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contego / home / tvault / .virtenv / lib / python2.7 / site-packages / nova / db / sqlalchemy / api.pyc
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    matching. Exact matching is applied for the following filters::

    |   ['project_id', 'user_id', 'image_ref',
    |    'vm_state', 'instance_type_id', 'uuid',
    |    'metadata', 'host', 'system_metadata']


    A third type of filter (also using exact matching), filters
    based on instance metadata tags when supplied under a special
    key named 'filter'::

    |   filters = {
    |       'filter': [
    |           {'name': 'tag-key', 'value': '<metakey>'},
    |           {'name': 'tag-value', 'value': '<metaval>'},
    |           {'name': 'tag:<metakey>', 'value': '<metaval>'}
    |       ]
    |   }

    Special keys are used to tweek the query further::

    |   'changes-since' - only return instances updated after
    |   'deleted' - only return (or exclude) deleted instances
    |   'soft_deleted' - modify behavior of 'deleted' to either
    |                    include or exclude instances whose
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    A fourth type of filter (also using exact matching), filters
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    `tags` -- One or more strings that will be used to filter results
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    `tags-any` -- One or more strings that will be used to filter results in
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    `not-tags` -- One or more strings that will be used to filter results in
            an NOT AND expression: NOT (T1 AND T2)

    `not-tags-any` -- One or more strings that will be used to filter results
            in an NOT OR expression: NOT (T1 OR T2)

    Tags should be represented as list::

    |    filters = {
    |        'tags': [some-tag, some-another-tag],
    |        'tags-any: [some-any-tag, some-another-any-tag],
    |        'not-tags: [some-not-tag, some-another-not-tag],
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    |    }

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