DBIx::Class::InflateColumn5.12 man page on Darwin

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DBIx::Class::InflateCoUser(Contributed Perl DocumDBIx::Class::InflateColumn(3)

NAME
       DBIx::Class::InflateColumn - Automatically create references from
       column data

SYNOPSIS
	   # In your table classes
	   __PACKAGE__->inflate_column('column_name', {
	       inflate => sub { ... },
	       deflate => sub { ... },
	   });

DESCRIPTION
       This component translates column data into references, i.e. "inflating"
       the column data. It also "deflates" references into an appropriate
       format for the database.

       It can be used, for example, to automatically convert to and from
       DateTime objects for your date and time fields. There's a convenience
       component to actually do that though, try
       DBIx::Class::InflateColumn::DateTime.

       It will handle all types of references except scalar references. It
       will not handle scalar values, these are ignored and thus passed
       through to SQL::Abstract. This is to allow setting raw values to "just
       work". Scalar references are passed through to the database to deal
       with, to allow such settings as " \'year + 1'" and " \'DEFAULT' " to
       work.

       If you want to filter plain scalar values and replace them with
       something else, see DBIx::Class::FilterColumn.

METHODS
   inflate_column
       Instruct DBIx::Class to inflate the given column.

       In addition to the column name, you must provide "inflate" and
       "deflate" methods. The "inflate" method is called when you access the
       field, while the "deflate" method is called when the field needs to
       used by the database.

       For example, if you have a table "events" with a timestamp field named
       "insert_time", you could inflate the column in the corresponding table
       class using something like:

	   __PACKAGE__->inflate_column('insert_time', {
	       inflate => sub { DateTime::Format::Pg->parse_datetime(shift); },
	       deflate => sub { DateTime::Format::Pg->format_datetime(shift); },
	   });

       (Replace DateTime::Format::Pg with the appropriate module for your
       database, or consider DateTime::Format::DBI.)

       The coderefs you set for inflate and deflate are called with two
       parameters, the first is the value of the column to be
       inflated/deflated, the second is the row object itself. Thus you can
       call "->result_source->schema->storage->dbh" in your inflate/defalte
       subs, to feed to DateTime::Format::DBI.

       In this example, calls to an event's "insert_time" accessor return a
       DateTime object. This DateTime object is later "deflated" when used in
       the database layer.

   get_inflated_column
	 my $val = $obj->get_inflated_column($col);

       Fetch a column value in its inflated state.  This is directly analogous
       to "get_column" in DBIx::Class::Row in that it only fetches a column
       already retrieved from the database, and then inflates it.  Throws an
       exception if the column requested is not an inflated column.

   set_inflated_column
	 my $copy = $obj->set_inflated_column($col => $val);

       Sets a column value from an inflated value.  This is directly analogous
       to "set_column" in DBIx::Class::Row.

   store_inflated_column
	 my $copy = $obj->store_inflated_column($col => $val);

       Sets a column value from an inflated value without marking the column
       as dirty. This is directly analogous to "store_column" in
       DBIx::Class::Row.

SEE ALSO
       DBIx::Class::Core - This component is loaded as part of the "core"
       DBIx::Class components; generally there is no need to load it directly

AUTHOR
       Matt S. Trout <mst@shadowcatsystems.co.uk>

CONTRIBUTORS
       Daniel Westermann-Clark <danieltwc@cpan.org> (documentation)

       Jess Robinson <cpan@desert-island.demon.co.uk>

LICENSE
       You may distribute this code under the same terms as Perl itself.

perl v5.12.5			  2011-05-10	 DBIx::Class::InflateColumn(3)
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