223 lines
8.0 KiB
Python
223 lines
8.0 KiB
Python
from __future__ import absolute_import
|
|
|
|
import re
|
|
import types
|
|
import logging
|
|
import datetime
|
|
|
|
from django.db.models import Q
|
|
from django.db.models.loading import get_model
|
|
|
|
from .conf.settings import LIMIT
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class SearchModel(object):
|
|
registry = {}
|
|
|
|
@classmethod
|
|
def get_all(cls):
|
|
return cls.registry.values()
|
|
|
|
def __init__(self, app_label, model_name, label=None):
|
|
self.app_label = app_label
|
|
self.model_name = model_name
|
|
self.search_fields = []
|
|
self.model = get_model(app_label, model_name)
|
|
self.label = label or self.model._meta.verbose_name
|
|
self.__class__.registry[id(self)] = self
|
|
|
|
def get_fields_simple_list(self):
|
|
"""
|
|
Returns a list of the fields for the SearchModel
|
|
"""
|
|
result = []
|
|
for search_field in self.search_fields:
|
|
result.append((search_field.get_full_name(), search_field.label))
|
|
|
|
return result
|
|
|
|
def add_model_field(self, *args, **kwargs):
|
|
"""
|
|
Add a search field that directly belongs to the parent SearchModel
|
|
"""
|
|
self.search_fields.append(SearchField(self, *args, **kwargs))
|
|
|
|
def add_related_field(self, *args, **kwargs):
|
|
"""
|
|
Add a search field that will search content in a related field in
|
|
a separate model
|
|
"""
|
|
self.search_fields.append(RelatedSearchField(self, *args, **kwargs))
|
|
|
|
def normalize_query(self, query_string,
|
|
findterms=re.compile(r'"([^"]+)"|(\S+)').findall,
|
|
normspace=re.compile(r'\s{2,}').sub):
|
|
"""
|
|
Splits the query string in invidual keywords, getting rid of unecessary spaces
|
|
and grouping quoted words together.
|
|
Example:
|
|
>>> normalize_query(' some random words "with quotes " and spaces')
|
|
['some', 'random', 'words', 'with quotes', 'and', 'spaces']
|
|
"""
|
|
return [normspace(' ', (t[0] or t[1]).strip()) for t in findterms(query_string)]
|
|
|
|
def simple_search(self, query_string):
|
|
search_dict = {}
|
|
model_list = {}
|
|
flat_list = []
|
|
result_count = 0
|
|
shown_result_count = 0
|
|
elapsed_time = 0
|
|
start_time = datetime.datetime.now()
|
|
|
|
for search_field in self.search_fields:
|
|
search_dict.setdefault(search_field.get_model(), {
|
|
'query_entries': [],
|
|
'label': search_field.label,
|
|
'return_value': search_field.return_value
|
|
})
|
|
search_dict[search_field.get_model()]['query_entries'].append(
|
|
{
|
|
'field_name': [search_field.field],
|
|
'terms': self.normalize_query(query_string)
|
|
}
|
|
)
|
|
|
|
logger.debug('search_dict: %s' % search_dict)
|
|
|
|
for model, data in search_dict.items():
|
|
label = data['label']
|
|
queries = []
|
|
|
|
for query_entry in data['query_entries']:
|
|
queries.extend(self.assemble_query(query_entry['terms'], query_entry['field_name']))
|
|
|
|
# Initialize per SearchFiel model id result list
|
|
model_result_ids = set()
|
|
|
|
for query in queries:
|
|
logger.debug('query: %s' % query)
|
|
|
|
# Get results per search field
|
|
field_result_ids = set(model.objects.filter(query).values_list(data['return_value'], flat=True))
