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updated map/reduce documentation

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blackbrrr 2010-02-12 16:07:44 -06:00
parent a4c5fa57e0
commit 008a62e4e9
2 changed files with 10 additions and 14 deletions
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21
mongoengine/queryset.py
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@ -388,27 +388,22 @@ class QuerySet(object):
it must be the last call made, as it does not return a maleable it must be the last call made, as it does not return a maleable
``QuerySet``. ``QuerySet``.
Example: map/reduce operation is given a ``QuerySet`` See the :meth:`~mongoengine.tests.QuerySetTest.test_map_reduce`
of all posts by "mattdennewitz", ordered by most recent "pub_date". :: and :meth:`~mongoengine.tests.QuerySetTest.test_map_advanced`
tests in ``tests.queryset.QuerySetTest`` for usage examples.
map_f = function() { ... }
reduce_f = function(key, values) { ... }
posts = BlogPost(author="mattdennewitz").order_by("-pub_date")
tag_counts = posts.map_reduce(map_f, reduce_f)
See the :meth:`~mongoengine.tests.QuerySetTest.test_map_reduce_simple`
unit test for more usage examples.
:param map_f: map function, as :class:`~pymongo.code.Code` or string :param map_f: map function, as :class:`~pymongo.code.Code` or string
:param reduce_f: reduce function, as :param reduce_f: reduce function, as
:class:`~pymongo.code.Code` or string :class:`~pymongo.code.Code` or string
:param finalize_f: finalize function, an optional function that
performs any post-reduction processing.
:param scope: values to insert into map/reduce global scope. Optional. :param scope: values to insert into map/reduce global scope. Optional.
:param limit: number of objects from current query to provide :param limit: number of objects from current query to provide
to map/reduce method to map/reduce method
:param keep_temp: keep temporary table (boolean, default ``True``) :param keep_temp: keep temporary table (boolean, default ``True``)
Returns a list of :class:`~mongoengine.document.MapReduceDocument`. Returns an iterator yielding
:class:`~mongoengine.document.MapReduceDocument`.
.. note:: Map/Reduce requires server version **>= 1.1.1**. The PyMongo .. note:: Map/Reduce requires server version **>= 1.1.1**. The PyMongo
:meth:`~pymongo.collection.Collection.map_reduce` helper requires :meth:`~pymongo.collection.Collection.map_reduce` helper requires
@ -416,8 +411,6 @@ class QuerySet(object):
.. versionadded:: 0.2.2 .. versionadded:: 0.2.2
.. todo:: Implement limits
""" """
from document import MapReduceDocument from document import MapReduceDocument

3
tests/queryset.py
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@ -601,7 +601,10 @@ class QuerySetTest(unittest.TestCase):
results = results.map_reduce(map_f, reduce_f, finalize_f=finalize_f) results = results.map_reduce(map_f, reduce_f, finalize_f=finalize_f)
results = list(results) results = list(results)
# assert troublesome Buzz article is ranked 1st
self.assertTrue(results[0].object.title.startswith("Google Buzz")) self.assertTrue(results[0].object.title.startswith("Google Buzz"))
# assert laser vision is ranked last
self.assertTrue(results[-1].object.title.startswith("How to see")) self.assertTrue(results[-1].object.title.startswith("How to see"))
Link.drop_collection() Link.drop_collection()