From: Jess Robinson Date: Sat, 11 Oct 2008 17:07:00 +0000 (+0000) Subject: Modernised and rearranged docs massively into a saner order. X-Git-Tag: v0.08240~324 X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=829517d4c466a52cac6123bb6e56af32c76f9646;p=dbsrgits%2FDBIx-Class.git Modernised and rearranged docs massively into a saner order. --- diff --git a/lib/DBIx/Class/Schema.pm b/lib/DBIx/Class/Schema.pm index 618cc87..d72e3d4 100644 --- a/lib/DBIx/Class/Schema.pm +++ b/lib/DBIx/Class/Schema.pm @@ -29,12 +29,12 @@ DBIx::Class::Schema - composable schemas package Library::Schema; use base qw/DBIx::Class::Schema/; - # load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD - __PACKAGE__->load_classes(qw/CD Book DVD/); + # load all Result classes in Library/Schema/Result/ + __PACKAGE__->load_namespaces(); - package Library::Schema::CD; + package Library::Schema::Result::CD; use base qw/DBIx::Class/; - __PACKAGE__->load_components(qw/PK::Auto Core/); # for example + __PACKAGE__->load_components(qw/Core/); # for example __PACKAGE__->table('cd'); # Elsewhere in your code: @@ -47,7 +47,7 @@ DBIx::Class::Schema - composable schemas my $schema2 = Library::Schema->connect($coderef_returning_dbh); - # fetch objects using Library::Schema::DVD + # fetch objects using Library::Schema::Result::DVD my $resultset = $schema1->resultset('DVD')->search( ... ); my @dvd_objects = $schema2->resultset('DVD')->search( ... ); @@ -61,193 +61,184 @@ NB: If you're used to L it's worth reading the L carefully, as DBIx::Class does things a little differently. Note in particular which module inherits off which. -=head1 METHODS +=head1 SETUP METHODS -=head2 register_class +=head2 load_namespaces =over 4 -=item Arguments: $moniker, $component_class +=item Arguments: %options? =back -Registers a class which isa DBIx::Class::ResultSourceProxy. Equivalent to -calling: + __PACKAGE__->load_namespaces(); - $schema->register_source($moniker, $component_class->result_source_instance); + __PACKAGE__->load_namespaces( + result_namespace => 'Res', + resultset_namespace => 'RSet', + default_resultset_class => '+MyDB::Othernamespace::RSet', + ); -=cut +With no arguments, this method uses L to load all your +Result classes from a sub-namespace F under your Schema class' +namespace. Eg. With a Schema of I all files in +I are assumed to be Result classes. -sub register_class { - my ($self, $moniker, $to_register) = @_; - $self->register_source($moniker => $to_register->result_source_instance); -} +It also finds all ResultSet classes in the namespace F and +loads them into the appropriate Result classes using for you. The +matching is done by assuming the package name of the ResultSet class +is the same as that of the Result class. -=head2 register_source +You will be warned if ResulSet classes are discovered for which there +are no matching Result classes like this: -=over 4 + load_namespaces found ResultSet class $classname with no corresponding Result class -=item Arguments: $moniker, $result_source +If a Result class is found to already have a ResultSet class set using +L to some other class, you will be warned like this: -=back + We found ResultSet class '$rs_class' for '$result', but it seems + that you had already set '$result' to use '$rs_set' instead -Registers the L in the schema with the given -moniker. +Both of the sub-namespaces are configurable if you don't like the defaults, +via the options C and C. -=cut +If (and only if) you specify the option C, any found +Result classes for which we do not find a corresponding +ResultSet class will have their C set to +C. -sub register_source { - my $self = shift; +All of the namespace and classname options to this method are relative to +the schema classname by default. To specify a fully-qualified name, prefix +it with a literal C<+>. - $self->_register_source(@_); -} +Examples: -=head2 register_extra_source + # load My::Schema::Result::CD, My::Schema::Result::Artist, + # My::Schema::ResultSet::CD, etc... + My::Schema->load_namespaces; -=over 4 + # Override everything to use ugly names. + # In this example, if there is a My::Schema::Res::Foo, but no matching + # My::Schema::RSets::Foo, then Foo will have its + # resultset_class set to My::Schema::RSetBase + My::Schema->load_namespaces( + result_namespace => 'Res', + resultset_namespace => 'RSets', + default_resultset_class => 'RSetBase', + ); -=item Arguments: $moniker, $result_source + # Put things in other namespaces + My::Schema->load_namespaces( + result_namespace => '+Some::Place::Results', + resultset_namespace => '+Another::Place::RSets', + ); -=back +If you'd like to use multiple namespaces of each type, simply use an arrayref +of namespaces for that option. In the case that the same result +(or resultset) class exists in multiple namespaces, the latter entries in +your list of namespaces will override earlier ones. -As L but should be used if the result class already -has a source and you want to register an extra one. + My::Schema->load_namespaces( + # My::Schema::Results_C::Foo takes precedence over My::Schema::Results_B::Foo : + result_namespace => [ 'Results_A', 'Results_B', 'Results_C' ], + resultset_namespace => [ '+Some::Place::RSets', 'RSets' ], + ); =cut -sub register_extra_source { - my $self = shift; - - $self->_register_source(@_, { extra => 1 }); +# Pre-pends our classname to the given relative classname or +# class namespace, unless there is a '+' prefix, which will +# be stripped. +sub _expand_relative_name { + my ($class, $name) = @_; + return if !