149 lines
3.8 KiB
Python
149 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
|
|
from django.db.models import Q, Manager
|
|
|
|
import ox
|
|
|
|
from oxdjango.query import QuerySet
|
|
from oxdjango.managers import get_operator
|
|
|
|
keymap = {
|
|
'user': 'user__username',
|
|
'name': 'name_find'
|
|
}
|
|
case_insensitive_keys = ('user__username',)
|
|
default_key = 'name'
|
|
|
|
|
|
def namePredicate(op, value):
|
|
pat = {
|
|
'==': '|%s|',
|
|
'^': '|%s',
|
|
'$': '%s|',
|
|
}.get(op, '%s')
|
|
|
|
return ('name_find__contains', pat % value.lower())
|
|
|
|
|
|
def parseCondition(condition, user, item=None):
|
|
'''
|
|
'''
|
|
k = condition.get('key', default_key)
|
|
k = keymap.get(k, k)
|
|
|
|
v = condition['value']
|
|
op = condition.get('operator')
|
|
if not op:
|
|
op = '='
|
|
|
|
if op.startswith('!'):
|
|
return ~buildCondition(k, op[1:], v)
|
|
else:
|
|
return buildCondition(k, op, v)
|
|
|
|
|
|
def buildCondition(k, op, v):
|
|
find_key = None
|
|
|
|
if k == 'id':
|
|
v = ox.fromAZ(v)
|
|
return Q(**{k: v})
|
|
if isinstance(v, bool):
|
|
key = k
|
|
elif k == 'name_find':
|
|
key, v = namePredicate(op, v)
|
|
else:
|
|
if k == '*':
|
|
k = 'find__value'
|
|
elif k not in ('id', 'user__username', 'type'):
|
|
find_key = k
|
|
k = 'find__value'
|
|
key = k + get_operator(op, 'istr' if k in case_insensitive_keys else 'str')
|
|
key = str(key)
|
|
if find_key:
|
|
return Q(**{'find__key': find_key, key: v})
|
|
q = Q(**{'find__key': find_key, key: v})
|
|
|
|
# TODO: support more elaborate predicates on link targets?
|
|
# Straw man syntax:
|
|
# // entities with 'ABC' in friends:
|
|
# {key: 'link:friends', operator: '==', value: 'ABC'}
|
|
# // entities whose friends have 'science' in their description
|
|
# {key: 'link:friends', operator: '~', value: {
|
|
# key: 'description',
|
|
# operator: '=',
|
|
# value: 'science'
|
|
# }}
|
|
# // entities listed in PQR's friends
|
|
# {key: 'backlink:friends', operator: '==', value: 'PQR'}
|
|
# It's a bit tricky without special syntax because at this point we
|
|
# don't know what the matching entity type is.
|
|
if op == '==':
|
|
try:
|
|
v_ = ox.fromAZ(v)
|
|
except:
|
|
pass
|
|
else:
|
|
q |= Q(links__key=find_key, links__target=v_)
|
|
|
|
return q
|
|
else:
|
|
return Q(**{key: v})
|
|
|
|
|
|
def parseConditions(conditions, operator, user, item=None):
|
|
'''
|
|
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, item)
|
|
if q:
|
|
conn.append(q)
|
|
pass
|
|
else:
|
|
conn.append(parseCondition(condition, user, item))
|
|
if conn:
|
|
q = conn[0]
|
|
for c in conn[1:]:
|
|
if operator == '|':
|
|
q = q | c
|
|
else:
|
|
q = q & c
|
|
return q
|
|
return None
|
|
|
|
|
|
class EntityManager(Manager):
|
|
|
|
def get_query_set(self):
|
|
return QuerySet(self.model)
|
|
|
|
def find(self, data, user, item=None):
|
|
#join query with operator
|
|
qs = self.get_query_set()
|
|
query = data.get('query', {})
|
|
conditions = parseConditions(query.get('conditions', []),
|
|
query.get('operator', '&'),
|
|
user, item)
|
|
if conditions:
|
|
qs = qs.filter(conditions).distinct()
|
|
|
|
return qs
|
|
|