1Class::DBI::Cascade::NoUnsee(r3)Contributed Perl DocumenCtlaatsiso:n:DBI::Cascade::None(3)
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NAME

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

9       This is a Cascading Delete strategy that will do nothing, leaving
10       orphaned records behind.
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12       It is the base class for most ofther Cascade strategies, and so
13       provides several important methods:
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CONSTRUCTOR

16   new
17               my $strategy = Cascade::Class->new($Relationship);
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19       This must be instantiated with a Class::DBI::Relationship object.
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METHODS

22   foreign_for
23               my $iterator = $strategy->foreign_for($obj);
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25       This will return all the objects which are foreign to $obj across the
26       relationship. It's a normal Class::DBI search you can get the results
27       either as a list or as an iterator.
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29   cascade
30               $strategy->cascade($obj);
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32       Cascade across the related objects to $obj.
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WRITING NEW STRATEGIES

35       Creating a Cascade strategy should be fairly simple. You usually just
36       need to inherit from here, and then supply a cascade() method that does
37       the required thing with the results from foreign_for().
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39       So, for example, Cascade::Delete is implemented simply as:
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41               package Class::DBI::Cascade::Delete;
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43               use base 'Class::DBI::Cascade::None';
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45               sub cascade {
46                       my ($self, $obj) = @_;
47                       $self->foreign_for($obj)->delete_all;
48               }
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52perl v5.32.1                      2021-01-27      Class::DBI::Cascade::None(3)
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