$name; + $name = $class . '::' . $name if ! ($name =~ s/^\+//); + return $name; } -sub _register_source { - my ($self, $moniker, $source, $params) = @_; - - %$source = %{ $source->new( { %$source, source_name => $moniker }) }; - - my %reg = %{$self->source_registrations}; - $reg{$moniker} = $source; - $self->source_registrations(\%reg); - - $source->schema($self); - weaken($source->{schema}) if ref($self); - return if ($params->{extra}); +# returns a hash of $shortname => $fullname for every package +# found in the given namespaces ($shortname is with the $fullname's +# namespace stripped off) +sub _map_namespaces { + my ($class, @namespaces) = @_; - if ($source->result_class) { - my %map = %{$self->class_mappings}; - if (exists $map{$source->result_class}) { - warn $source->result_class . ' already has a source, use register_extra_source for additional sources'; - } - $map{$source->result_class} = $moniker; - $self->class_mappings(\%map); + my @results_hash; + foreach my $namespace (@namespaces) { + push( + @results_hash, + map { (substr($_, length "${namespace}::"), $_) } + Module::Find::findallmod($namespace) + ); } -} - -sub _unregister_source { - my ($self, $moniker) = @_; - my %reg = %{$self->source_registrations}; - - my $source = delete $reg{$moniker}; - $self->source_registrations(\%reg); - if ($source->result_class) { - my %map = %{$self->class_mappings}; - delete $map{$source->result_class}; - $self->class_mappings(\%map); - } -} - -=head2 class - -=over 4 - -=item Arguments: $moniker -=item Return Value: $classname - -=back - -Retrieves the result class name for the given moniker. For example: - - my $class = $schema->class('CD'); - -=cut - -sub class { - my ($self, $moniker) = @_; - return $self->source($moniker)->result_class; -} - -=head2 source - -=over 4 - -=item Arguments: $moniker - -=item Return Value: $result_source - -=back - - my $source = $schema->source('Book'); - -Returns the L object for the registered moniker. - -=cut - -sub source { - my ($self, $moniker) = @_; - my $sreg = $self->source_registrations; - return $sreg->{$moniker} if exists $sreg->{$moniker}; - - # if we got here, they probably passed a full class name - my $mapped = $self->class_mappings->{$moniker}; - $self->throw_exception("Can't find source for ${moniker}") - unless $mapped && exists $sreg->{$mapped}; - return $sreg->{$mapped}; + @results_hash; } -=head2 sources - -=over 4 - -=item Return Value: @source_monikers - -=back - -Returns the source monikers of all source registrations on this schema. -For example: - - my @source_monikers = $schema->sources; +sub load_namespaces { + my ($class, %args) = @_; -=cut + my $result_namespace = delete $args{result_namespace} || 'Result'; + my $resultset_namespace = delete $args{resultset_namespace} || 'ResultSet'; + my $default_resultset_class = delete $args{default_resultset_class}; -sub sources { return keys %{shift->source_registrations}; } + $class->throw_exception('load_namespaces: unknown option(s): ' + . join(q{,}, map { qq{'$_'} } keys %args)) + if scalar keys %args; -=head2 storage + $default_resultset_class + = $class->_expand_relative_name($default_resultset_class); - my $storage = $schema->storage; + for my $arg ($result_namespace, $resultset_namespace) { + $arg = [ $arg ] if !ref($arg) && $arg; -Returns the L object for this Schema. + $class->throw_exception('load_namespaces: namespace arguments must be ' + . 'a simple string or an arrayref') + if ref($arg) ne 'ARRAY'; -=head2 resultset + $_ = $class->_expand_relative_name($_) for (@$arg); + } -=over 4 + my %results = $class->_map_namespaces(@$result_namespace); + my %resultsets = $class->_map_namespaces(@$resultset_namespace); -=item Arguments: $moniker + my @to_register; + { + no warnings 'redefine'; + local *Class::C3::reinitialize = sub { }; + use warnings 'redefine'; -=item Return Value: $result_set + foreach my $result (keys %results) { + my $result_class = $results{$result}; + $class->ensure_class_loaded($result_class); + $result_class->source_name($result) unless $result_class->source_name; -=back + my $rs_class = delete $resultsets{$result}; + my $rs_set = $result_class->resultset_class; + if($rs_set && $rs_set ne 'DBIx::Class::ResultSet') { + if($rs_class && $rs_class ne $rs_set) { + warn "We found ResultSet class '$rs_class' for '$result', but it seems " + . "that you had already set '$result' to use '$rs_set' instead"; + } + } + elsif($rs_class ||= $default_resultset_class) { + $class->ensure_class_loaded($rs_class); + $result_class->resultset_class($rs_class); + } - my $rs = $schema->resultset('DVD'); + push(@to_register, [ $result_class->source_name, $result_class ]); + } + } -Returns the L object for the registered moniker. + foreach (sort keys %resultsets) { + warn "load_namespaces found ResultSet class $_ with no " + . 