cablegates/pandora/itemlist/managers.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from datetime import datetime
from django.db.models import Q, Manager
import models
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def parseCondition(condition, user):
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'''
condition: {
value: "war"
}
or
condition: {
key: "year",
value: "1970-1980,
operator: "!="
}
...
'''
k = condition.get('key', 'name')
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k = {
'user': 'user__username',
'position': 'position__position',
}.get(k, k)
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if not k:
k = 'name'
v = condition['value']
op = condition.get('operator', None)
if not op:
op = ''
if op.startswith('!'):
op = op[1:]
exclude = True
else:
exclude = False
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if k == 'id':
v = v.split('/')
if len(v) == 2:
q = Q(user__username=v[0], name=v[1])
else:
q = Q(id__in=[])
return q
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if k == 'subscribed':
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key = 'subscribed_users__username'
v = user.username
elif isinstance(v, bool): #featured and public flag
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key = k
else:
if 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
if exclude:
q = ~Q(**{key: v})
else:
q = Q(**{key: v})
return q
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def parseConditions(conditions, operator, user):
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'''
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'],
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condition.get('operator', '&'), user)
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if q:
conn.append(q)
pass
else:
if condition.get('value', '') != '' or \
condition.get('operator', '') == '=':
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conn.append(parseCondition(condition, user))
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if conn:
q = conn[0]
for c in conn[1:]:
if operator == '|':
q = q | c
else:
q = q & c
return q
return None
class ListManager(Manager):
def get_query_set(self):
return super(ListManager, self).get_query_set()
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()
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conditions = parseConditions(data['query'].get('conditions', []),
data['query'].get('operator', '&'),
user)
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if conditions:
qs = qs.filter(conditions)
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if user.is_anonymous():
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qs = qs.filter(Q(status='public') | Q(status='featured'))
else:
qs = qs.filter(Q(status='public') | Q(status='featured') | Q(user=user))
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return qs