cablegates/pandora/annotation/managers.py
2011-06-20 17:27:06 +02:00

155 lines
3.8 KiB
Python

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from django.db.models import Q, Manager
from ox.django.query import QuerySet
import ox
def parseCondition(condition, user):
'''
condition: {
value: "war"
}
or
condition: {
key: "year",
value: "1970-1980,
operator: "!="
}
...
'''
k = condition.get('key', 'name')
k = {
'user': 'user__username',
'place': 'places__name',
}.get(k, k)
if not k:
k = 'name'
v = condition['value']
op = condition.get('operator')
if not op:
op = ''
if op.startswith('!'):
op = op[1:]
exclude = True
else:
exclude = False
if op == '-':
q = parseCondition({'key': k, 'value': v[0], 'operator': '>='}, user) \
& parseCondition({'key': k, 'value': v[1], 'operator': '<'}, user)
if exclude:
return ~q
else:
return q
if k == 'id':
v = ox.from32(v)
if isinstance(v, bool): #featured and public flag
key = k
elif k in ('lat', 'lng', 'area', 'south', 'west', 'north', 'east', 'matches', 'id'):
if op == '>':
key = '%s__gt'%k
elif op == '>=':
key = '%s__gte'%k
elif op == '<':
key = '%s__lt'%k
elif op == '<=':
key = '%s__lte'%k
else: #default is exact match
key = k
else:
if op == '=' or op == '^$':
key = '%s__iexact'%k
elif op == '^':
v = v[1:]
key = '%s__istartswith'%k
elif op == '$':
v = v[:-1]
key = '%s__iendswith'%k
else: # default
key = '%s__icontains'%k
key = str(key)
if exclude:
q = ~Q(**{key: v})
else:
q = Q(**{key: v})
return q
def parseConditions(conditions, operator, user):
'''
conditions: [
{
value: "war"
}
{
key: "year",
value: "1970-1980,
operator: "!="
},
{
key: "country",
value: "f",
operator: "^"
}
],
operator: "&"
'''
conn = []
for condition in conditions:
if 'conditions' in condition:
q = parseConditions(condition['conditions'],
condition.get('operator', '&'), user)
if q:
conn.append(q)
pass
else:
if condition.get('value', '') != '' or \
condition.get('operator', '') == '=':
conn.append(parseCondition(condition, user))
if conn:
q = conn[0]
for c in conn[1:]:
if operator == '|':
q = q | c
else:
q = q & c
return q
return None
class AnnotationManager(Manager):
def get_query_set(self):
return QuerySet(self.model)
def find(self, data, user):
'''
query: {
conditions: [
{
value: "war"
}
{
key: "year",
value: "1970-1980,
operator: "!="
},
{
key: "country",
value: "f",
operator: "^"
}
],
operator: "&"
}
'''
#join query with operator
qs = self.get_query_set()
conditions = parseConditions(data.get('query', {}).get('conditions', []),
data.get('query', {}).get('operator', '&'),
user)
if conditions:
qs = qs.filter(conditions)
return qs