'corresponding Result class'; + } -=cut + Class::C3->reinitialize; + $class->register_class(@$_) for (@to_register); -sub resultset { - my ($self, $moniker) = @_; - return $self->source($moniker)->resultset; + return; } =head2 load_classes @@ -258,6 +249,9 @@ sub resultset { =back +Alternative method to L which you should look at +using if you can. + With no arguments, this method uses L to find all classes under the schema's namespace. Otherwise, this method loads the classes you specify (using L), and registers them (using L). @@ -266,6 +260,13 @@ It is possible to comment out classes with a leading C<#>, but note that perl will think it's a mistake (trying to use a comment in a qw list), so you'll need to add C before your load_classes call. +If any classes found do not appear to be Result class files, you will +get the following warning: + + Failed to load $comp_class. Can't find source_name method. Is + $comp_class really a full DBIC result class? Fix it, move it elsewhere, + or make your load_classes call more specific. + Example: My::Schema->load_classes(); # loads My::Schema::CD, My::Schema::Artist, @@ -347,428 +348,208 @@ sub load_classes { } } -=head2 load_namespaces +=head2 storage_type =over 4 -=item Arguments: %options? +=item Arguments: $storage_type|{$storage_type, \%args} + +=item Return value: $storage_type|{$storage_type, \%args} + +=item Default value: DBIx::Class::Storage::DBI =back -This is an alternative to L above which assumes an alternative -layout for automatic class loading. It assumes that all result -classes are underneath a sub-namespace of the schema called C, any -corresponding ResultSet classes are underneath a sub-namespace of the schema -called C. +Set the storage class that will be instantiated when L is called. +If the classname starts with C<::>, the prefix C is +assumed by L. -Both of the sub-namespaces are configurable if you don't like the defaults, -via the options C and C. +You want to use this to set subclasses of L +in cases where the appropriate subclass is not autodetected, such as +when dealing with MSSQL via L, in which case you'd set it +to C<::DBI::Sybase::MSSQL>. -If (and only if) you specify the option C, any found -Result classes for which we do not find a corresponding -ResultSet class will have their C set to -C. +If your storage type requires instantiation arguments, those are +defined as a second argument in the form of a hashref and the entire +value needs to be wrapped into an arrayref or a hashref. We support +both types of refs here in order to play nice with your +Config::[class] or your choice. See +L for an example of this. -C takes care of calling C for you where -neccessary if you didn't do it for yourself. +=head2 exception_action -All of the namespace and classname options to this method are relative to -the schema classname by default. To specify a fully-qualified name, prefix -it with a literal C<+>. - -Examples: - - # load My::Schema::Result::CD, My::Schema::Result::Artist, - # My::Schema::ResultSet::CD, etc... - My::Schema->load_namespaces; - - # Override everything to use ugly names. - # In this example, if there is a My::Schema::Res::Foo, but no matching - # My::Schema::RSets::Foo, then Foo will have its - # resultset_class set to My::Schema::RSetBase - My::Schema->load_namespaces( - result_namespace => 'Res', - resultset_namespace => 'RSets', - default_resultset_class => 'RSetBase', - ); - - # Put things in other namespaces - My::Schema->load_namespaces( - result_namespace => '+Some::Place::Results', - resultset_namespace => '+Another::Place::RSets', - ); +=over 4 -If you'd like to use multiple namespaces of each type, simply use an arrayref -of namespaces for that option. In the case that the same result -(or resultset) class exists in multiple namespaces, the latter entries in -your list of namespaces will override earlier ones. +=item Arguments: $code_reference - My::Schema->load_namespaces( - # My::Schema::Results_C::Foo takes precedence over My::Schema::Results_B::Foo : - result_namespace => [ 'Results_A', 'Results_B', 'Results_C' ], - resultset_namespace => [ '+Some::Place::RSets', 'RSets' ], - ); +=item Return value: $code_reference -=cut +=item Default value: None -# Pre-pends our classname to the given relative classname or -# class namespace, unless there is a '+' prefix, which will -# be stripped. -sub _expand_relative_name { - my ($class, $name) = @_; - return if !$name; - $name = $class . '::' . $name if ! ($name =~ s/^\+//); - return $name; -} +=back -# returns a hash of $shortname => $fullname for every package -# found in the given namespaces ($shortname is with the $fullname's -# namespace stripped off) -sub _map_namespaces { - my ($class, @namespaces) = @_; +If C is set for this class/object, L +will prefer to call this code reference with the exception as an argument, +rather than L. - my @results_hash; - foreach my $namespace (@namespaces) { - push( - @results_hash, - map { (substr($_, length "${namespace}::"), $_) } - Module::Find::findallmod($namespace) - ); - } +Your subroutine should probably just wrap the error in the exception +object/class of your choosing and rethrow. If, against all sage advice, +you'd like your C to suppress a particular exception +completely, simply have it return true. - @results_hash; -} +Example: -sub load_namespaces { - my ($class, %args) = @_; + package My::Schema; + use base qw/DBIx::Class::Schema/; + use My::ExceptionClass; + __PACKAGE__->exception_action(sub { My::ExceptionClass->throw(@_) }); + __PACKAGE__->load_classes; - my $result_namespace = delete $args{result_namespace} || 'Result'; - my $resultset_namespace = delete $args{resultset_namespace} || 'ResultSet'; - my $default_resultset_class = delete $args{default_resultset_class}; + # or: + my $schema_obj = My::Schema->connect( .... ); + $schema_obj->exception_action(sub { My::ExceptionClass->throw(@_) }); - $class->throw_exception('load_namespaces: unknown option(s): ' - . join(q{,}, map { qq{'$_'} } keys %args)) - if scalar keys %args; + # suppress all exceptions, like a moron: + $schema_obj->exception_action(sub { 1 }); - $default_resultset_class - = $class->_expand_relative_name($default_resultset_class); +=head2 stacktrace - for my $arg ($result_namespace, $resultset_namespace) { - $arg = [ $arg ] if !ref($arg) && $arg; +=over 4 - $class->throw_exception('load_namespaces: namespace arguments must be ' - . 