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Jifty::DBI::Filter.3pm

NAME

Jifty::DBI::Filter - base class for Jifty::DBI filters

SYNOPSIS

   # To implement your own filter
   package MyApp::Filter::Uppercase;
   use base qw/ Jifty::DBI::Filter /;
 
   # Setup for DB storage, store in lowercase
   sub encode {
       my $self = shift;
 
       my $value_ref = $self->value_ref;
       return unless defined $$value_ref; # don't blow up on undef
 
       $$value_ref = lc $$value_ref;
   }
 
   # Setup for Perl code to use, always sees uppercase
   sub decode {
       my $self = shift;
 
       my $value_ref = $self->value_ref;
       return unless defined $$value_ref; # don't blow up on undef
 
       $$value_ref = uc $$value_ref;
   }
 
   # To use a filter
   use MyApp::Record schema {
       column filtered =>
           type is 'text',
           filters are qw/ MyApp::Filter::Uppercase /;
   };
 
 

DESCRIPTION

A filter allows Jifty::DBI models to tweak data prior to being stored and/or loaded. This is useful for marshalling and unmarshalling complex objects.

METHODS

new

Takes three arguments in a parameter hash:

value_ref

A reference to the current value you're going to be massaging. "encode" works in place, massaging whatever value_ref refers to.

column

A Jifty::DBI::Column object, whatever sort of column we're working with here.

handle

A Jifty::DBI::Handle object, because some filters (ie Jifty::DBI::Filter::Boolean) depend on what database system is being used.

encode

"encode" takes data that users are handing to us and marshals it into a form suitable for sticking it in the database. This could be anything from flattening a DateTime object into an ISO date to making sure that data is utf8 clean.

decode

"decode" takes data that the database is handing back to us and gets it into a form that's OK to hand back to the user. This could be anything from inflating an ISO date to a DateTime object to making sure that the string properly has the utf8 flag.

SEE ALSO

Jifty::DBI::Filter::Date, Jifty::DBI::Filter::DateTime, Jifty::DBI::Filter:SaltHash, Jifty::DBI::Filter::Storable, Jifty::DBI::Filter::Time, Jifty::DBI::Filter::Truncate, Jifty::DBI::Filter::YAML, Jifty::DBI::Filter::base64, Jifty::DBI::Filter::utf8

LICENSE

Jifty::DBI is Copyright 2005-2007 Best Practical Solutions, LLC. Jifty::DBI is distributed under the same terms as Perl itself.