X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FDeploymentHandler%2FDad.pm;h=974884e2e103f9148009d5d95acc62ea6bdfc627;hb=ed45e175a490befb264f8d20f3e5702b6b0b22aa;hp=2c19b3d3afa6391c74321087b99bcf209a99159a;hpb=c4f4d4a2795f30717ae026c4a44b8a36a86ddcfb;p=dbsrgits%2FDBIx-Class-DeploymentHandler.git

diff --git a/lib/DBIx/Class/DeploymentHandler/Dad.pm b/lib/DBIx/Class/DeploymentHandler/Dad.pm
index 2c19b3d..974884e 100644
--- a/lib/DBIx/Class/DeploymentHandler/Dad.pm
+++ b/lib/DBIx/Class/DeploymentHandler/Dad.pm
@@ -1,59 +1,45 @@
 package DBIx::Class::DeploymentHandler::Dad;
 
+# ABSTRACT: Parent class for DeploymentHandlers
+
 use Moose;
 use Method::Signatures::Simple;
-use DBIx::Class::DeploymentHandler::Types;
 require DBIx::Class::Schema;    # loaded for type constraint
-require DBIx::Class::ResultSet; # loaded for type constraint
 use Carp::Clan '^DBIx::Class::DeploymentHandler';
 
 has schema => (
   isa      => 'DBIx::Class::Schema',
   is       => 'ro',
   required => 1,
-  handles => ['schema_version'],
-);
-
-has upgrade_directory => ( # configuration
-  isa      => 'Str',
-  is       => 'ro',
-  required => 1,
-  default  => 'sql',
 );
 
-has backup_directory => ( # configuration
+has backup_directory => (
   isa => 'Str',
   is  => 'ro',
   predicate  => 'has_backup_directory',
 );
 
-has to_version => ( # configuration
+has to_version => (
   is         => 'ro',
   lazy_build => 1,
 );
 
-sub _build_to_version { $_[0]->schema->schema_version }
+sub _build_to_version { $_[0]->schema_version }
 
-has databases => ( # configuration
-  coerce  => 1,
-  isa     => 'DBIx::Class::DeploymentHandler::Databases',
-  is      => 'ro',
-  default => sub { [qw( MySQL SQLite PostgreSQL )] },
+has schema_version => (
+  is         => 'ro',
+  lazy_build => 1,
 );
 
-has sqltargs => ( # configuration
-  isa => 'HashRef',
-  is  => 'ro',
-  default => sub { {} },
-);
+sub _build_schema_version { $_[0]->schema->schema_version }
 
 method install {
   croak 'Install not possible as versions table already exists in database'
     if $self->version_storage_is_installed;
 
-  my $ddl = $self->_deploy;
+  my $ddl = $self->deploy;
 
-  $self->version_storage->add_database_version({
+  $self->add_database_version({
     version     => $self->to_version,
     ddl         => $ddl,
   });
@@ -62,40 +48,169 @@ method install {
 sub upgrade {
   my $self = shift;
   while ( my $version_list = $self->next_version_set ) {
-    $self->_upgrade_single_step($version_list);
+    my ($ddl, $upgrade_sql) = @{$self->upgrade_single_step($version_list)||[]};
 
     $self->add_database_version({
       version     => $version_list->[-1],
-      # ddl         => $ddl,
-      # upgrade_sql => $upgrade_sql,
+      ddl         => $ddl,
+      upgrade_sql => $upgrade_sql,
     });
   }
 }
 
+sub downgrade {
+  my $self = shift;
+  while ( my $version_list = $self->previous_version_set ) {
+    $self->downgrade_single_step($version_list);
+
+    # do we just delete a row here?  I think so but not sure
+    $self->delete_database_version({ version => $version_list->[-1] });
+  }
+}
+
 method backup { $self->storage->backup($self->backup_directory) }
 
 __PACKAGE__->meta->make_immutable;
 
 1;
 
+# vim: ts=2 sw=2 expandtab
+
+__END__
+
 =pod
 
 =attr schema
 
-=attr upgrade_directory
+The L<DBIx::Class::Schema> (B<required>) that is used to talk to the database
+and generate the DDL.
+
+=attr schema_version
+
+The version that the schema is currently at.  Defaults to
+C<< $self->schema->schema_version >>.
 
