package DBIx::Class::Schema;
use strict;
use warnings;
use base 'DBIx::Class';
use DBIx::Class::Carp;
use Try::Tiny;
use Scalar::Util qw/weaken blessed/;
use Sub::Name 'subname';
use B 'svref_2object';
use Devel::GlobalDestruction;
use namespace::clean;
__PACKAGE__->mk_classdata('class_mappings' => {});
__PACKAGE__->mk_classdata('source_registrations' => {});
__PACKAGE__->mk_classdata('storage_type' => '::DBI');
__PACKAGE__->mk_classdata('storage');
__PACKAGE__->mk_classdata('exception_action');
__PACKAGE__->mk_classdata('stacktrace' => $ENV{DBIC_TRACE} || 0);
__PACKAGE__->mk_classdata('default_resultset_attributes' => {});
=head1 NAME
DBIx::Class::Schema - composable schemas
=head1 SYNOPSIS
package Library::Schema;
use base qw/DBIx::Class::Schema/;
# load all Result classes in Library/Schema/Result/
__PACKAGE__->load_namespaces();
package Library::Schema::Result::CD;
use base qw/DBIx::Class::Core/;
__PACKAGE__->load_components(qw/InflateColumn::DateTime/); # for example
__PACKAGE__->table('cd');
# Elsewhere in your code:
my $schema1 = Library::Schema->connect(
$dsn,
$user,
$password,
{ AutoCommit => 1 },
);
my $schema2 = Library::Schema->connect($coderef_returning_dbh);
# fetch objects using Library::Schema::Result::DVD
my $resultset = $schema1->resultset('DVD')->search( ... );
my @dvd_objects = $schema2->resultset('DVD')->search( ... );
=head1 DESCRIPTION
Creates database classes based on a schema. This is the recommended way to
use L<DBIx::Class> and allows you to use more than one concurrent connection
with your classes.
NB: If you're used to L<Class::DBI> it's worth reading the L</SYNOPSIS>
carefully, as DBIx::Class does things a little differently. Note in
particular which module inherits off which.
=head1 SETUP METHODS
=head2 load_namespaces
=over 4
=item Arguments: %options?
=back
package MyApp::Schema;
__PACKAGE__->load_namespaces();
__PACKAGE__->load_namespaces(
result_namespace => 'Res',
resultset_namespace => 'RSet',
default_resultset_class => '+MyApp::Othernamespace::RSet',
);
With no arguments, this method uses L<Module::Find> to load all of the
Result and ResultSet classes under the namespace of the schema from
which it is called. For example, C<My::Schema> will by default find
and load Result classes named C<My::Schema::Result::*> and ResultSet
classes named C<My::Schema::ResultSet::*>.
ResultSet classes are associated with Result class of the same name.
For example, C<My::Schema::Result::CD> will get the ResultSet class
C<My::Schema::ResultSet::CD> if it is present.
Both Result and ResultSet namespaces are configurable via the
C<result_namespace> and C<resultset_namespace> options.
Another option, C<default_resultset_class> specifies a custom default
ResultSet class for Result classes with no corresponding ResultSet.
All of the namespace and classname options are by default relative to
the schema classname. To specify a fully-qualified name, prefix it
with a literal C<+>. For example, C<+Other::NameSpace::Result>.
=head3 Warnings
You will be warned if ResultSet classes are discovered for which there
are no matching Result classes like this:
load_namespaces found ResultSet class $classname with no corresponding Result class
If a Result class is found to already have a ResultSet class set using
L</resultset_class> to some other class, you will be warned like this:
We found ResultSet class '$rs_class' for '$result', but it seems
that you had already set '$result' to use '$rs_set' instead
=head3 Examples
# load My::Schema::Result::CD, My::Schema::Result::Artist,
# My::Schema::ResultSet::CD, etc...
My::Schema->load_namespaces;
# Override everything to use ugly names.
# In this example, if there is a My::Schema::Res::Foo, but no matching
# My::Schema::RSets::Foo, then Foo will have its
# resultset_class set to My::Schema::RSetBase
My::Schema->load_namespaces(
result_namespace => 'Res',
resultset_namespace => 'RSets',
default_resultset_class => 'RSetBase',
);
# Put things in other namespaces
My::Schema->load_namespaces(
result_namespace => '+Some::Place::Results',
resultset_namespace => '+Another::Place::RSets',
);
To search multiple namespaces for either Result or ResultSet classes,
use an arrayref of namespaces for that option. In the case that the
same result (or resultset) class exists in multiple namespaces, later
entries in the list of namespaces will override earlier ones.
