NAME

       Class::DBI::ColumnGrouper - Columns and Column Groups

SYNOPSIS

               my $colg = Class::DBI::ColumnGrouper->new;
                  $colg->add_group(People => qw/star director producer/);

               my @cols = $colg->group_cols($group);

               my @all            = $colg->all_columns;
               my @pri_col        = $colg->primary;
               my @essential_cols = $colg->essential;

DESCRIPTION

       Each Class::DBI class maintains a list of its columns as class data.  This provides an
       interface to that. You probably don't want to be dealing with this directly.

METHODS

   new
               my $colg = Class::DBI::ColumnGrouper->new;

       A new blank ColumnnGrouper object.

   clone
               my $colg2 = $colg->clone;

       Clone an existing ColumnGrouper.

   add_column / find_column
               $colg->add_column($name);
               my Class::DBI::Column $col = $colg->find_column($name);

       Add or return a Column object for the given column name.

   add_group
               $colg->add_group(People => qw/star director producer/);

       This adds a list of columns as a column group.

   group_cols / groups_for
               my @colg = $cols->group_cols($group);
               my @groups = $cols->groups_for(@cols);

       This returns a list of all columns which are in the given group, or the groups a given
       column is in.

   columns_in
               my @cols = $colg->columns_in(@groups);

       This returns a list of all columns which are in the given groups.

   all_columns
               my @all = $colg->all_columns;

       This returns a list of all the real columns.

   primary
               my $pri_col = $colg->primary;

       This returns a list of the columns in the Primary group.

   essential
               my @essential_cols = $colg->essential;

       This returns a list of the columns in the Essential group.