|
|
|
|
# Convert the QuerySet to a Python set and perform the
|
|
# AND operation on the program and not as a query.
|
|
# This operation ANDs all the SearchField results
|
|
# belonging to a single model, making sure to only include
|
|
# results in the model result variable if all the terms
|
|
# are found in a single field
|
|
if not model_result_ids:
|
|
model_result_ids = field_result_ids
|
|
else:
|
|
model_result_ids &= field_result_ids
|
|
|
|
logger.debug('field_result_ids: %s' % field_result_ids)
|
|
logger.debug('model_result_ids: %s' % model_result_ids)
|
|
|
|
# Update the search result total count
|
|
result_count += len(model_result_ids)
|
|
|
|
# Search the field results return values (PK) in the SearchModel's model
|
|
results = self.model.objects.in_bulk(list(model_result_ids)[: LIMIT]).values()
|
|
|
|
# Update the search result visible count (limited by LIMIT config option)
|
|
shown_result_count += len(results)
|
|
|
|
if results:
|
|
model_list[label] = results
|
|
for result in results:
|
|
if result not in flat_list:
|
|
flat_list.append(result)
|
|
|
|
logger.debug('model_list: %s' % model_list)
|
|
logger.debug('flat_list: %s' % flat_list)
|
|
|
|
elapsed_time = unicode(datetime.datetime.now() - start_time).split(':')[2]
|
|
|
|
return model_list, flat_list, shown_result_count, result_count, elapsed_time
|
|
|
|
def advanced_search(self, dictionary):
|
|
for key, value in dictionary.items():
|
|
try:
|
|
model, field_name = key.split('__', 1)
|
|
model_entry = registered_search_dict.get(model, {})
|
|
if model_entry:
|
|
for model_field in model_entry.get('fields', [{}]):
|
|
if model_field.get('name') == field_name:
|
|
search_dict.setdefault(model_entry['model'], {'query_entries': [], 'label': model_entry['label']})
|
|
search_dict[model_entry['model']]['query_entries'].append(
|
|
{
|
|
'field_name': [field_name],
|
|
'terms': normalize_query(value.strip())
|
|
}
|
|
)
|
|
except ValueError:
|
|
pass
|
|
|
|
def assemble_query(self, terms, search_fields):
|
|
"""
|
|
Returns a query, that is a combination of Q objects. That combination
|
|
aims to search keywords within a model by testing the given search fields.
|
|
"""
|
|
queries = []
|
|
for term in terms:
|
|
or_query = None
|
|
for field in search_fields:
|
|
if isinstance(field, types.StringTypes):
|
|
comparison = u'icontains'
|
|
field_name = field
|
|
elif isinstance(field, types.DictType):
|
|
comparison = field.get('comparison', u'icontains')
|
|
field_name = field.get('field_name', u'')
|
|
|
|
if field_name:
|
|
q = Q(**{'%s__%s' % (field_name, comparison): term})
|
|
if or_query is None:
|
|
or_query = q
|
|
else:
|
|
or_query = or_query | q
|
|
|
|
queries.append(or_query)
|
|
return queries
|
|
|
|
|
|
# SearchField classes
|
|
class SearchField(object):
|
|
"""
|
|
Search for terms in fields that directly belong to the parent SearchModel
|
|
"""
|
|
def __init__(self, search_model, field, label):
|
|
self.search_model = search_model
|
|
self.field = field
|
|
self.label = label
|
|
self.return_value = 'pk'
|
|
|
|
def get_full_name(self):
|
|
return self.field
|
|
|
|
def get_model(self):
|
|
return self.search_model.model
|
|
|
|
|
|
class RelatedSearchField(object):
|
|
"""
|
|
Search for terms in fields that are related to the parent SearchModel
|
|
"""
|
|
def __init__(self, search_model, app_label, model_name, field, return_value, label):
|
|
self.search_model = search_model
|
|
self.app_label = app_label
|
|
self.model_name = model_name
|
|
self.field = field
|
|
self.return_value = return_value
|
|
self.model = get_model(app_label, model_name)
|
|
self.label = label
|
|
|
|
def get_full_name(self):
|
|
return '%s.%s.%s' % (self.app_label, self.model_name, self.field)
|
|
|
|
def get_model(self):
|
|
return self.model
|