My::Schema->load_namespaces(
# My::Schema::Results_C::Foo takes precedence over My::Schema::Results_B::Foo :
result_namespace => [ 'Results_A', 'Results_B', 'Results_C' ],
resultset_namespace => [ '+Some::Place::RSets', 'RSets' ],
);
=cut
# Pre-pends our classname to the given relative classname or
# class namespace, unless there is a '+' prefix, which will
# be stripped.
sub _expand_relative_name {
my ($class, $name) = @_;
return if !$name;
$name = $class . '::' . $name if ! ($name =~ s/^\+//);
return $name;
}
# Finds all modules in the supplied namespace, or if omitted in the
# namespace of $class. Untaints all findings as they can be assumed
# to be safe
sub _findallmod {
my $proto = shift;
my $ns = shift || ref $proto || $proto;
require Module::Find;
# untaint result
return map { $_ =~ /(.+)/ } Module::Find::findallmod($ns);
}
# 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) = @_;
my @results_hash;
foreach my $namespace (@namespaces) {
push(
@results_hash,
map { (substr($_, length "${namespace}::"), $_) }
$class->_findallmod($namespace)
);
}
@results_hash;
}
# returns the result_source_instance for the passed class/object,
# or dies with an informative message (used by load_namespaces)
sub _ns_get_rsrc_instance {
my $me = shift;
my $rs_class = ref ($_[0]) || $_[0];
return try {
$rs_class->result_source_instance
} catch {
$me->throw_exception (
"Attempt to load_namespaces() class $rs_class failed - are you sure this is a real Result Class?: $_"
);
};
}
sub load_namespaces {
my ($class, %args) = @_;
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};
$class->throw_exception('load_namespaces: unknown option(s): '
. join(q{,}, map { qq{'$_'} } keys %args))
if scalar keys %args;
$default_resultset_class
= $class->_expand_relative_name($default_resultset_class);
for my $arg ($result_namespace, $resultset_namespace) {
$arg = [ $arg ] if !ref($arg) && $arg;
$class->throw_exception('load_namespaces: namespace arguments must be '
. 'a simple string or an arrayref')
if ref($arg) ne 'ARRAY';
$_ = $class->_expand_relative_name($_) for (@$arg);
}
my %results = $class->_map_namespaces(@$result_namespace);
my %resultsets = $class->_map_namespaces(@$resultset_namespace);
my @to_register;
{
no warnings qw/redefine/;
local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
use warnings qw/redefine/;
# ensure classes are loaded and attached in inheritance order
for my $res (values %results) {
$class->ensure_class_loaded($res);
}
my %inh_idx;
my @subclass_last = sort {
($inh_idx{$a} ||=
scalar @{mro::get_linear_isa( $results{$a} )}
)
<=>
($inh_idx{$b} ||=
scalar @{mro::get_linear_isa( $results{$b} )}
)
} keys(%results);
foreach my $result (@subclass_last) {
my $result_class = $results{$result};
my $rs_class = delete $resultsets{$result};
my $rs_set = $class->_ns_get_rsrc_instance ($result_class)->resultset_class;
if($rs_set && $rs_set ne 'DBIx::Class::ResultSet') {
if($rs_class && $rs_class ne $rs_set) {
carp "We found ResultSet class '$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);
if(!$rs_class->isa("DBIx::Class::ResultSet")) {
carp "load_namespaces found ResultSet class $rs_class that does not subclass DBIx::Class::ResultSet";
}
$class->_ns_get_rsrc_instance ($result_class)->resultset_class($rs_class);
}
my $source_name = $class->_ns_get_rsrc_instance ($result_class)->source_name || $result;
push(@to_register, [ $source_name, $result_class ]);
}
}
foreach (sort keys %resultsets) {
carp "load_namespaces found ResultSet class $_ with no "
. 'corresponding Result class';
}
Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
$class->register_class(@$_) for (@to_register);
return;
}
=head2 load_classes
=over 4
=item Arguments: @classes?, { $namespace => [ @classes ] }+
=back
L</load_classes> is an alternative method to L</load_namespaces>, both of
which serve similar purposes, each with different advantages and disadvantages.