 =attr backup_directory
 
+The directory where backups are stored
+
 =attr to_version
 
-=attr databases
+The version (defaults to schema's version) to migrate the database to
 
 =method install
 
+ $dh->install
+
+Deploys the current schema into the database.  Populates C<version_storage> with
+C<version> and C<ddl>.
+
+B<Note>: you typically need to call C<< $dh->prepare_deploy >> before you call
+this method.
+
+B<Note>: you cannot install on top of an already installed database
+
 =method upgrade
 
+ $dh->upgrade
+
+Upgrades the database one step at a time till L</next_version_set>
+returns C<undef>.  Each upgrade step will add a C<version>, C<ddl>, and
+C<upgrade_sql> to the version storage (if C<ddl> and/or C<upgrade_sql> are
+returned from L</upgrade_single_step>.
+
+=method downgrade
+
+ $dh->downgrade
+
+Downgrades the database one step at a time till L</previous_version_set>
+returns C<undef>.  Each downgrade step will delete a C<version> from the
+version storage.
+
 =method backup
 
-__END__
+ $dh->backup
+
+Simply calls backup on the C<< $schema->storage >>, passing in
+C<< $self->backup_directory >> as an argument.  Please test yourself before
+assuming it will work.
+
+=head1 METHODS THAT ARE REQUIRED IN SUBCLASSES
+
+=head2 deploy
+
+See L<DBIx::Class::DeploymentHandler::HandlesDeploy/deploy>.
+
+=head2 version_storage_is_installed
+
+See L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/version_storage_is_installed>.
+
+=head2 add_database_version
+
+See L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/add_database_version>.
+
+=head2 delete_database_version
+
+See L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/delete_database_version>.
+
+=head2 next_version_set
+
+See L<DBIx::Class::DeploymentHandler::HandlesVersioning/next_version_set>.
+
+=head2 previous_version_set
+
+See L<DBIx::Class::DeploymentHandler::HandlesVersioning/previous_version_set>.
+
+=head2 upgrade_single_step
+
+See L<DBIx::Class::DeploymentHandler::HandlesDeploy/upgrade_single_step>.
+
+=head2 downgrade_single_step
+
+See L<DBIx::Class::DeploymentHandler::HandlesDeploy/downgrade_single_step>.
+
+=head1 ORTHODOX METHODS
+
+These methods are not actually B<required> as things will probably still work
+if you don't implement them, but if you want your subclass to get along with
+other subclasses (or more likely, tools made to use another subclass), you
+should probably implement these too, even if they are no-ops.
+
+=head2 database_version
+
+see L<DBIx::Class::DeploymentHandler::HandlesVersionStorage/database_version>
+
+=head2 prepare_deploy
+
+see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_deploy>
+
+=head2 prepare_resultsource_install
+
+see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_resultsource_install>
+
+=head2 install_resultsource
+
+see L<DBIx::Class::DeploymentHandler::HandlesDeploy/install_resultsource>
+
+=head2 prepare_upgrade
+
+see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_upgrade>
+
+=head2 prepare_downgrade
+
+see L<DBIx::Class::DeploymentHandler::HandlesDeploy/prepare_downgrade>
+
+=head2 SUBCLASSING
+
+All of the methods mentioned in L</METHODS THAT ARE REQUIRED IN SUBCLASSES> and
+L</ORTHODOX METHODS> can be implemented in any fashion you choose.  In the
+spirit of code reuse I have used roles to implement them in my two subclasses,
+L<DBIx::Class::DeploymentHandler> and
+L<DBIx::Class::DeploymentHandler::Deprecated>, but you are free to implement
+them entirely in a subclass if you so choose to.
+
+For in-depth documentation on how methods are supposed to work, see the roles
+L<DBIx::Class::DeploymentHandler::HandlesDeploy>,
+L<DBIx::Class::DeploymentHandler::HandlesVersioning>, and
+L<DBIx::Class::DeploymentHandler::HandlesVersionStorage>.
 
-vim: ts=2 sw=2 expandtab