143 lines
3.4 KiB
Python
143 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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from datetime import datetime
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from django.db.models import Q, Manager
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import models
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def parseCondition(condition, user):
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'''
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condition: {
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value: "war"
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}
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or
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condition: {
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key: "year",
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value: "1970-1980,
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operator: "!="
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}
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...
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'''
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k = condition.get('key', 'name')
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k = {
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'user': 'user__username',
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'position': 'position__position',
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}.get(k, k)
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if not k:
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k = 'name'
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v = condition['value']
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op = condition.get('operator', None)
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if not op:
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op = ''
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if op.startswith('!'):
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op = op[1:]
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exclude = True
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else:
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exclude = False
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if k == 'subscribed':
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key = 'subscribed_users__username'
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v = user.username
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elif isinstance(v, bool): #featured and public flag
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key = k
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else:
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if op == '=':
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key = '%s__iexact'%k
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elif op == '^':
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v = v[1:]
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key = '%s__istartswith'%k
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elif op == '$':
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v = v[:-1]
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key = '%s__iendswith'%k
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else: # default
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key = '%s__icontains'%k
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if exclude:
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q = ~Q(**{key: v})
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else:
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q = Q(**{key: v})
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return q
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def parseConditions(conditions, operator, user):
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'''
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conditions: [
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{
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value: "war"
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}
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{
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key: "year",
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value: "1970-1980,
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operator: "!="
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},
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{
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key: "country",
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value: "f",
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operator: "^"
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}
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],
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operator: "&"
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'''
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conn = []
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for condition in conditions:
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if 'conditions' in condition:
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q = parseConditions(condition['conditions'],
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condition.get('operator', '&'), user)
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if q:
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conn.append(q)
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pass
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else:
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if condition.get('value', '') != '' or \
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condition.get('operator', '') == '=':
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conn.append(parseCondition(condition, user))
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if conn:
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q = conn[0]
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for c in conn[1:]:
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if operator == '|':
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q = q | c
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else:
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q = q & c
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return q
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return None
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class ListManager(Manager):
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def get_query_set(self):
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return super(ListManager, self).get_query_set()
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def find(self, data, user):
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'''
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query: {
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conditions: [
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{
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value: "war"
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}
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{
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key: "year",
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value: "1970-1980,
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operator: "!="
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},
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{
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key: "country",
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value: "f",
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operator: "^"
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}
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],
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operator: "&"
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}
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'''
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#join query with operator
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qs = self.get_query_set()
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conditions = parseConditions(data['query'].get('conditions', []),
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data['query'].get('operator', '&'),
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user)
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if conditions:
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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'))
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else:
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qs = qs.filter(Q(status='public') | Q(status='featured') | Q(user=user))
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return qs
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