In the general case you should use L</load_namespaces>, unless you need to
be able to specify that only specific classes are loaded at runtime.
With no arguments, this method uses L<Module::Find> to find all classes under
the schema's namespace. Otherwise, this method loads the classes you specify
(using L<use>), and registers them (using L</"register_class">).
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<no warnings 'qw';> 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
$comp_class really a full DBIC result class? Fix it, move it elsewhere,
or make your load_classes call more specific.
Example:
My::Schema->load_classes(); # loads My::Schema::CD, My::Schema::Artist,
# etc. (anything under the My::Schema namespace)
# loads My::Schema::CD, My::Schema::Artist, Other::Namespace::Producer but
# not Other::Namespace::LinerNotes nor My::Schema::Track
My::Schema->load_classes(qw/ CD Artist #Track /, {
Other::Namespace => [qw/ Producer #LinerNotes /],
});
=cut
sub load_classes {
my ($class, @params) = @_;
my %comps_for;
if (@params) {
foreach my $param (@params) {
if (ref $param eq 'ARRAY') {
# filter out commented entries
my @modules = grep { $_ !~ /^#/ } @$param;
push (@{$comps_for{$class}}, @modules);
}
elsif (ref $param eq 'HASH') {
# more than one namespace possible
for my $comp ( keys %$param ) {
# filter out commented entries
my @modules = grep { $_ !~ /^#/ } @{$param->{$comp}};
push (@{$comps_for{$comp}}, @modules);
}
}
else {
# filter out commented entries
push (@{$comps_for{$class}}, $param) if $param !~ /^#/;
}
}
} else {
my @comp = map { substr $_, length "${class}::" }
$class->_findallmod;
$comps_for{$class} = \@comp;
}
my @to_register;
{
no warnings qw/redefine/;
local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
use warnings qw/redefine/;
foreach my $prefix (keys %comps_for) {
foreach my $comp (@{$comps_for{$prefix}||[]}) {
my $comp_class = "${prefix}::${comp}";
$class->ensure_class_loaded($comp_class);
my $snsub = $comp_class->can('source_name');
if(! $snsub ) {
carp "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.";
next;
}
$comp = $snsub->($comp_class) || $comp;
push(@to_register, [ $comp, $comp_class ]);
}
}
}
Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
foreach my $to (@to_register) {
$class->register_class(@$to);
}
}
=head2 storage_type
=over 4
=item Arguments: $storage_type|{$storage_type, \%args}
=item Return Value: $storage_type|{$storage_type, \%args}
=item Default value: DBIx::Class::Storage::DBI
=back
Set the storage class that will be instantiated when L</connect> is called.
If the classname starts with C<::>, the prefix C<DBIx::Class::Storage> is
assumed by L</connect>.
You want to use this to set subclasses of L<DBIx::Class::Storage::DBI>
in cases where the appropriate subclass is not autodetected.
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<DBIx::Class::Storage::DBI::Replicated> for an example of this.
=head2 exception_action
=over 4
=item Arguments: $code_reference
=item Return Value: $code_reference
=item Default value: None
=back
When L</throw_exception> is invoked and L</exception_action> is set to a code
reference, this reference will be called instead of
L<DBIx::Class::Exception/throw>, with the exception message passed as the only
argument.
Your custom throw code B<must> rethrow the exception, as L</throw_exception> is
an integral part of DBIC's internal execution control flow.
Example:
package My::Schema;
use base qw/DBIx::Class::Schema/;
use My::ExceptionClass;
__PACKAGE__->exception_action(sub { My::ExceptionClass->throw(@_) });
__PACKAGE__->load_classes;
# or:
my $schema_obj = My::Schema->connect( .... );
$schema_obj->exception_action(sub { My::ExceptionClass->throw(@_) });
=head2 stacktrace
=over 4
=item Arguments: boolean
=back
Whether L</throw_exception> should include stack trace information.
Defaults to false normally, but defaults to true if C<$ENV{DBIC_TRACE}>
is true.
