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Merge pull request #1748 from MITx/fix/cdodge/limit-fields-in-metadata-cache-computation

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optimize the result-set that gets returned from Mongo on metadata inheri...
This commit is contained in:
Calen Pennington
2013-03-27 03:22:00 -07:00
parent 8abba39590 195fd2d1fe
commit 772e805eb6
1 changed files with 7 additions and 2 deletions
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9
common/lib/xmodule/xmodule/modulestore/mongo.py
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@@ -267,8 +267,13 @@ class MongoModuleStore(ModuleStoreBase):
'_id.course': location.course,
'_id.category': {'$in': ['course', 'chapter', 'sequential', 'vertical']}
}
# we just want the Location, children, and metadata
record_filter = {'_id': 1, 'definition.children': 1, 'metadata': 1}
# we just want the Location, children, and inheritable metadata
record_filter = {'_id': 1, 'definition.children': 1}
# just get the inheritable metadata since that is all we need for the computation
# this minimizes both data pushed over the wire
for attr in INHERITABLE_METADATA:
record_filter['metadata.{0}'.format(attr)] = 1
# call out to the DB
resultset = self.collection.find(query, record_filter)