'a simple string or an arrayref') - if ref($arg) ne 'ARRAY'; +=item Arguments: boolean - $_ = $class->_expand_relative_name($_) for (@$arg); - } +=back - my %results = $class->_map_namespaces(@$result_namespace); - my %resultsets = $class->_map_namespaces(@$resultset_namespace); +Whether L should include stack trace information. +Defaults to false normally, but defaults to true if C<$ENV{DBIC_TRACE}> +is true. - my @to_register; - { - no warnings 'redefine'; - local *Class::C3::reinitialize = sub { }; - use warnings 'redefine'; +=head2 sqlt_deploy_hook - foreach my $result (keys %results) { - my $result_class = $results{$result}; - $class->ensure_class_loaded($result_class); - $result_class->source_name($result) unless $result_class->source_name; +=over - my $rs_class = delete $resultsets{$result}; - my $rs_set = $result_class->resultset_class; - if($rs_set && $rs_set ne 'DBIx::Class::ResultSet') { - if($rs_class && $rs_class ne $rs_set) { - warn "We found ResultSet class '$rs_class' for '$result', but it seems " - . "that you had already set '$result' to use '$rs_set' instead"; - } - } - elsif($rs_class ||= $default_resultset_class) { - $class->ensure_class_loaded($rs_class); - $result_class->resultset_class($rs_class); - } +=item Arguments: $sqlt_schema - push(@to_register, [ $result_class->source_name, $result_class ]); - } - } +=back - foreach (sort keys %resultsets) { - warn "load_namespaces found ResultSet class $_ with no " - . 'corresponding Result class'; - } +An optional sub which you can declare in your own Schema class that will get +passed the L object when you deploy the schema via +L or L. - Class::C3->reinitialize; - $class->register_class(@$_) for (@to_register); +For an example of what you can do with this, see +L. - return; -} +=head1 METHODS -=head2 compose_connection (DEPRECATED) +=head2 connect =over 4 -=item Arguments: $target_namespace, @db_info +=item Arguments: @connectinfo =item Return Value: $new_schema =back -DEPRECATED. You probably wanted compose_namespace. - -Actually, you probably just wanted to call connect. - -=begin hidden +Creates and returns a new Schema object. The connection info set on it +is used to create a new instance of the storage backend and set it on +the Schema object. -(hidden due to deprecation) - -Calls L to the target namespace, -calls L with @db_info on the new schema, -then injects the L component and a -resultset_instance classdata entry on all the new classes, in order to support -$target_namespaces::$class->search(...) method calls. - -This is primarily useful when you have a specific need for class method access -to a connection. In normal usage it is preferred to call -L and use the resulting schema object to operate -on L objects with L for -more information. - -=end hidden +See L for DBI-specific +syntax on the C>@connectinfo> argument, or L in +general. =cut -{ - my $warn; - - sub compose_connection { - my ($self, $target, @info) = @_; - - warn "compose_connection deprecated as of 0.08000" - unless ($INC{"DBIx/Class/CDBICompat.pm"} || $warn++); - - my $base = 'DBIx::Class::ResultSetProxy'; - eval "require ${base};"; - $self->throw_exception - ("No arguments to load_classes and couldn't load ${base} ($@)") - if $@; - - if ($self eq $target) { - # Pathological case, largely caused by the docs on early C::M::DBIC::Plain - foreach my $moniker ($self->sources) { - my $source = $self->source($moniker); - my $class = $source->result_class; - $self->inject_base($class, $base); - $class->mk_classdata(resultset_instance => $source->resultset); - $class->mk_classdata(class_resolver => $self); - } - $self->connection(@info); - return $self; - } - - my $schema = $self->compose_namespace($target, $base); - { - no strict 'refs'; - my $name = join '::', $target, 'schema'; - *$name = Sub::Name::subname $name, sub { $schema }; - } - - $schema->connection(@info); - foreach my $moniker ($schema->sources) { - my $source = $schema->source($moniker); - my $class = $source->result_class; - #warn "$moniker $class $source ".