=head2 sqlt_deploy_hook
=over
=item Arguments: $sqlt_schema
=back
An optional sub which you can declare in your own Schema class that will get
passed the L<SQL::Translator::Schema> object when you deploy the schema via
L</create_ddl_dir> or L</deploy>.
For an example of what you can do with this, see
L<DBIx::Class::Manual::Cookbook/Adding Indexes And Functions To Your SQL>.
Note that sqlt_deploy_hook is called by L</deployment_statements>, which in turn
is called before L</deploy>. Therefore the hook can be used only to manipulate
the L<SQL::Translator::Schema> object before it is turned into SQL fed to the
database. If you want to execute post-deploy statements which can not be generated
by L<SQL::Translator>, the currently suggested method is to overload L</deploy>
and use L<dbh_do|DBIx::Class::Storage::DBI/dbh_do>.
=head1 METHODS
=head2 connect
=over 4
=item Arguments: @connectinfo
=item Return Value: $new_schema
=back
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.
See L<DBIx::Class::Storage::DBI/"connect_info"> for DBI-specific
syntax on the C<@connectinfo> argument, or L<DBIx::Class::Storage> in
general.
Note that C<connect_info> expects an arrayref of arguments, but
C<connect> does not. C<connect> wraps its arguments in an arrayref
before passing them to C<connect_info>.
=head3 Overloading
C<connect> is a convenience method. It is equivalent to calling
$schema->clone->connection(@connectinfo). To write your own overloaded
version, overload L</connection> instead.
=cut
sub connect { shift->clone->connection(@_) }
=head2 resultset
=over 4
=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>
=item Return Value: L<$resultset|DBIx::Class::ResultSet>
=back
my $rs = $schema->resultset('DVD');
Returns the L<DBIx::Class::ResultSet> object for the registered source
name.
=cut
sub resultset {
my ($self, $source_name) = @_;
$self->throw_exception('resultset() expects a source name')
unless defined $source_name;
return $self->source($source_name)->resultset;
}
=head2 sources
=over 4
=item Return Value: L<@source_names|DBIx::Class::ResultSource/source_name>
=back
my @source_names = $schema->sources;
Lists names of all the sources registered on this Schema object.
=cut
sub sources { return keys %{shift->source_registrations}; }
=head2 source
=over 4
=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>
=item Return Value: L<$result_source|DBIx::Class::ResultSource>
=back
my $source = $schema->source('Book');
Returns the L<DBIx::Class::ResultSource> object for the registered
source name.
=cut
sub source {
my $self = shift;
$self->throw_exception("source() expects a source name")
unless @_;
my $source_name = shift;
my $sreg = $self->source_registrations;
return $sreg->{$source_name} if exists $sreg->{$source_name};
# if we got here, they probably passed a full class name
my $mapped = $self->class_mappings->{$source_name};
$self->throw_exception("Can't find source for ${source_name}")
unless $mapped && exists $sreg->{$mapped};
return $sreg->{$mapped};
}
=head2 class
=over 4
=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>
=item Return Value: $classname
=back
my $class = $schema->class('CD');
Retrieves the Result class name for the given source name.
=cut
sub class {
return shift->source(shift)->result_class;
}
=head2 txn_do
=over 4
=item Arguments: C<$coderef>, @coderef_args?
=item Return Value: The return value of $coderef
=back
Executes C<$coderef> with (optional) arguments C<@coderef_args> atomically,
returning its result (if any). Equivalent to calling $schema->storage->txn_do.
See L<DBIx::Class::Storage/"txn_do"> for more information.
This interface is preferred over using the individual methods L</txn_begin>,
L</txn_commit>, and L</txn_rollback> below.
WARNING: If you are connected with C<< AutoCommit => 0 >> the transaction is
considered nested, and you will still need to call L</txn_commit> to write your
changes when appropriate. You will also want to connect with C<< auto_savepoint =>
1 >> to get partial rollback to work, if the storage driver for your database
supports it.
Connecting with C<< AutoCommit => 1 >> is recommended.
=cut
sub txn_do {
my $self = shift;
$self->storage or $self->throw_exception
('txn_do called on $schema without storage');
$self->storage->txn_do(@_);
}
=head2 txn_scope_guard
Runs C<txn_scope_guard> on the schema's storage. See
L<DBIx::Class::Storage/txn_scope_guard>.
