openmedialibrary/oml/item/query.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
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#does not work in sqlite
#from sqlalchemy.sql.expression import nullslast
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from sqlalchemy.sql.expression import text
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from . import models
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import settings
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import utils
def parse(data):
query = {}
query['range'] = [0, 100]
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if not 'group' in data:
query['sort'] = [{'key':'title', 'operator':'+'}]
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for key in ('keys', 'group', 'list', 'range', 'sort', 'query'):
if key in data:
query[key] = data[key]
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#print data
query['qs'] = models.Item.find(data)
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if not 'group' in query:
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query['qs'] = order(query['qs'], query['sort'])
return query
def order(qs, sort, prefix='sort.'):
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order_by = []
if len(sort) == 1:
additional_sort = settings.config['user']['ui']['listSort']
key = utils.get_by_id(models.Item.item_keys, sort[0]['key'])
for s in key.get('additionalSort', additional_sort):
if s['key'] not in [e['key'] for e in sort]:
sort.append(s)
for e in sort:
operator = e['operator']
if operator != '-':
operator = ''
else:
operator = ' DESC'
key = {}.get(e['key'], e['key'])
if key not in ('fixme', ):
key = "%s%s" % (prefix, key)
order = '%s%s' % (key, operator)
order_by.append(order)
if order_by:
#nulllast not supported in sqlite, use IS NULL hack instead
#order_by = map(nullslast, order_by)
_order_by = []
for order in order_by:
nulls = "%s IS NULL" % order.split(' ')[0]
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_order_by.append(text(nulls))
_order_by.append(text(order))
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order_by = _order_by
qs = qs.join(models.Sort).order_by(*order_by)
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return qs