NAME

       Catmandu::Fix::retain - delete everything except the paths given

SYNOPSIS

          # Keep the field _id , name , title
          retain(_id , name, title)

          # Delete everything except foo.bar
          #   {bar => { x => 1} , foo => {bar => 1, y => 2}}
          # to
          #   {foo => {bar => 1}}
          retain(foo.bar)

SEE ALSO

       Catmandu::Fix