Initial refactor of the search app to better support related fields lookups, trying to fix issue #20 in the application side
This commit is contained in:
Roberto Rosario
222
apps/dynamic_search/classes.py
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222
apps/dynamic_search/classes.py
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from __future__ import absolute_import
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import re
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import types
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import logging
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import datetime
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from django.db.models import Q
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from django.db.models.loading import get_model
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from .conf.settings import LIMIT
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logger = logging.getLogger(__name__)
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class SearchModel(object):
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registry = {}
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@classmethod
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def get_all(cls):
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return cls.registry.values()
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def __init__(self, app_label, model_name, label=None):
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self.app_label = app_label
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self.model_name = model_name
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self.search_fields = []
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self.model = get_model(app_label, model_name)
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self.label = label or self.model._meta.verbose_name
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self.__class__.registry[id(self)] = self
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def get_fields_simple_list(self):
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"""
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Returns a list of the fields for the SearchModel
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"""
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result = []
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for search_field in self.search_fields:
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result.append((search_field.get_full_name(), search_field.label))
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return result
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def add_model_field(self, *args, **kwargs):
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"""
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Add a search field that directly belongs to the parent SearchModel
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"""
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self.search_fields.append(SearchField(self, *args, **kwargs))
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def add_related_field(self, *args, **kwargs):
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"""
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Add a search field that will search content in a related field in
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a separate model
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"""
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self.search_fields.append(RelatedSearchField(self, *args, **kwargs))
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def normalize_query(self, query_string,
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findterms=re.compile(r'"([^"]+)"|(\S+)').findall,
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normspace=re.compile(r'\s{2,}').sub):
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"""
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Splits the query string in invidual keywords, getting rid of unecessary spaces
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and grouping quoted words together.
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Example:
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>>> normalize_query(' some random words "with quotes " and spaces')
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['some', 'random', 'words', 'with quotes', 'and', 'spaces']
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"""
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return [normspace(' ', (t[0] or t[1]).strip()) for t in findterms(query_string)]
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def simple_search(self, query_string):
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search_dict = {}
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model_list = {}
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flat_list = []
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result_count = 0
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shown_result_count = 0
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elapsed_time = 0
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start_time = datetime.datetime.now()
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for search_field in self.search_fields:
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search_dict.setdefault(search_field.get_model(), {
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'query_entries': [],
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'label': search_field.label,
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'return_value': search_field.return_value
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})
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search_dict[search_field.get_model()]['query_entries'].append(
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{
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'field_name': [search_field.field],
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'terms': self.normalize_query(query_string)
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}
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)
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logger.debug('search_dict: %s' % search_dict)
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for model, data in search_dict.items():
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label = data['label']
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queries = []
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for query_entry in data['query_entries']:
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queries.extend(self.assemble_query(query_entry['terms'], query_entry['field_name']))
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# Initialize per SearchFiel model id result list
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model_result_ids = set()
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for query in queries:
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logger.debug('query: %s' % query)
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# Get results per search field
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field_result_ids = set(model.objects.filter(query).values_list(data['return_value'], flat=True))
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# Convert the QuerySet to a Python set and perform the
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# AND operation on the program and not as a query.
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# This operation ANDs all the SearchField results
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# belonging to a single model, making sure to only include
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# results in the model result variable if all the terms
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# are found in a single field
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if not model_result_ids:
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model_result_ids = field_result_ids
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else:
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model_result_ids &= field_result_ids
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logger.debug('field_result_ids: %s' % field_result_ids)
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logger.debug('model_result_ids: %s' % model_result_ids)
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# Update the search result total count
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result_count += len(model_result_ids)
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# Search the field results return values (PK) in the SearchModel's model
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results = self.model.objects.in_bulk(list(model_result_ids)[: LIMIT]).values()
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# Update the search result visible count (limited by LIMIT config option)
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shown_result_count += len(results)
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if results:
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model_list[label] = results
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for result in results:
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if result not in flat_list:
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flat_list.append(result)
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logger.debug('model_list: %s' % model_list)
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logger.debug('flat_list: %s' % flat_list)
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elapsed_time = unicode(datetime.datetime.now() - start_time).split(':')[2]
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return model_list, flat_list, shown_result_count, result_count, elapsed_time
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def advanced_search(self, dictionary):
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for key, value in dictionary.items():
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try:
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model, field_name = key.split('__', 1)
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model_entry = registered_search_dict.get(model, {})
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if model_entry:
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for model_field in model_entry.get('fields', [{}]):
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if model_field.get('name') == field_name:
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search_dict.setdefault(model_entry['model'], {'query_entries': [], 'label': model_entry['label']})
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search_dict[model_entry['model']]['query_entries'].append(
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{
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'field_name': [field_name],
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'terms': normalize_query(value.strip())
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}
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)
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except ValueError:
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pass
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def assemble_query(self, terms, search_fields):
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"""
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Returns a query, that is a combination of Q objects. That combination
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aims to search keywords within a model by testing the given search fields.
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"""
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queries = []
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for term in terms:
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or_query = None
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for field in search_fields:
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if isinstance(field, types.StringTypes):
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comparison = u'icontains'
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field_name = field
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elif isinstance(field, types.DictType):
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comparison = field.get('comparison', u'icontains')
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field_name = field.get('field_name', u'')
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if field_name:
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q = Q(**{'%s__%s' % (field_name, comparison): term})
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if or_query is None:
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or_query = q
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else:
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or_query = or_query | q
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queries.append(or_query)
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return queries
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# SearchField classes
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class SearchField(object):
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"""
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Search for terms in fields that directly belong to the parent SearchModel
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"""
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def __init__(self, search_model, field, label):
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self.search_model = search_model
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self.field = field
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self.label = label
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self.return_value = 'pk'
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def get_full_name(self):
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return self.field
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def get_model(self):
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return self.search_model.model
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class RelatedSearchField(object):
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"""
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Search for terms in fields that are related to the parent SearchModel
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"""
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def __init__(self, search_model, app_label, model_name, field, return_value, label):
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self.search_model = search_model
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self.app_label = app_label
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self.model_name = model_name
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self.field = field
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self.return_value = return_value
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self.model = get_model(app_label, model_name)
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self.label = label
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def get_full_name(self):
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return '%s.%s.%s' % (self.app_label, self.model_name, self.field)
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def get_model(self):
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return self.model
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