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filter_parser.py
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filter_parser.py
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import datetime
import operator
import re
from functools import reduce
from dateutil.relativedelta import relativedelta
from django.db.models import Q
FILTER_FROM_NOW = re.compile(r'([+-]?\d+)(\w)')
class FilterParser(object):
or_sep = ','
def __init__(self, queryset, filters_dict, exclude_mode=False):
self.filters = filters_dict
if exclude_mode:
self.queryset_func = queryset.exclude
else:
self.queryset_func = queryset.filter
def get_queryset(self):
parsed_kwargs = {}
parsed_args = []
for key, value in self.filters.items():
params = key.split('|')
if len(params) == 1:
parsed_kwargs[key] = value
elif len(params) == 2:
filter_func = getattr(self, 'filter_' + params[1], None)
if not filter_func:
continue
args, kwargs = filter_func(params[0], value)
parsed_args.extend(args)
parsed_kwargs.update(kwargs)
else:
continue
return self.queryset_func(*parsed_args, **parsed_kwargs)
def _filter_operator(self, key, value, op):
return reduce(op, [Q(**{key: v}) for v in value])
def filter_or(self, key, value):
norm_val = value.split(self.or_sep)
return [self._filter_operator(key, norm_val, operator.or_)], {}
def filter_and(self, key, value):
return [self._filter_operator(key, value, operator.and_)], {}
def filter_from_now(self, key, value):
period_mapper = {
'd': 'days',
'm': 'months',
'y': 'years',
}
val, period = FILTER_FROM_NOW.match(value).groups()
result = datetime.date.today() + relativedelta(**{
period_mapper.get(period): int(val)
})
return [], {key: result.strftime('%Y-%m-%d')}