import re
from django.db.models import Q
from forum.models.question import Question, QuestionManager
from forum.modules import decorate

word_re = re.compile(r'\w+', re.UNICODE)

@decorate(QuestionManager.search, needs_origin=False)
def question_search(self, keywords):
    tsquery = " | ".join(word_re.findall(keywords))
    ilike = keywords + u"%%"

    return self.extra(
            tables = ['forum_rootnode_doc'],
            select={
            'ranking': """
                                rank_exact_matches(ts_rank_cd('{0.1, 0.2, 0.8, 1.0}'::float4[], "forum_rootnode_doc"."document", to_tsquery('english', %s), 32))
                                """,
            },
            where=["""
                           "forum_rootnode_doc"."node_id" = "forum_node"."id" AND ("forum_rootnode_doc"."document" @@ to_tsquery('english', %s) OR
                           "forum_node"."title" ILIKE %s)
                           """],
            params=[tsquery, ilike],
            select_params=[tsquery],
            order_by=['-ranking']
            )