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905 store min max date in metadata for versionstore #952

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905 store min max date in metadata for versionstore #952

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23 changes: 22 additions & 1 deletion arctic/store/version_store.py
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Original file line number Diff line number Diff line change
Expand Up @@ -610,6 +610,27 @@ def append(self, symbol, data, metadata=None, prune_previous_version=True, upser
metadata=version.pop('metadata', None), data=None,
host=self._arctic_lib.arctic.mongo_host)


def _add_min_max_date_to_metadata(self, metadata, data):
min_data=max_date = None

if 'date' in data.index.names:
dates = data.index.get_level_values('date')
min_date = dates.min()
max_date = dates.max()

elif 'date' in data.columns:
min_date = data['date'].min()
max_date = data['date'].max()

metadata = metadata or {}

if 'min_date' not in metadata and 'max_date' not in metadata:
metadata['min_date'] = min_date
metadata['max_date'] = max_date

return metadata

@mongo_retry
def write(self, symbol, data, metadata=None, prune_previous_version=True, **kwargs):
"""
Expand Down Expand Up @@ -642,7 +663,7 @@ def write(self, symbol, data, metadata=None, prune_previous_version=True, **kwar
version['version'] = self._version_nums.find_one_and_update({'symbol': symbol},
{'$inc': {'version': 1}},
upsert=True, new=True)['version']
version['metadata'] = metadata
version['metadata'] = self._add_min_max_date_to_metadata(metadata, data)

previous_version = self._versions.find_one({'symbol': symbol, 'version': {'$lt': version['version']}},
sort=[('version', pymongo.DESCENDING)])
Expand Down