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

       Florian Ragwitz <rafl@debian.org>

       Automatically set and update fields with values calculated at runtime.

       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.

perl v5.34.0                                       2022-06-13                   DBIx::Class::DynamicDefault(3pm)

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

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.

         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.