=cut
sub txn_scope_guard {
my $self = shift;
$self->storage or $self->throw_exception
('txn_scope_guard called on $schema without storage');
$self->storage->txn_scope_guard(@_);
}
=head2 txn_begin
Begins a transaction (does nothing if AutoCommit is off). Equivalent to
calling $schema->storage->txn_begin. See
L<DBIx::Class::Storage/"txn_begin"> for more information.
=cut
sub txn_begin {
my $self = shift;
$self->storage or $self->throw_exception
('txn_begin called on $schema without storage');
$self->storage->txn_begin;
}
=head2 txn_commit
Commits the current transaction. Equivalent to calling
$schema->storage->txn_commit. See L<DBIx::Class::Storage/"txn_commit">
for more information.
=cut
sub txn_commit {
my $self = shift;
$self->storage or $self->throw_exception
('txn_commit called on $schema without storage');
$self->storage->txn_commit;
}
=head2 txn_rollback
Rolls back the current transaction. Equivalent to calling
$schema->storage->txn_rollback. See
L<DBIx::Class::Storage/"txn_rollback"> for more information.
=cut
sub txn_rollback {
my $self = shift;
$self->storage or $self->throw_exception
('txn_rollback called on $schema without storage');
$self->storage->txn_rollback;
}
=head2 storage
my $storage = $schema->storage;
Returns the L<DBIx::Class::Storage> object for this Schema. Grab this
if you want to turn on SQL statement debugging at runtime, or set the
quote character. For the default storage, the documentation can be
found in L<DBIx::Class::Storage::DBI>.
=head2 populate
=over 4
=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>, [ \@column_list, \@row_values+ ] | [ \%col_data+ ]
=item Return Value: L<\@result_objects|DBIx::Class::Manual::ResultClass> (scalar context) | L<@result_objects|DBIx::Class::Manual::ResultClass> (list context)
=back
A convenience shortcut to L<DBIx::Class::ResultSet/populate>. Equivalent to:
$schema->resultset($source_name)->populate([...]);
=over 4
=item NOTE
The context of this method call has an important effect on what is
submitted to storage. In void context data is fed directly to fastpath
insertion routines provided by the underlying storage (most often
L<DBI/execute_for_fetch>), bypassing the L<new|DBIx::Class::Row/new> and
L<insert|DBIx::Class::Row/insert> calls on the
L<Result|DBIx::Class::Manual::ResultClass> class, including any
augmentation of these methods provided by components. For example if you
are using something like L<DBIx::Class::UUIDColumns> to create primary
keys for you, you will find that your PKs are empty. In this case you
will have to explicitly force scalar or list context in order to create
those values.
=back
=cut
sub populate {
my ($self, $name, $data) = @_;
my $rs = $self->resultset($name)
or $self->throw_exception("'$name' is not a resultset");
return $rs->populate($data);
}
=head2 connection
=over 4
=item Arguments: @args
=item Return Value: $new_schema
=back
Similar to L</connect> except sets the storage object and connection
data in-place on the Schema class. You should probably be calling
L</connect> to get a proper Schema object instead.
=head3 Overloading
Overload C<connection> to change the behaviour of C<connect>.
=cut
sub connection {
my ($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/^::/;
try {
$self->ensure_class_loaded ($storage_class);
}
catch {
$self->throw_exception(
"Unable to load storage class ${storage_class}: $_"
);
};
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: $target_namespace, $additional_base_class?
