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Arguments:
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- `collection`: the collection the object is stored in
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- `id`: the value of the object's _id field
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"""
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if not isinstance(collection, types.StringTypes):
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raise TypeError("collection must be an instance of (str, unicode)")
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if not isinstance(id, ObjectId):
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raise TypeError("id must be an instance of ObjectId")
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if isinstance(collection, types.StringType):
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collection = unicode(collection, "utf-8")
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self.__collection = collection
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self.__id = id
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def collection(self):
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"""Get this DBRef's collection as unicode.
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"""
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return self.__collection
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def id(self):
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"""Get this DBRef's _id as an ObjectId.
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"""
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return self.__id
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def __repr__(self):
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return "DBRef(" + repr(self.collection()) + ", " + repr(self.id()) + ")"
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def __cmp__(self, other):
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if isinstance(other, DBRef):
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return cmp([self.collection(), self.id()], [other.collection(), other.id()])
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return NotImplemented
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