openmedialibrary/oml/item/query.py
2019-01-17 15:57:55 +05:30

62 lines
2 KiB
Python

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
#does not work in sqlite
#from sqlalchemy.sql.expression import nullslast
from sqlalchemy.sql.expression import text
from . import models
import settings
import utils
import logging
logger = logging.getLogger(__name__)
def parse(data):
query = {}
query['range'] = [0, 100]
if 'group' not in data:
query['sort'] = [{'key': 'title', 'operator': '+'}]
for key in ('keys', 'group', 'list', 'range', 'sort', 'query'):
if key in data:
query[key] = data[key]
if [r for r in query['range'] if not isinstance(r, int)]:
logger.error('range must be 2 integers! got this: %s', query['range'])
query['range'] = [0, 0]
#print data
query['qs'] = models.Item.find(data)
if 'group' not in query:
query['qs'] = order(query['qs'], query['sort'])
return query
def order(qs, sort, prefix='sort.'):
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]
_order_by.append(text(nulls))
_order_by.append(text(order))
order_by = _order_by
qs = qs.join(models.Sort).order_by(*order_by)
return qs