=item Return Value: $new_schema
=back
For each L<DBIx::Class::ResultSource> 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<DBIx::Class::ResultSource> object to the
new $schema object. If C<$additional_base_class> is given, the new composed
classes will inherit from first the corresponding class 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 $source_name ($schema->sources) {
# my $source = $schema->source($source_name);
# my $target_class = "${target}::${source_name}";
# $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');
# $schema->register_source($source_name, $source);
# }
# return $schema;
# }
sub compose_namespace {
my ($self, $target, $base) = @_;
my $schema = $self->clone;
$schema->source_registrations({});
# the original class-mappings must remain - otherwise
# reverse_relationship_info will not work
#$schema->class_mappings({});
{
no warnings qw/redefine/;
local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
use warnings qw/redefine/;
no strict qw/refs/;
foreach my $source_name ($self->sources) {
my $orig_source = $self->source($source_name);
my $target_class = "${target}::${source_name}";
$self->inject_base($target_class, $orig_source->result_class, ($base || ()) );
# register_source examines result_class, and then returns us a clone
my $new_source = $schema->register_source($source_name, bless
{ %$orig_source, result_class => $target_class },
ref $orig_source,
);
if ($target_class->can('result_source_instance')) {
# give the class a schema-less source copy
$target_class->result_source_instance( bless
{ %$new_source, schema => ref $new_source->{schema} || $new_source->{schema} },
ref $new_source,
);
}
}
foreach my $meth (qw/class source resultset/) {
no warnings 'redefine';
*{"${target}::${meth}"} = subname "${target}::${meth}" =>
sub { shift->schema->$meth(@_) };
}
}
Class::C3->reinitialize() if DBIx::Class::_ENV_::OLD_MRO;
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 $schema->storage->svp_begin. See
L<DBIx::Class::Storage/"svp_begin"> for more information.
=cut
sub svp_begin {
my ($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 $schema->storage->svp_release. See
L<DBIx::Class::Storage/"svp_release"> for more information.
=cut
sub svp_release {
my ($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 $schema->storage->svp_rollback. See
L<DBIx::Class::Storage/"svp_rollback"> for more information.
=cut
sub svp_rollback {
my ($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 Arguments: %attrs?
=item Return Value: $new_schema
=back
Clones the schema and its associated result_source objects and returns the
copy. The resulting copy will have the same attributes as the source schema,
except for those attributes explicitly overridden by the provided C<%attrs>.
=cut
sub clone {
my $self = shift;
my $clone = {
(ref $self ? %$self : ()),
(@_ == 1 && ref $_[0] eq 'HASH' ? %{ $_[0] } : @_),
};
bless $clone, (ref $self || $self);
$clone->$_(undef) for qw/class_mappings source_registrations storage/;
$clone->_copy_state_from($self);
return $clone;
}
# Needed in Schema::Loader - if you refactor, please make a compatibility shim
# -- Caelum
sub _copy_state_from {
my ($self, $from) = @_;
$self->class_mappings({ %{$from->class_mappings} });
$self->source_registrations({ %{$from->source_registrations} });
foreach my $source_name ($from->sources) {
my $source = $from->source($source_name);
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
$self->register_extra_source($source_name => $new);
}
if ($from->storage) {
$self->storage($from->storage);
$self->storage->set_schema($self);
}
}
=head2 throw_exception
=over 4
=item Arguments: $message
=back
Throws an exception. Obeys the exemption rules of L<DBIx::Class::Carp> to report
errors from outer-user's perspective. See L</exception_action> for details on overriding
this method's behavior. If L</stacktrace> is turned on, C<throw_exception>'s
default behavior will provide a detailed stack trace.
=cut
sub throw_exception {
my $self = shift;
if (my $act = $self->exception_action) {
if ($act->(@_)) {
DBIx::Class::Exception->throw(
"Invocation of the exception_action handler installed on $self did *not*"
.' result in an exception. DBIx::Class is unable to function without a reliable'
.' exception mechanism, ensure that exception_action does not hide exceptions'
." (original error: $_[0])"
);
}
carp_unique (
"The exception_action handler installed on $self returned false instead"
.' of throwing an exception. This behavior has been deprecated, adjust your'
.' handler to always rethrow the supplied error.'
);
}
DBIx::Class::Exception->throw($_[0], $self->stacktrace);
}
=head2 deploy
=over 4
=item Arguments: \%sqlt_args, $dir
=back
Attempts to deploy the schema to the current storage using L<SQL::Translator>.
See L<SQL::Translator/METHODS> for a list of values for C<\%sqlt_args>.
The most common value for this would be C<< { add_drop_table => 1 } >>
to have the SQL produced include a C<DROP TABLE> statement for each table
created. For quoting purposes supply C<quote_identifiers>.
Additionally, the DBIx::Class parser accepts a C<sources> parameter as a hash
ref or an array ref, containing a list of source to deploy. If present, then
only the sources listed will get deployed. Furthermore, you can use the
C<add_fk_index> parser parameter to prevent the parser from creating an index for each
FK.
