The sql_expr extension adds the sql_expr method to every object, which returns an wrapped object that works nicely with Sequel’s DSL by calling Sequel.expr:
1.sql_expr < :a # 1 < a false.sql_expr & :a # FALSE AND a true.sql_expr | :a # TRUE OR a ~nil.sql_expr # NOT NULL "a".sql_expr + "b" # 'a' || 'b'
To load the extension:
Sequel.extension :sql_expr