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import re
from django.db.models import Q
def normalize_query(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 get_query(query_string, 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.
"""
query = None # Query to search for every search term
terms = normalize_query(query_string)
for term in terms:
or_query = None # Query to search for a given term in each field
for field_name in search_fields:
q = Q(**{"%s__icontains" % field_name: term})
if or_query is None:
or_query = q
else:
or_query = or_query | q
if query is None:
query = or_query
else:
query = query & or_query
return query
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