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a/Allura/allura/model/artifact.py b/Allura/allura/model/artifact.py
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    class __mongometa__:
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    class __mongometa__:
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        session = project_orm_session
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        session = project_orm_session
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        name = 'artifact_feed'
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        name = 'artifact_feed'
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        indexes = [
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        indexes = [
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            'pubdate',
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            'pubdate',
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            ('artifact_ref.project_id', 'artifact_ref.mount_point') ]
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            ('artifact_ref.project_id', 'artifact_ref.mount_point'),
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            (('ref_id', pymongo.ASCENDING),
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             ('pubdate', pymongo.DESCENDING))]
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    _id = FieldProperty(S.ObjectId)
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    _id = FieldProperty(S.ObjectId)
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    ref_id = ForeignIdProperty('ArtifactReference')
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    ref_id = ForeignIdProperty('ArtifactReference')
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    neighborhood_id = ForeignIdProperty('Neighborhood')
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    neighborhood_id = ForeignIdProperty('Neighborhood')
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    project_id = ForeignIdProperty('Project')
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    project_id = ForeignIdProperty('Project')