$source->storage; - $class->mk_classdata(result_source_instance => $source); - $class->mk_classdata(resultset_instance => $source->resultset); - $class->mk_classdata(class_resolver => $schema); - } - return $schema; - } -} +sub connect { shift->clone->connection(@_) } -=head2 compose_namespace +=head2 resultset =over 4 -=item Arguments: $target_namespace, $additional_base_class? +=item Arguments: $source_name -=item Return Value: $new_schema +=item Return Value: $resultset =back -For each L in the schema, this method creates a -class in the target namespace (e.g. $target_namespace::CD, -$target_namespace::Artist) that inherits from the corresponding classes -attached to the current schema. - -It also attaches a corresponding L object to the -new $schema object. If C<$additional_base_class> is given, the new composed -classes will inherit from first the corresponding classe from the current -schema then the base class. - -For example, for a schema with My::Schema::CD and My::Schema::Artist classes, - - $schema->compose_namespace('My::DB', 'Base::Class'); - print join (', ', @My::DB::CD::ISA) . "\n"; - print join (', ', @My::DB::Artist::ISA) ."\n"; - -will produce the output + my $rs = $schema->resultset('DVD'); - My::Schema::CD, Base::Class - My::Schema::Artist, Base::Class +Returns the L object for the registered source +name. =cut -# this might be oversimplified -# sub compose_namespace { -# my ($self, $target, $base) = @_; - -# my $schema = $self->clone; -# foreach my $moniker ($schema->sources) { -# my $source = $schema->source($moniker); -# my $target_class = "${target}::${moniker}"; -# $self->inject_base( -# $target_class => $source->result_class, ($base ? $base : ()) -# ); -# $source->result_class($target_class); -# $target_class->result_source_instance($source) -# if $target_class->can('result_source_instance'); -# $schema->register_source($moniker, $source); -# } -# return $schema; -# } - -sub compose_namespace { - my ($self, $target, $base) = @_; - my $schema = $self->clone; - { - no warnings qw/redefine/; -# local *Class::C3::reinitialize = sub { }; - foreach my $moniker ($schema->sources) { - my $source = $schema->source($moniker); - my $target_class = "${target}::${moniker}"; - $self->inject_base( - $target_class => $source->result_class, ($base ? $base : ()) - ); - $source->result_class($target_class); - $target_class->result_source_instance($source) - if $target_class->can('result_source_instance'); - $schema->register_source($moniker, $source); - } - } -# Class::C3->reinitialize(); - { - no strict 'refs'; - no warnings 'redefine'; - foreach my $meth (qw/class source resultset/) { - *{"${target}::${meth}"} = - sub { shift->schema->$meth(@_) }; - } - } - return $schema; -} - -sub setup_connection_class { - my ($class, $target, @info) = @_; - $class->inject_base($target => 'DBIx::Class::DB'); - #$target->load_components('DB'); - $target->connection(@info); +sub resultset { + my ($self, $moniker) = @_; + return $self->source($moniker)->resultset; } -=head2 storage_type +=head2 sources =over 4 -=item Arguments: $storage_type|{$storage_type, \%args} - -=item Return Value: $storage_type|{$storage_type, \%args} +=item Return Value: @source_names =back -Set the storage class that will be instantiated when L is called. -If the classname starts with C<::>, the prefix C is -assumed by L. Defaults to C<::DBI>, -which is L. + my @source_names = $schema->sources; -You want to use this to hardcoded subclasses of L -in cases where the appropriate subclass is not autodetected, such as when -dealing with MSSQL via L, in which case you'd set it to -C<::DBI::Sybase::MSSQL>. +Lists names of all the sources registered on this Schema object. -If your storage type requires instantiation arguments, those are defined as a -second argument in the form of a hashref and the entire value needs to be -wrapped into an arrayref or a hashref. We support both types of refs here in -order to play nice with your Config::[class] or your choice. +=cut -See L for an example of this. +sub sources { return keys %{shift->source_registrations}; } -=head2 connection +=head2 source =over 4 -=item Arguments: @args +=item Arguments: $source_name -=item Return Value: $new_schema +=item Return Value: $result_source =back -Instantiates a new Storage object of type -L and passes the arguments to -$storage->connect_info. Sets the connection in-place on the schema. + my $source = $schema->source('Book'); -See L for DBI-specific syntax, -or L in general. +Returns the L object for the registered +source name. =cut -sub connection { - my ($self, @info) = @_; - return $self if !@info && $self->storage; - - my ($storage_class, $args) = ref $self->storage_type ? - ($self->_normalize_storage_type($self->storage_type),{}) : ($self->storage_type, {}); - - $storage_class = 'DBIx::Class::Storage'.$storage_class - if $storage_class =~ m/^::/; - eval "require ${storage_class};"; - $self->throw_exception( - "No arguments to load_classes and couldn't load ${storage_class} ($@)" - ) if $@; - my $storage = $storage_class->new($self=>$args); - $storage->connect_info(\@info); - $self->storage($storage); - return $self; -} - -sub _normalize_storage_type { - my ($self, $storage_type) = @_; - if(ref $storage_type eq 'ARRAY') { - return @$storage_type; - } elsif(ref $storage_type eq 'HASH') { - return %$storage_type; - } else { - $self->throw_exception('Unsupported REFTYPE given: '. ref $storage_type); - } +sub source { + my ($self, $moniker) = @_; + my $sreg = $self->source_registrations; + return $sreg->{$moniker} if exists $sreg->{$moniker}; + + # if we got here, they probably passed a full class name + my $mapped = $self->class_mappings->{$moniker}; + $self->throw_exception("Can't find source for ${moniker}") + unless $mapped && exists $sreg->{$mapped}; + return $sreg->{$mapped}; } -=head2 connect +=head2 class =over 4 -=item