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Manual Reference Pages  -  CLASS::DBI::CASCADE::NONE (3)

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NAME

Class::DBI::Cascade::None - Do nothing upon deletion

CONTENTS

DESCRIPTION

This is a Cascading Delete strategy that will do nothing, leaving orphaned records behind.

It is the base class for most ofther Cascade strategies, and so provides several important methods:

CONSTRUCTOR

    new



        my $strategy = Cascade::Class->new($Relationship);



This must be instantiated with a Class::DBI::Relationship object.

METHODS

    foreign_for



        my $iterator = $strategy->foreign_for($obj);



This will return all the objects which are foreign to $obj across the relationship. It’s a normal Class::DBI search you can get the results either as a list or as an iterator.

    cascade



        $strategy->cascade($obj);



Cascade across the related objects to $obj.

WRITING NEW STRATEGIES

Creating a Cascade strategy should be fairly simple. You usually just need to inherit from here, and then supply a cascade() method that does the required thing with the results from foreign_for().

So, for example, Cascade::Delete is implemented simply as:



        package Class::DBI::Cascade::Delete;

        use base Class::DBI::Cascade::None;

        sub cascade {
                my ($self, $obj) = @_;
                $self->foreign_for($obj)->delete_all;
        }



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perl v5.20.3 CLASS::DBI::CASCADE::NONE (3) 2005-09-14

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