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FIX: Improve Topic.similar_to with better Topic#title matches.

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This changes PG text search to only match the given title against
lexemes that are formed from the title. Likewise, the given raw will
only be matched against lexemes that are formed from the post's raw.
This commit is contained in:
Guo Xiang Tan
2020-07-28 11:53:25 +08:00
parent 14003abc37
commit 597d542c33
3 changed files with 49 additions and 20 deletions
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16
lib/search.rb
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@ -1025,13 +1025,25 @@ class Search
end
def self.ts_query(term: , ts_config: nil, joiner: nil, weight_filter: nil)
to_tsquery(
ts_config: ts_config,
term: set_tsquery_weight_filter(term, weight_filter),
joiner: joiner
)
end
def self.to_tsquery(ts_config: nil, term:, joiner: nil)
ts_config = ActiveRecord::Base.connection.quote(ts_config) if ts_config
term = term.gsub("'", "''")
tsquery = "TO_TSQUERY(#{ts_config || default_ts_config}, '''#{PG::Connection.escape_string(term)}'':*#{weight_filter}')"
tsquery = "TO_TSQUERY(#{ts_config || default_ts_config}, '#{term}')"
tsquery = "REPLACE(#{tsquery}::text, '&', '#{PG::Connection.escape_string(joiner)}')::tsquery" if joiner
tsquery
end
def self.set_tsquery_weight_filter(term, weight_filter)
term = term.gsub("'", "''")
"''#{PG::Connection.escape_string(term)}'':*#{weight_filter}"
end
def ts_query(ts_config = nil, weight_filter: nil)
@ts_query_cache ||= {}
@ts_query_cache["#{ts_config || default_ts_config} #{@term} #{weight_filter}"] ||=