NAME

       DBIx::Class::DynamicDefault - Automatically set and update fields

SYNOPSIS

         package My::Schema::SomeTable;

         __PACKAGE__->load_components(qw/DynamicDefault ... Core/);

         __PACKAGE__->add_columns(
                 quux          => { data_type => 'integer' },
                 quux_plus_one => { data_type => 'integer',
                                    dynamic_default_on_create => \&quux_plus_one_default,
                                    dynamic_default_on_update => 'quux_plus_one_default', },
                 last_changed  => { data_type => 'integer',
                                    dynamic_default_on_create => 'now',
                                    dynamic_default_on_update => 'now, },
         );

         sub quux_plus_one_default {
             my ($self) = @_;
             return $self->quux + 1;
         }

         sub now {
             return DateTime->now->epoch;
         }

       Now, any update or create actions will set the specified columns to the value returned by
       the callback you specified as a method name or code reference.

DESCRIPTION

       Automatically set and update fields with values calculated at runtime.

OPTIONS

   dynamic_default_on_create
         dynamic_default_on_create => sub { ... }

         dynamic_default_on_create => 'method_name'

       When inserting a new row all columns with the "dynamic_default_on_create" option will be
       set to the return value of the specified callback unless the columns value has been
       explicitly set. The callback, that'll be invoked with the row object as its only argument,
       may be a code reference or a method name.

   dynamic_default_on_update
         dynamic_default_on_update => sub { ... }

         dynamic_default_on_update => 'method_name'

       When updating a row all columns with the "dynamic_default_on_update" option will be set to
       the return value of the specified callback unless the columns value has been explicitly
       set.

       Columns will only be altered if other dirty columns exist. See "always_update" on how to
       change this.

   always_update
         always_update => 1

       When setting "always_update" to 1 "dynamic_default_on_update" callbacks will always be
       invoked, even if no other columns are dirty.

AUTHOR

       Florian Ragwitz <rafl@debian.org>

LICENSE

       This software is copyright (c) 2008 by Florian Ragwitz.

       This is free software; you can redistribute it and/or modify it under the same terms as
       perl itself.