Arguments: @info +=item Arguments: $source_name -=item Return Value: $new_schema +=item Return Value: $classname =back -This is a convenience method. It is equivalent to calling -$schema->clone->connection(@info). See L and L for more -information. + my $class = $schema->class('CD'); + +Retrieves the Result class name for the given source name. =cut -sub connect { shift->clone->connection(@_) } +sub class { + my ($self, $moniker) = @_; + return $self->source($moniker)->result_class; +} =head2 txn_do @@ -865,87 +646,14 @@ sub txn_rollback { $self->storage->txn_rollback; } -=head2 svp_begin - -Creates a new savepoint (does nothing outside a transaction). -Equivalent to calling $schema->storage->svp_begin. See -L for more information. - -=cut - -sub svp_begin { - my ($self, $name) = @_; - - $self->storage or $self->throw_exception - ('svp_begin called on $schema without storage'); - - $self->storage->svp_begin($name); -} - -=head2 svp_release - -Releases a savepoint (does nothing outside a transaction). -Equivalent to calling $schema->storage->svp_release. See -L for more information. - -=cut - -sub svp_release { - my ($self, $name) = @_; - - $self->storage or $self->throw_exception - ('svp_release called on $schema without storage'); - - $self->storage->svp_release($name); -} - -=head2 svp_rollback - -Rollback to a savepoint (does nothing outside a transaction). -Equivalent to calling $schema->storage->svp_rollback. See -L for more information. - -=cut - -sub svp_rollback { - my ($self, $name) = @_; - - $self->storage or $self->throw_exception - ('svp_rollback called on $schema without storage'); - - $self->storage->svp_rollback($name); -} - -=head2 clone - -=over 4 - -=item Return Value: $new_schema - -=back - -Clones the schema and its associated result_source objects and returns the -copy. - -=cut +=head2 storage -sub clone { - my ($self) = @_; - my $clone = { (ref $self ? %$self : ()) }; - bless $clone, (ref $self || $self); + my $storage = $schema->storage; - $clone->class_mappings({ %{$clone->class_mappings} }); - $clone->source_registrations({ %{$clone->source_registrations} }); - foreach my $moniker ($self->sources) { - my $source = $self->source($moniker); - my $new = $source->new($source); - # we use extra here as we want to leave the class_mappings as they are - # but overwrite the source_registrations entry with the new source - $clone->register_extra_source($moniker => $new); - } - $clone->storage->set_schema($clone) if $clone->storage; - return $clone; -} +Returns the L object for this Schema. Grab this +if you want to turn on SQL statement debugging at runtime, or set the +quote character. For the default storage, the documentation can be +found in L. =head2 populate @@ -953,6 +661,8 @@ sub clone { =item Arguments: $source_name, \@data; +=item Return value: \@$objects | nothing + =back Pass this method a resultsource name, and an arrayref of @@ -1015,49 +725,223 @@ sub populate { $rs->populate(\@results_to_create); } -=head2 exception_action +=head2 connection + +=over 4 + +=item Arguments: @args + +=item Return Value: $new_schema + +=back + +Similar to L except sets the storage object and connection +data in-place on the Schema class. You should probably be calling +L to get a proper Schema object instead. + + +=cut + +sub connection { + my ($self, @info) = @_; + return $self if !@info && $self->storage; + + my ($storage_class, $args) = ref $self->storage_type ? + ($self->_normalize_storage_type($self->storage_type),{}) : ($self->storage_type, {}); + + $storage_class = 'DBIx::Class::Storage'.$storage_class + if $storage_class =~ m/^::/; + eval "require ${storage_class};"; + $self->throw_exception( + "No arguments to load_classes and couldn't load ${storage_class} ($@)" + ) if $@; + my $storage = $storage_class->new($self=>$args); + $storage->connect_info(\@info); + $self->storage($storage); + return $self; +} + +sub _normalize_storage_type { + my ($self, $storage_type) = @_; + if(ref $storage_type eq 'ARRAY') { + return @$storage_type; + } elsif(ref $storage_type eq 'HASH') { + return %$storage_type; + } else { + $self->throw_exception('Unsupported REFTYPE given: '. ref $storage_type); + } +} + +=head2 compose_namespace =over 4 -=item Arguments: $code_reference +=item Arguments: $target_namespace, $additional_base_class? + +=item Retur Value: $new_schema + +=back + +For each L in the schema, this method creates a +class in the target namespace (e.g. $target_namespace::CD, +$target_namespace::Artist) that inherits from the corresponding classes +attached to the current schema. + +It also attaches a corresponding L object to the +new $schema object. If C<$additional_base_class> is given, the new composed +classes will inherit from first the corresponding classe from the current +schema then the base class. + +For example, for a schema with My::Schema::CD and My::Schema::Artist classes, + + $schema->compose_namespace('My::DB', 'Base::Class'); + print join (', ', @My::DB::CD::ISA) . "\n"; + print join (', ', @My::DB::Artist::ISA) ."