pandora/pandora/item/managers.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
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from datetime import datetime
from django.db.models import Q, Manager
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from itemlist.models import List
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import models
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def parseCondition(condition):
'''
condition: {
value: "war"
}
or
condition: {
key: "year",
value: "1970-1980,
operator: "!="
}
...
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'''
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k = condition.get('key', 'all')
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k = {'id': 'itemId'}.get(k, k)
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if not k:
k = 'all'
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v = condition['value']
op = condition.get('operator', None)
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if not op:
op = ''
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if op.startswith('!'):
op = op[1:]
exclude = True
else:
exclude = False
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key_type = models.site_config()['keys'].get(k, {'type':'string'}).get('type')
if isinstance(key_type, list):
key_type = key_type[0]
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key_type = {
'title': 'string',
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'person': 'string',
'text': 'string',
'year': 'string',
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'length': 'string',
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'list': 'list'
}.get(key_type, key_type)
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if k == 'list':
key_type = 'list'
if key_type == "string":
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in_find=True
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value_key = 'find__value'
if k in models.Item.facet_keys:
in_find = False
if op == '=':
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v = models.Item.objects.filter(facets__key=k, facets__value=v)
elif op == '^':
v = models.Item.objects.filter(facets__key=k, facets__value__istartswith=v)
elif op == '$':
v = models.Item.objects.filter(facets__key=k, facets__value__iendswith=v)
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else:
v = models.Item.objects.filter(facets__key=k, facets__value__icontains=v)
k = 'id__in'
elif op == '=':
value_key = 'find__value__iexact'
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elif op == '^':
v = v[1:]
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value_key = 'find__value__istartswith'
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elif op == '$':
v = v[:-1]
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value_key = 'find__value__iendswith'
else: # default
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value_key = 'find__value__icontains'
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k = str(k)
if exclude:
if k == 'all':
q = ~Q(**{value_key: v})
elif in_find and not k.startswith('itemId'):
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q = ~Q(**{'find__key': k, value_key: v})
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else:
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q = ~Q(**{k: v})
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else:
if k == 'all':
q = Q(**{value_key: v})
elif in_find and not k.startswith('itemId'):
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q = Q(**{'find__key': k, value_key: v})
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else:
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q = Q(**{k: v})
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return q
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elif key_type == 'list':
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q = Q(itemId=False)
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l = v.split("/")
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if len(l) == 2:
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lqs = list(List.objects.filter(name=l[1], user__username=l[0]))
if len(lqs) == 1:
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l = lqs[0]
if l.query.get('static', False) == False:
data = l.query
q = parseConditions(data.get('conditions', []),
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data.get('operator', '&'))
else:
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q = Q(id__in=l.items.all())
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return q
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else: #number or date
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def parseDate(d):
while len(d) < 3:
d.append(1)
return datetime(*[int(i) for i in d])
if op == '-':
v1 = v[1]
v2 = v[2]
if key_type == "date":
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v1 = parseDate(v1.split('.'))
v2 = parseDate(v2.split('.'))
if exclude: #!1960-1970
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k1 = 'value__lt'
k2 = 'value__gte'
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return Q(**{'find__key': k, k1: v1})|Q(**{'find__key': k, k2: v2})
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else: #1960-1970
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k1 = 'value__gte'
k2 = 'value__lt'
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return Q(**{'find__key': k, k1: v1})&Q(**{'find__key': k, k2: v2})
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else:
if key_type == "date":
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v = parseDate(v.split('.'))
if op == '=':
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vk = 'value__exact'
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elif op == '>':
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vk = 'value__gt'
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elif op == '>=':
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vk = 'value__gte'
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elif op == '<':
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vk = 'value__lt'
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elif op == '<=':
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vk = 'value__lte'
elif op == '':
vk = 'value__exact'
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vk = 'find__%s' % vk
vk = str(vk)
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if exclude: #!1960
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return ~Q(**{'find__key': k, vk: v})
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else: #1960
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return Q(**{'find__key': k, vk: v})
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def parseConditions(conditions, operator):
'''
conditions: [
{
value: "war"
}
{
key: "year",
value: "1970-1980,
operator: "!="
},
{
key: "country",
value: "f",
operator: "^"
}
],
operator: "&"
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'''
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conn = []
for condition in conditions:
if 'conditions' in condition:
q = parseConditions(condition['conditions'],
condition.get('operator', '&'))
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if q:
conn.append(q)
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pass
else:
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if condition.get('value', '') != '' or \
condition.get('operator', '') == '=':
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conn.append(parseCondition(condition))
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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
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return Q()
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class ItemManager(Manager):
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def get_query_set(self):
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return super(ItemManager, self).get_query_set()
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def filter_list(self, qs, l, user):
if l != "all":
l = l.split(":")
only_public = True
if not user.is_anonymous():
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if len(l) == 1:
l = [user.username] + l
if user.username == l[0]:
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only_public = False
if len(l) == 2:
lqs = models.List.objects.filter(name=l[1], user__username=l[0])
if only_public:
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lqs = lqs.filter(Q(status='public')|Q(status='featured'))
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if lqs.count() == 1:
if lqs[0].query:
data = lqs[0].query
conditions = parseConditions(data['query']['conditions'],
data['query'].get('operator', '&'))
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qs = qs.filter(conditions)
else:
qs = qs.filter(id__in=lqs[0].items.all())
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return qs
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def find(self, data, user):
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'''
query: {
conditions: [
{
value: "war"
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}
{
key: "year",
value: "1970-1980,
operator: "!="
},
{
key: "country",
value: "f",
operator: "^"
}
],
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operator: "&"
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}
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'''
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#join query with operator
qs = self.get_query_set()
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#only include items that have hard metadata
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qs = qs.filter(available=True)
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conditions = parseConditions(data['query'].get('conditions', []),
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data['query'].get('operator', '&'))
qs = qs.filter(conditions).distinct()
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#anonymous can only see public items
if user.is_anonymous():
qs = qs.filter(public=True)
#users can see public items, there own items and items of there groups
elif not user.is_staff:
qs = qs.filter(Q(public=True)|Q(user=user)|Q(groups__in=user.groups.all()))
#admins can see all available items
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return qs