+++ /dev/null
-NAME
- DBIx::Class::ResultSet::RecursiveUpdate - like update_or_create - but
- recursive
-
-SYNOPSIS
- The functional interface:
-
- my $new_item = DBIx::Class::ResultSet::RecursiveUpdate::Functions::recursive_update({
- resultset => $schema->resultset( 'Dvd' ),
- updates => {
- id => 1,
- owned_dvds => [
- {
- title => 'One Flew Over the Cuckoo's Nest'
- }
- ]
- }
- });
-
- As ResultSet subclass:
-
- __PACKAGE__->load_namespaces( default_resultset_class => '+DBIx::Class::ResultSet::RecursiveUpdate' );
-
- in the Schema file (see t/lib/DBSchema.pm). Or appriopriate 'use base'
- in the ResultSet classes.
-
- Then:
-
- my $user = $user_rs->recursive_update( {
- id => 1,
- owned_dvds => [
- {
- title => 'One Flew Over the Cuckoo's Nest'
- }
- ]
- }
- );
-
-DESCRIPTION
-This is still experimental. I've added a functional interface so that it can be used
-in Form Processors and not require modification of the model.
- You can feed the ->create method with a recursive datastructure and have
- the related records created. Unfortunately you cannot do a similar thing
- with update_or_create - this module tries to fill that void.
-
- It is a base class for ResultSets providing just one method:
- recursive_update which works just like update_or_create but can
- recursively update or create data objects composed of multiple rows. All
- rows need to be identified by primary keys - so you need to provide them
- in the update structure (unless they can be deduced from the parent row
- - for example when you have a belongs_to relationship). If not all
- colums comprising the primary key are specified - then a new row will be
- created, with the expectation that the missing columns will be filled by
- it (as in the case of auto_increment primary keys).
-
- If the resultset itself stores an assignement for the primary key, like
- in the case of:
-
- my $restricted_rs = $user_rs->search( { id => 1 } );
-
- then you need to inform recursive_update about additional predicate with
- a second argument:
-
- my $user = $restricted_rs->recursive_update( {
- owned_dvds => [
- {
- title => 'One Flew Over the Cuckoo's Nest'
- }
- ]
- },
- [ 'id' ]
- );
-
- This will work with a new DBIC release.
-
- For a many_to_many (pseudo) relation you can supply a list of primary
- keys from the other table - and it will link the record at hand to those
- and only those records identified by them. This is convenient for
- handling web forms with check boxes (or a SELECT box with multiple
- choice) that let you update such (pseudo) relations.
-
- For a description how to set up base classes for ResultSets see
- load_namespaces in DBIx::Class::Schema.
-
-DESIGN CHOICES
- Treatment of many to many pseudo relations
- The function gets the information about m2m relations from
- DBIx::Class::IntrospectableM2M. If it is not loaded in the ResultSource
- classes - then the code relies on the fact that: if($object->can($name)
- and !$object->result_source->has_relationship($name) and $object->can(
- 'set_' . $name ) )
-
- then $name must be a many to many pseudo relation. And that in a
- similarly ugly was I find out what is the ResultSource of objects from
- that many to many pseudo relation.
-
-INTERFACE
-METHODS
- recursive_update
- The method that does the work here.
-
- is_m2m
- $self->is_m2m( 'name ' ) - answers the question if 'name' is a many to
- many (pseudo) relation on $self.
-
- get_m2m_source
- $self->get_m2m_source( 'name' ) - returns the ResultSource linked to by
- the many to many (pseudo) relation 'name' from $self.
-
-DIAGNOSTICS
-CONFIGURATION AND ENVIRONMENT
- DBIx::Class::RecursiveUpdate requires no configuration files or
- environment variables.
-
-DEPENDENCIES
- DBIx::Class
-
-INCOMPATIBILITIES
- None reported.
-
-BUGS AND LIMITATIONS
- No bugs have been reported.
-
- Please report any bugs or feature requests to
- "bug-dbix-class-recursiveput@rt.cpan.org", or through the web interface
- at <http://rt.cpan.org>.
-
-AUTHOR
- Zbigniew Lukasiak "<zby@cpan.org>" Influenced by code by Pedro Melo.
-
-LICENCE AND COPYRIGHT
- Copyright (c) 2008, Zbigniew Lukasiak "<zby@cpan.org>". All rights
- reserved.
-
- This module is free software; you can redistribute it and/or modify it
- under the same terms as Perl itself. See perlartistic.
-
-DISCLAIMER OF WARRANTY
- BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
- FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
- OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
- PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
- EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
- ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
- YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
- NECESSARY SERVICING, REPAIR, OR CORRECTION.
-
- IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
- WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
- REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE
- TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR
- CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
- SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
- RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
- FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
- SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
- DAMAGES.
-
projects / chaz / p5-DBIx-Class-ResultSet-RecursiveUpdate / blobdiff