instance method gem_for_database

# File railties/lib/rails/generators/rails/app/app_generator.rb, line 399
      def gem_for_database
        # %w( mysql oracle postgresql sqlite3 frontbase ibm_db jdbcmysql jdbcsqlite3 jdbcpostgresql)
        case options[:database]
        when "oracle"     then "ruby-oci8"
        when "postgresql" then "pg"
        when "sqlite3"    then "sqlite3"
        when "frontbase"  then "ruby-frontbase"
        when "mysql"      then "mysql2"
        when "jdbcmysql"  then "activerecord-jdbcmysql-adapter"
        when "jdbcsqlite3"  then "activerecord-jdbcsqlite3-adapter"
        when "jdbcpostgresql"  then "activerecord-jdbcpostgresql-adapter"
        when "jdbc"           then "activerecord-jdbc-adapter"
        else options[:database]
        end
      end