DBIx::Class::DeploymentHandler::Cookbook::CustomResultSource(3pm)

Overview

One of the reasons for the absurd level of flexibility that DBIx::Class::DeploymentHandler is so that you can do things that we did not originally anticipate. Surprisingly, I never added a method to change the table for the version storage. That's fine though, the following recipe shows how one can do it in style:

Version Storage

 package MyApp::Schema::DBICDHStorage;
 
 # the following is necessary for some setups
 use MyApp::Schema::DBICDHStorageResult;
 
 use Moose;
 extends 'DBIx::Class::DeploymentHandler::VersionStorage::Standard';
 sub _build_version_rs {
   $_[0]->schema->register_class(
     __VERSION =>
       'MyApp::Schema::DBICDHStorageResult'
   );
   $_[0]->schema->resultset('__VERSION')
 }
 no Moose;
 __PACKAGE__->meta->make_immutable;
 1;

There's not a whole lot special there. The only real bit of code to point out is the "register_class" call. We make sure to point "__VERSION" to the result class that we will define next.

Version Result Class

 package MyApp::Schema::DBICDHStorageResult;
 use parent 'DBIx::Class::DeploymentHandler::VersionStorage::Standard::VersionResult';
 __PACKAGE__->table('fl_bench_journal_versions');
 1;

As you can see, this is almost silly how simple it is, we just change the table being set on the original result.

Our very own DeploymentHandler

 package MyApp::Schema::DeploymentHandler;
 use Moose;
 extends 'DBIx::Class::DeploymentHandler::Dad';
 # a single with would be better, but we can't do that
 # see: http://rt.cpan.org/Public/Bug/Display.html?id=46347
 with 'DBIx::Class::DeploymentHandler::WithApplicatorDumple' => {
     interface_role       => 'DBIx::Class::DeploymentHandler::HandlesDeploy',
     class_name           => 'DBIx::Class::DeploymentHandler::DeployMethod::SQL::Translator',
     delegate_name        => 'deploy_method',
     attributes_to_assume => ['schema'],
     attributes_to_copy   => [qw( databases script_directory sql_translator_args )],
   },
   'DBIx::Class::DeploymentHandler::WithApplicatorDumple' => {
     interface_role       => 'DBIx::Class::DeploymentHandler::HandlesVersioning',
     class_name           => 'DBIx::Class::DeploymentHandler::VersionHandler::Monotonic',
     delegate_name        => 'version_handler',
     attributes_to_assume => [qw( database_version schema_version to_version )],
   },
   'DBIx::Class::DeploymentHandler::WithApplicatorDumple' => {
     interface_role       => 'DBIx::Class::DeploymentHandler::HandlesVersionStorage',
     class_name           => 'MyApp::Schema::DBICDHStorage',
     delegate_name        => 'version_storage',
     attributes_to_assume => ['schema'],
   };
 with 'DBIx::Class::DeploymentHandler::WithReasonableDefaults';
 sub prepare_version_storage_install {
   my $self = shift;
   $self->prepare_resultsource_install({
       result_source => $self->version_storage->version_rs->result_source
   });
 }
 sub install_version_storage {
   my $self = shift;
   my $version = (shift || {})->{version} || $self->schema_version;
   $self->install_resultsource({
       result_source => $self->version_storage->version_rs->result_source,
       version       => $version,
   });
 }
 sub prepare_install {
    $_[0]->prepare_deploy;
    $_[0]->prepare_version_storage_install;
 }
 no Moose;
 __PACKAGE__->meta->make_immutable;
 1;

Note: if you are using decimal numbers for versioning, you should ammend this DeploymentHandler package, setting it's VersionHandler class_name from Monotonic ( which handles integer only version numbers ) to ExplicitVersions or DatabaseToSchemaVersions, as these handle version numbers as strings instead of integers.

Copyright and license

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

Releases

2 releases since Debian 8 (Jessie); the text changed 1 time.

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