\n"; + +will produce the output + + My::Schema::CD, Base::Class + My::Schema::Artist, Base::Class + +=cut + +# this might be oversimplified +# sub compose_namespace { +# my ($self, $target, $base) = @_; + +# my $schema = $self->clone; +# foreach my $moniker ($schema->sources) { +# my $source = $schema->source($moniker); +# my $target_class = "${target}::${moniker}"; +# $self->inject_base( +# $target_class => $source->result_class, ($base ? $base : ()) +# ); +# $source->result_class($target_class); +# $target_class->result_source_instance($source) +# if $target_class->can('result_source_instance'); +# $schema->register_source($moniker, $source); +# } +# return $schema; +# } + +sub compose_namespace { + my ($self, $target, $base) = @_; + my $schema = $self->clone; + { + no warnings qw/redefine/; +# local *Class::C3::reinitialize = sub { }; + foreach my $moniker ($schema->sources) { + my $source = $schema->source($moniker); + my $target_class = "${target}::${moniker}"; + $self->inject_base( + $target_class => $source->result_class, ($base ? $base : ()) + ); + $source->result_class($target_class); + $target_class->result_source_instance($source) + if $target_class->can('result_source_instance'); + $schema->register_source($moniker, $source); + } + } +# Class::C3->reinitialize(); + { + no strict 'refs'; + no warnings 'redefine'; + foreach my $meth (qw/class source resultset/) { + *{"${target}::${meth}"} = + sub { shift->schema->$meth(@_) }; + } + } + return $schema; +} + +sub setup_connection_class { + my ($class, $target, @info) = @_; + $class->inject_base($target => 'DBIx::Class::DB'); + #$target->load_components('DB'); + $target->connection(@info); +} + +=head2 svp_begin + +Creates a new savepoint (does nothing outside a transaction). +Equivalent to calling $schema->storage->svp_begin. See +L for more information. + +=cut + +sub svp_begin { + my ($self, $name) = @_; + + $self->storage or $self->throw_exception + ('svp_begin called on $schema without storage'); + + $self->storage->svp_begin($name); +} + +=head2 svp_release + +Releases a savepoint (does nothing outside a transaction). +Equivalent to calling $schema->storage->svp_release. See +L for more information. + +=cut + +sub svp_release { + my ($self, $name) = @_; + + $self->storage or $self->throw_exception + ('svp_release called on $schema without storage'); -=back + $self->storage->svp_release($name); +} -If C is set for this class/object, L -will prefer to call this code reference with the exception as an argument, -rather than its normal C or C action. +=head2 svp_rollback -Your subroutine should probably just wrap the error in the exception -object/class of your choosing and rethrow. If, against all sage advice, -you'd like your C to suppress a particular exception -completely, simply have it return true. +Rollback to a savepoint (does nothing outside a transaction). +Equivalent to calling $schema->storage->svp_rollback. See +L for more information. -Example: +=cut - package My::Schema; - use base qw/DBIx::Class::Schema/; - use My::ExceptionClass; - __PACKAGE__->exception_action(sub { My::ExceptionClass->throw(@_) }); - __PACKAGE__->load_classes; +sub svp_rollback { + my ($self, $name) = @_; - # or: - my $schema_obj = My::Schema->connect( .... ); - $schema_obj->exception_action(sub { My::ExceptionClass->throw(@_) }); + $self->storage or $self->throw_exception + ('svp_rollback called on $schema without storage'); - # suppress all exceptions, like a moron: - $schema_obj->exception_action(sub { 1 }); + $self->storage->svp_rollback($name); +} -=head2 stacktrace +=head2 clone =over 4 -=item Arguments: boolean +=item Return Value: $new_schema =back -Whether L should include stack trace information. -Defaults to false normally, but defaults to true if C<$ENV{DBIC_TRACE}> -is true. +Clones the schema and its associated result_source objects and returns the +copy. + +=cut + +sub clone { + my ($self) = @_; + my $clone = { (ref $self ? %$self : ()) }; + bless $clone, (ref $self || $self); + + $clone->class_mappings({ %{$clone->class_mappings} }); + $clone->source_registrations({ %{$clone->source_registrations} }); + foreach my $moniker ($self->sources) { + my $source = $self->source($moniker); + my $new = $source->new($source); + # we use extra here as we want to leave the class_mappings as they are + # but overwrite the source_registrations entry with the new source + $clone->register_extra_source($moniker => $new); + } + $clone->storage->set_schema($clone) if $clone->storage; + return $clone; +} =head2 throw_exception @@ -1115,13 +999,17 @@ sub deploy { =item Arguments: $rdbms_type, $sqlt_args, $dir +=item Return value: $listofstatements + =back -A convenient shortcut to storage->deployment_statements(). Returns the SQL statements -used by L and L. C<$rdbms_type> provides -the (optional) SQLT (not DBI) database driver name for which the SQL statements are produced. -If not supplied, the type is determined by interrogating the current connection. -The other two arguments are identical to those of L. +A convenient shortcut to storage->deployment_statements(). Returns the +SQL statements used by L and +L. C<$rdbms_type> provides the +(optional) SQLT (not DBI) database driver name for which the SQL +statements are produced. If not supplied, the type is determined by +interrogating the current connection. The other two arguments are +identical to those of L. =cut @@ -1190,6 +1078,8 @@ sub create_ddl_dir { =item Arguments: $database-type, $version, $directory, $preversion +=item Return value: $normalised_filename + =back my $filename = $table->ddl_filename($type, $version, $dir, $preversion) @@ -1214,18 +1104,9 @@ sub ddl_filename { return $filename; } -=head2 sqlt_deploy_hook($sqlt_schema) - -An optional sub which you can declare in your own Schema class that will get -passed the L object when you deploy the schema via -L or L. - -For an example of what you can do with this, see -L. - =head2 thaw -Provided as the recommened way of thawing schema objects. You can call +Provided as the recommended way of thawing schema objects. You can call C directly if you wish, but the thawed objects will not have a reference to any schema, so are rather useless @@ -1263,7 +1144,7 @@ sub dclone { =head2 schema_version -Returns the current schema class' $VERSION +Returns the current schema class' $VERSION in a normalised way. =cut @@ -1284,6 +1165,192 @@ sub schema_version { return $version; } + +=head2 register_class + +=over 4 + +=item Arguments: $moniker, $component_class + +=back + +This method is called by L and L to install the found classes into your Schema. You should be using those instead of this one. + +You will only need this method if you have your Result classes in +files which are not named after the packages (or all in the same +file). You may also need it to register classes at runtime. + +Registers a class which isa DBIx::Class::ResultSourceProxy. Equivalent to +calling: + + $schema->register_source($moniker, $component_class->result_source_instance); + +=cut + +sub register_class { + my ($self, $moniker, $to_register) = @_; + $self->register_source($moniker => $to_register->result_source_instance); +} + +=head2 register_source + +=over 4 + +=item Arguments: $moniker, $result_source + +=back + +This method is called by L. + +Registers the L in the schema with the given +moniker. + +=cut + +sub register_source { + my $self = shift; + + $self->_register_source(@_); +} + +=head2 register_extra_source + +=over 4 + +=item Arguments: $moniker, $result_source + +=back + +As L but should be used if the result class already +has a source and you want to register an extra one. + +=cut + +sub register_extra_source { + my $self = shift; + + $self->_register_source(@_, { extra => 1 }); +} + +sub _register_source { + my ($self, $moniker, $source, $params) = @_; + + %$source = %{ $source->new( { %$source, source_name => $moniker }) }; + + my %reg = %{$self->source_registrations}; + $reg{$moniker} = $source; + $self->source_registrations(\%reg); + + $source->schema($self); + weaken($source->{schema}) if ref($self); + return if ($params->{extra}); + + if ($source->result_class) { + my %map = %{$self->class_mappings}; + if (exists $map{$source->result_class}) { + warn $source->result_class . ' already has a source, use register_extra_source for additional sources'; + } + $map{$source->result_class} = $moniker; + $self->class_mappings(\%map); + } +} + +sub _unregister_source { + my ($self, $moniker) = @_; + my %reg = %{$self->source_registrations}; + + my $source = delete $reg{$moniker}; + $self->source_registrations(\%reg); + if ($source->result_class) { + my %map = %{$self->class_mappings}; + delete $map{$source->result_class}; + $self->class_mappings(\%map); + } +} + + +=head2 compose_connection (DEPRECATED) + +=over 4 + +=item Arguments: $target_namespace, @db_info + +=item Return Value: $new_schema + +=back + +DEPRECATED. You probably wanted compose_namespace. + +Actually, you probably just wanted to call connect. + +=begin hidden + +(hidden due to deprecation) + +Calls L to the target namespace, +calls L with @db_info on the new schema, +then injects the L component and a +resultset_instance classdata entry on all the new classes, in order to support +$target_namespaces::$class->search(...) method calls. + +This is primarily useful when you have a specific need for class method access +to a connection. In normal usage it is preferred to call +L and use the resulting schema object to operate +on L objects with L for +more information. + +=end hidden + +=cut + +{ + my $warn; + + sub compose_connection { + my ($self, $target, @info) = @_; + + warn "compose_connection deprecated as of 0.08000" + unless ($INC{"DBIx/Class/CDBICompat.pm"} || $warn++); + + my $base = 'DBIx::Class::ResultSetProxy'; + eval "require ${base};"; + $self->throw_exception + ("No arguments to load_classes and couldn't load ${base} ($@)") + if $@; + + if ($self eq $target) { + # Pathological case, largely caused by the docs on early C::M::DBIC::Plain + foreach my $moniker ($self->sources) { + my $source = $self->source($moniker); + my $class = $source->result_class; + $self->inject_base($class, $base); + $class->mk_classdata(resultset_instance => $source->resultset); + $class->mk_classdata(class_resolver => $self); + } + $self->connection(@info); + return $self; + } + + my $schema = $self->compose_namespace($target, $base); + { + no strict 'refs'; + my $name = join '::', $target, 'schema'; + *$name = Sub::Name::subname $name, sub { $schema }; + } + + $schema->connection(@info); + foreach my $moniker ($schema->sources) { + my $source = $schema->source($moniker); + my $class = $source->result_class; + #warn "$moniker $class $source ".$source->storage; + $class->mk_classdata(result_source_instance => $source); + $class->mk_classdata(resultset_instance => $source->resultset); + $class->mk_classdata(class_resolver => $schema); + } + return $schema; + } +} + 1; =head1 AUTHORS