=cut
sub deploy {
my ($self, $sqltargs, $dir) = @_;
$self->throw_exception("Can't deploy without storage") unless $self->storage;
$self->storage->deploy($self, undef, $sqltargs, $dir);
}
=head2 deployment_statements
=over 4
=item Arguments: See L<DBIx::Class::Storage::DBI/deployment_statements>
=item Return Value: $listofstatements
=back
A convenient shortcut to
C<< $self->storage->deployment_statements($self, @args) >>.
Returns the SQL statements used by L</deploy> and
L<DBIx::Class::Schema::Storage/deploy>.
=cut
sub deployment_statements {
my $self = shift;
$self->throw_exception("Can't generate deployment statements without a storage")
if not $self->storage;
$self->storage->deployment_statements($self, @_);
}
=head2 create_ddl_dir
=over 4
=item Arguments: See L<DBIx::Class::Storage::DBI/create_ddl_dir>
=back
A convenient shortcut to
C<< $self->storage->create_ddl_dir($self, @args) >>.
Creates an SQL file based on the Schema, for each of the specified
database types, in the given directory.
=cut
sub create_ddl_dir {
my $self = shift;
$self->throw_exception("Can't create_ddl_dir without storage") unless $self->storage;
$self->storage->create_ddl_dir($self, @_);
}
=head2 ddl_filename
=over 4
=item Arguments: $database-type, $version, $directory, $preversion
=item Return Value: $normalised_filename
=back
my $filename = $table->ddl_filename($type, $version, $dir, $preversion)
This method is called by C<create_ddl_dir> to compose a file name out of
the supplied directory, database type and version number. The default file
name format is: C<$dir$schema-$version-$type.sql>.
You may override this method in your schema if you wish to use a different
format.
WARNING
Prior to DBIx::Class version 0.08100 this method had a different signature:
my $filename = $table->ddl_filename($type, $dir, $version, $preversion)
In recent versions variables $dir and $version were reversed in order to
bring the signature in line with other Schema/Storage methods. If you
really need to maintain backward compatibility, you can do the following
in any overriding methods:
($dir, $version) = ($version, $dir) if ($DBIx::Class::VERSION < 0.08100);
=cut
sub ddl_filename {
my ($self, $type, $version, $dir, $preversion) = @_;
require File::Spec;
$version = "$preversion-$version" if $preversion;
my $class = blessed($self) || $self;
$class =~ s/::/-/g;
return File::Spec->catfile($dir, "$class-$version-$type.sql");
}
=head2 thaw
Provided as the recommended way of thawing schema objects. You can call
C<Storable::thaw> directly if you wish, but the thawed objects will not have a
reference to any schema, so are rather useless.
=cut
sub thaw {
my ($self, $obj) = @_;
local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
require Storable;
return Storable::thaw($obj);
}
=head2 freeze
This doesn't actually do anything more than call L<Storable/nfreeze>, it is just
provided here for symmetry.
=cut
sub freeze {
require Storable;
return Storable::nfreeze($_[1]);
}
=head2 dclone
=over 4
=item Arguments: $object
=item Return Value: dcloned $object
=back
Recommended way of dcloning L<DBIx::Class::Row> and L<DBIx::Class::ResultSet>
objects so their references to the schema object
(which itself is B<not> cloned) are properly maintained.
=cut
sub dclone {
my ($self, $obj) = @_;
local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
require Storable;
return Storable::dclone($obj);
}
=head2 schema_version
Returns the current schema class' $VERSION in a normalised way.
=cut
sub schema_version {
my ($self) = @_;
my $class = ref($self)||$self;
# does -not- use $schema->VERSION
# since that varies in results depending on if version.pm is installed, and if
# so the perl or XS versions. If you want this to change, bug the version.pm
# author to make vpp and vxs behave the same.
my $version;
{
no strict 'refs';
$version = ${"${class}::VERSION"};
}
return $version;
}
=head2 register_class
=over 4
=item Arguments: $source_name, $component_class
=back
This method is called by L</load_namespaces> and L</load_classes> 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:
$schema->register_source($source_name, $component_class->result_source_instance);
=cut
sub register_class {
my ($self, $source_name, $to_register) = @_;
$self->register_source($source_name => $to_register->result_source_instance);
}
=head2 register_source
=over 4
=item Arguments: $source_name, L<$result_source|DBIx::Class::ResultSource>
=back
This method is called by L</register_class>.
