1 package DBIx::Class::ResultSource::MultipleTableInheritance;
5 use parent qw(DBIx::Class::ResultSource::View);
6 use Method::Signatures::Simple;
7 use Carp::Clan qw/^DBIx::Class/;
8 use aliased 'DBIx::Class::ResultSource::Table';
9 use aliased 'DBIx::Class::ResultClass::HashRefInflator';
10 use String::TT qw(strip tt);
11 use Scalar::Util qw(blessed);
12 use namespace::autoclean;
16 # On construction, we hook $self->result_class->result_source_instance
17 # if present to get the superclass' source object
19 # When attached to a schema, we need to add sources to that schema with
20 # appropriate relationships for the foreign keys so the concrete tables
23 # We also generate our own view definition using this class' concrete table
24 # and the view for the superclass, and stored procedures for the insert,
25 # update and delete operations on this view.
27 # deploying the postgres rules through SQLT may be a pain though.
29 __PACKAGE__->mk_group_accessors(simple => qw(parent_source));
31 method new ($class: @args) {
32 my $new = $class->next::method(@args);
33 my $rc = $new->result_class;
34 if (my $meth = $rc->can('result_source_instance')) {
35 my $source = $rc->$meth;
36 if ($source->result_class ne $new->result_class
37 && $new->result_class->isa($source->result_class)) {
38 $new->parent_source($source);
44 method schema (@args) {
45 my $ret = $self->next::method(@args);
47 $self->_attach_additional_sources;
52 method _attach_additional_sources () {
53 my $raw_name = $self->raw_source_name;
54 my $schema = $self->schema;
56 # if the raw source is already present we can assume we're done
57 return if grep { $_ eq $raw_name } $schema->sources;
59 # our parent should've been registered already actually due to DBIC
60 # attaching subclass sources later in load_namespaces
63 if ($self->parent_source) {
64 my $parent_name = $self->parent_source->name;
66 grep { $_->name eq $parent_name }
67 map $schema->source($_), $schema->sources;
68 confess "Couldn't find attached source for parent $parent_name - did you use load_classes? This module is only compatible with load_namespaces"
70 $self->parent_source($parent); # so our parent is the one in this schema
73 # create the raw table source
75 my $table = Table->new({ name => $self->raw_table_name });
77 # we don't need to add the PK cols explicitly if we're the root table
78 # since they'll get added below
82 foreach my $pri ($self->primary_columns) {
83 my %info = %{$self->column_info($pri)};
84 delete @info{qw(is_auto_increment sequence auto_nextval)};
85 $table->add_column($pri => \%info);
86 $join{"foreign.${pri}"} = "self.${pri}";
88 # have to use source name lookups rather than result class here
89 # because we don't actually have a result class on the raw sources
90 $table->add_relationship('parent', $parent->raw_source_name, \%join);
93 # add every column that's actually a concrete part of us
96 map { ($_ => { %{$self->column_info($_)} }) }
97 grep { $self->column_info($_)->{originally_defined_in} eq $self->name }
100 $table->set_primary_key($self->primary_columns);
101 $schema->register_source($raw_name => $table);
104 method set_primary_key (@args) {
105 if ($self->parent_source) {
106 confess "Can't set primary key on a subclass";
108 return $self->next::method(@args);
111 method raw_source_name () {
112 my $base = $self->source_name;
113 confess "Can't generate raw source name for ${\$self->name} when we don't have a source_name"
115 return 'Raw::'.$base;
118 method raw_table_name () {
119 return '_'.$self->name;
122 method add_columns (@args) {
123 my $ret = $self->next::method(@args);
124 $_->{originally_defined_in} ||= $self->name for values %{$self->_columns};
130 # helper routines, constructed as anon subs so autoclean nukes them
134 *argify = sub (@names) {
138 *qualify_with = sub ($source, @names) {
139 my $name = blessed($source) ? $source->name : $source;
140 map join('.', $name, $_), @names;
143 *body_cols = sub ($source) {
144 my %pk; @pk{$source->primary_columns} = ();
145 map +{ %{$source->column_info($_)}, name => $_ },
146 grep !exists $pk{$_}, $source->columns;
149 *pk_cols = sub ($source) {
150 map +{ %{$source->column_info($_)}, name => $_ },
151 $source->primary_columns;
154 *names_of = sub (@cols) { map $_->{name}, @cols };
156 *function_body = sub ($name, $args, $body_parts) {
159 map '_'.join(' ', @{$_}{qw(name data_type)}),
162 my $body = join("\n", '', map " $_;", @$body_parts);
164 CREATE OR REPLACE FUNCTION [% name %]
166 RETURNS VOID AS $function$
170 $function$ LANGUAGE plpgsql;
179 *arg_hash = sub ($source) {
180 map +($_ => \(argify $_)), names_of body_cols $source;
183 *rule_body = sub ($on, $to, $oldlist, $newlist) {
184 my $arglist = join(', ',
185 (qualify_with 'OLD', names_of @$oldlist),
186 (qualify_with 'NEW', names_of @$newlist),
188 $to = $to->name if blessed($to);
190 CREATE RULE _[% to %]_[% on %]_rule AS
191 ON [% on | upper %] TO [% to %]
193 SELECT _[% to %]_[% on %]([% arglist %])
199 method root_table () {
201 ? $self->parent_source->root_table
202 : $self->schema->source($self->raw_source_name)
205 method view_definition () {
206 my $schema = $self->schema;
207 confess "Can't generate view without connected schema, sorry"
208 unless $schema && $schema->storage;
209 my $sqla = $schema->storage->sql_maker;
210 my @sources = my $table = $self->schema->source($self->raw_source_name);
211 my $super_view = $self->parent_source;
212 push(@sources, $super_view) if defined($super_view);
213 my @body_cols = map body_cols($_), @sources;
214 my @pk_cols = pk_cols $self;
218 my $select = $sqla->select(
220 ? ([ # FROM _tbl _tbl
221 { $table->name => $table->name },
223 { $super_view->name => $super_view->name },
224 # ON _tbl.id = view.id
225 { map +(qualify_with($super_view, $_), qualify_with($table, $_)),
230 [ (qualify_with $table, names_of @pk_cols), names_of @body_cols ],
233 my ($now, $next) = grep defined, $super_view, $table;
237 # NOTE: this assumes a single PK col called id with a sequence somewhere
238 # but nothing else -should- so fixing this should make everything work
241 $self->name.'_insert',
244 $sqla->insert( # INSERT INTO _tbl (foo, ...) VALUES (_foo, ...)
249 ? $sqla->insert( # INSERT INTO super_view (id, ...)
250 # VALUES (currval('_root_tbl_id_seq'), ...)
254 id => \"currval('${\$self->root_table->name}_id_seq')",
261 # note - similar to arg_hash but not quite enough to share code sanely
262 my $pk_where = { # id = _id AND id2 = _id2 ...
263 map +($_ => \"= ${\argify $_}"), names_of @pk_cols
270 $self->name.'_update',
271 [ @pk_cols, @body_cols ],
273 $_->name, # UPDATE foo
274 { arg_hash $_ }, # SET a = _a
283 $self->name.'_delete',
285 [ map $sqla->delete($_->name, $pk_where), @sources ];
288 (rule_body insert => $self, [], \@body_cols),
289 (rule_body update => $self, \@pk_cols, \@body_cols),
290 (rule_body delete => $self, \@pk_cols, []),
292 return join("\n\n", $select, $insert_func, $update_func, $delete_func, @rules);