The symbol_as extension adds Symbol#as, for creating Sequel::SQL::AliasedExpression objects. It’s designed as a shortcut so that instead of:
Sequel[:column].as(:alias)
you can just write:
:column.as(:alias)
To load the extension:
Sequel.extension :symbol_as
If you are using Ruby 2+, and you would like to use refinements, there is a refinement version of this in the symbol_as_refinement extension.