Registers the L<DBIx::Class::ResultSource> in the schema with the given
source name.
=cut
sub register_source { shift->_register_source(@_) }
=head2 unregister_source
=over 4
=item Arguments: $source_name
=back
Removes the L<DBIx::Class::ResultSource> from the schema for the given source name.
=cut
sub unregister_source { shift->_unregister_source(@_) }
=head2 register_extra_source
=over 4
=item Arguments: $source_name, L<$result_source|DBIx::Class::ResultSource>
=back
As L</register_source> 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 { shift->_register_source(@_, { extra => 1 }) }
sub _register_source {
my ($self, $source_name, $source, $params) = @_;
$source = $source->new({ %$source, source_name => $source_name });
$source->schema($self);
weaken $source->{schema} if ref($self);
my %reg = %{$self->source_registrations};
$reg{$source_name} = $source;
$self->source_registrations(\%reg);
return $source if $params->{extra};
my $rs_class = $source->result_class;
if ($rs_class and my $rsrc = try { $rs_class->result_source_instance } ) {
my %map = %{$self->class_mappings};
if (
exists $map{$rs_class}
and
$map{$rs_class} ne $source_name
and
$rsrc ne $_[2] # orig_source
) {
carp
"$rs_class already had a registered source which was replaced by this call. "
. 'Perhaps you wanted register_extra_source(), though it is more likely you did '
. 'something wrong.'
;
}
$map{$rs_class} = $source_name;
$self->class_mappings(\%map);
}
return $source;
}
my $global_phase_destroy;
sub DESTROY {
return if $global_phase_destroy ||= in_global_destruction;
my $self = shift;
my $srcs = $self->source_registrations;
for my $source_name (keys %$srcs) {
# find first source that is not about to be GCed (someone other than $self
# holds a reference to it) and reattach to it, weakening our own link
#
# during global destruction (if we have not yet bailed out) this should throw
# which will serve as a signal to not try doing anything else
# however beware - on older perls the exception seems randomly untrappable
# due to some weird race condition during thread joining :(((
if (ref $srcs->{$source_name} and svref_2object($srcs->{$source_name})->REFCNT > 1) {
local $@;
eval {
$srcs->{$source_name}->schema($self);
weaken $srcs->{$source_name};
1;
} or do {
$global_phase_destroy = 1;
};
last;
}
}
}
sub _unregister_source {
my ($self, $source_name) = @_;
my %reg = %{$self->source_registrations};
my $source = delete $reg{$source_name};
$self->source_registrations(\%reg);
if ($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<DBIx::Class::Schema/"compose_namespace"> to the target namespace,
calls L<DBIx::Class::Schema/connection> with @db_info on the new schema,
then injects the L<DBix::Class::ResultSetProxy> 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<DBIx::Class::Schema/connect> and use the resulting schema object to operate
on L<DBIx::Class::ResultSet> objects with L<DBIx::Class::Schema/resultset> for
more information.
=end hidden
=cut
sub compose_connection {
my ($self, $target, @info) = @_;
carp_once "compose_connection deprecated as of 0.08000"
unless $INC{"DBIx/Class/CDBICompat.pm"};
my $base = 'DBIx::Class::ResultSetProxy';
try {
eval "require ${base};"
}
catch {
$self->throw_exception
("No arguments to load_classes and couldn't load ${base} ($_)")
};
if ($self eq $target) {
# Pathological case, largely caused by the docs on early C::M::DBIC::Plain
foreach my $source_name ($self->sources) {
my $source = $self->source($source_name);
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 = subname $name, sub { $schema };
}
$schema->connection(@info);
foreach my $source_name ($schema->sources) {
my $source = $schema->source($source_name);
my $class = $source->result_class;
#warn "$source_name $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 AUTHOR AND CONTRIBUTORS
See L<AUTHOR|DBIx::Class/AUTHOR> and L<CONTRIBUTORS|DBIx::Class/CONTRIBUTORS> in DBIx::Class
=head1 LICENSE
You may distribute this code under the same terms as Perl itself.
=cut