+
+// ---------------------------------------------------------------------------
+
+async function checkPostgresExtensions () {
+ const promises = [
+ checkPostgresExtension('pg_trgm'),
+ checkPostgresExtension('unaccent')
+ ]
+
+ return Promise.all(promises)
+}
+
+async function checkPostgresExtension (extension: string) {
+ const query = `SELECT 1 FROM pg_available_extensions WHERE name = '${extension}' AND installed_version IS NOT NULL;`
+ const options = {
+ type: QueryTypes.SELECT as QueryTypes.SELECT,
+ raw: true
+ }
+
+ const res = await sequelizeTypescript.query<object>(query, options)
+
+ if (!res || res.length === 0) {
+ // Try to create the extension ourselves
+ try {
+ await sequelizeTypescript.query(`CREATE EXTENSION ${extension};`, { raw: true })
+
+ } catch {
+ const errorMessage = `You need to enable ${extension} extension in PostgreSQL. ` +
+ `You can do so by running 'CREATE EXTENSION ${extension};' as a PostgreSQL super user in ${CONFIG.DATABASE.DBNAME} database.`
+ throw new Error(errorMessage)
+ }
+ }
+}
+
+function createFunctions () {
+ const query = `CREATE OR REPLACE FUNCTION immutable_unaccent(text)
+ RETURNS text AS
+$func$
+SELECT public.unaccent('public.unaccent', $1::text)
+$func$ LANGUAGE sql IMMUTABLE;`
+
+ return sequelizeTypescript.query(query, { raw: true })
+}