patch the query with execute (#191)

src/migrator/migrations/013_imdb_change_ratio_fix.sql

@@ -0,0 +1,19 @@
+-- Remove the old search function
+DROP FUNCTION IF EXISTS search_imdb_meta(TEXT, TEXT, INT, INT);
+
+-- Add the new search function that allows for searching by year with a plus/minus one year range
+CREATE OR REPLACE FUNCTION search_imdb_meta(search_term TEXT, category_param TEXT DEFAULT NULL, year_param INT DEFAULT NULL, limit_param INT DEFAULT 10, similarity_threshold REAL DEFAULT 0.95)
+    RETURNS TABLE(imdb_id character varying(16), title character varying(1000),category character varying(50),year INT, score REAL) AS $$
+BEGIN
+    EXECUTE format('SET pg_trgm.similarity_threshold = %L', similarity_threshold);
+    RETURN QUERY
+        SELECT imdb_metadata.imdb_id, imdb_metadata.title, imdb_metadata.category, imdb_metadata.year, similarity(imdb_metadata.title, search_term) as score
+        FROM imdb_metadata
+        WHERE (imdb_metadata.title % search_term)
+          AND (imdb_metadata.adult = FALSE)
+          AND (category_param IS NULL OR imdb_metadata.category = category_param)
+          AND (year_param IS NULL OR imdb_metadata.year BETWEEN year_param - 1 AND year_param + 1)
+        ORDER BY score DESC
+        LIMIT limit_param;
+END; $$
+    LANGUAGE plpgsql;