Rose::DB::Object::Metadata::UniqueKey - Unique key metadata.

       John C. Siracusa (siracusa@gmail.com)

       Objects of this class store and manipulate metadata for unique keys in a database table.  Each unique key
       is made up of one or more columns.

       Copyright  (c)  2010  by  John C. Siracusa.  All rights reserved.  This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl itself.

perl v5.36.0                                       2022-10-14              Rose::DB::Obje...data::UniqueKey(3pm)

       Rose::DB::Object::Metadata::UniqueKey - Unique key metadata.

add_column[COLUMNS]
           This method is an alias for the add_columns method.

       add_columns[COLUMNS]
           Add  COLUMNS to the list of columns that make up the unique key.  COLUMNS must be a list or reference
           to an array of  column names or Rose::DB::Object::Metadata::Column-derived objects.

       columns[COLUMNS]
           Get or set the list of columns that make up the unique key.  COLUMNS must a list or reference  to  an
           array of column names or Rose::DB::Object::Metadata::Column-derived objects.

           This  method  returns  all  of  the  columns  that  make  up  the  unique  key.   Each  column  is  a
           Rose::DB::Object::Metadata::Column-derived column object if the unique  key's  parent  has  a  column
           object  with  the same name, or just the column name otherwise.  In scalar context, a reference to an
           array of columns is returned.  In list context, a list is returned.

       column_names
           Returns a list (in list context) or reference to an array (in scalar context) of  the  names  of  the
           columns that make up the unique key.

       delete_columns
           Delete the entire list of columns that make up the unique key.

       name[NAME]
           Get  or set the name of the unique key.  This name should be unique among all unique keys for a given
           table.  Traditionally, it is the name of the index that the database uses to maintain the unique key,
           but practices vary.  If left undefined, the  default  value  is  a  string  created  by  joining  the
           column_names with underscores.

       parent[META]
           Get or set the Rose::DB::Object::Metadata-derived object that this unique key belongs to.

         use Rose::DB::Object::Metadata::UniqueKey;

         $uk = Rose::DB::Object::Metadata::UniqueKey->new(
                 columns => [ 'name', 'color' ]);

         MyClass->meta->add_unique_key($uk);
         ...