I have the folowing table structure:

Schema "public": with one table called "users"
Schema "forums": with one table called "users"

methods like PostgreSqlPlatform::getListTableForeignKeysSQL($table, $database = '') should list FK inside $table

the default search path is "public,pg_catalog"

calling PostgreSqlPlatform::getListTableForeignKeysSQL('users') it shuld extract the FK from public.users table, but this is the current result:

[PDOException] SQLSTATE[21000]: Cardinality violation: 7 ERROR: more than one row returned by a subquery used as an expression

this exception is thrown because PostgreSqlPlatform::getTableWhereClause do not cosider the current search path.

i propose the following implementation for PostgreSqlPlatform::getTableWhereClause

 
    private function getTableWhereClause($table, $classAlias = 'c', $namespaceAlias = 'n')
    {
        $whereClause = $namespaceAlias.".nspname NOT IN ('pg_catalog', 'information_schema', 'pg_toast') AND ";
        if (strpos($table, ".") !== false) {
            list($schema, $table) = explode(".", $table);
            $whereClause .= "$classAlias.relname = '" . $table . "' AND $namespaceAlias.nspname = '" . $schema . "'";
        } else {
            // $whereClause .= "$classAlias.relname = '" . $table . "'"; // this was the current implementation
            $whereClause .= "$classAlias.relname = '" . $table . "' AND $namespaceAlias.nspname = ANY(string_to_array((select setting from pg_catalog.pg_settings where name = 'search_path'),','))";
        }

        return $whereClause;
    }

this implementation will restrict the search range only to current "search_path".

(sorry for my english)