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 $self->result_class->result_source_instance
17 # if present to get the superclass' source object
19 # When attached to a schema, we need to add sources to that schema with
20 # appropriate relationships for the foreign keys so the concrete tables
23 # We also generate our own view definition using this class' concrete table
24 # and the view for the superclass, and stored procedures for the insert,
25 # update and delete operations on this view.
27 # deploying the postgres rules through SQLT may be a pain though.
29 __PACKAGE__->mk_group_accessors(simple => qw(parent_source additional_parents));
31 method new ($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 add_additional_parent ($source) {
45 my ($our_pk, $their_pk) = map {
46 join('|',sort $_->primary_columns)
49 confess "Can't attach additional parent ${\$source->name} - it has different PKs ($their_pk versus our $our_pk)"
50 unless $their_pk eq $our_pk;
51 $self->additional_parents([
52 @{$self->additional_parents||[]}, $source
56 $_ => # put the extra key first to default it
57 { originally_defined_in => $source->name, %{$source->column_info($_)}, },
58 } grep !$self->has_column($_), $source->columns
60 foreach my $rel ($source->relationships) {
61 my $rel_info = $source->relationship_info($rel);
62 $self->add_relationship(
63 $rel, $rel_info->{source}, $rel_info->{cond},
64 # extra key first to default it
65 {originally_defined_in => $source->name, %{$rel_info->{attrs}}},
69 push(@{$self->result_class.'::ISA'}, $source->result_class);
73 method _source_by_name ($name) {
74 my $schema = $self->schema;
76 grep { $_->name eq $name }
77 map $schema->source($_), $schema->sources;
78 confess "Couldn't find attached source for parent $name - did you use load_classes? This module is only compatible with load_namespaces"
83 method schema (@args) {
84 my $ret = $self->next::method(@args);
86 if ($self->parent_source) {
87 my $parent_name = $self->parent_source->name;
88 $self->parent_source($self->_source_by_name($parent_name));
90 $self->additional_parents([
91 map { $self->_source_by_name($_->name) }
92 @{$self->additional_parents||[]}
98 method attach_additional_sources () {
99 my $raw_name = $self->raw_source_name;
100 my $schema = $self->schema;
102 # if the raw source is already present we can assume we're done
103 return if grep { $_ eq $raw_name } $schema->sources;
105 # our parent should've been registered already actually due to DBIC
106 # attaching subclass sources later in load_namespaces
109 if ($self->parent_source) {
110 my $parent_name = $self->parent_source->name;
112 grep { $_->name eq $parent_name }
113 map $schema->source($_), $schema->sources;
114 confess "Couldn't find attached source for parent $parent_name - did you use load_classes? This module is only compatible with load_namespaces"
116 $self->parent_source($parent); # so our parent is the one in this schema
119 # create the raw table source
121 my $table = Table->new({ name => $self->raw_table_name });
123 # we don't need to add the PK cols explicitly if we're the root table
124 # since they'll get added below
129 foreach my $pri ($self->primary_columns) {
130 my %info = %{$self->column_info($pri)};
131 delete @info{qw(is_auto_increment sequence auto_nextval)};
132 $table->add_column($pri => \%info);
133 $pk_join{"foreign.${pri}"} = "self.${pri}";
135 # have to use source name lookups rather than result class here
136 # because we don't actually have a result class on the raw sources
137 $table->add_relationship('parent', $parent->raw_source_name, \%pk_join);
138 $self->depends_on->{$parent->source_name} = 1;
141 foreach my $add (@{$self->additional_parents||[]}) {
142 $table->add_relationship(
143 'parent_'.$add->name, $add->source_name, \%pk_join
145 $self->depends_on->{$add->source_name} = 1;
148 # add every column that's actually a concrete part of us
151 map { ($_ => { %{$self->column_info($_)} }) }
152 grep { $self->column_info($_)->{originally_defined_in} eq $self->name }
155 $table->set_primary_key($self->primary_columns);
157 # we need to copy our rels to the raw object as well
158 # note that ->add_relationship on a source object doesn't create an
159 # accessor so we can leave that part in the attributes
161 # if the other side is a table then we need to copy any rels it has
162 # back to us, as well, so that they point at the raw table. if the
163 # other side is an MTI view then we need to create the rels to it to
164 # point at -its- raw table; we don't need to worry about backrels because
165 # it's going to run this method too (and its raw source might not exist
166 # yet so we can't, anyway)
168 foreach my $rel ($self->relationships) {
169 my $rel_info = $self->relationship_info($rel);
171 # if we got this from the superclass, -its- raw table will nail this.
172 # if we got it from an additional parent, it's its problem.
173 next unless $rel_info->{attrs}{originally_defined_in} eq $self->name;
175 my $f_source = $schema->source($rel_info->{source});
177 # __PACKAGE__ is correct here because subclasses should be caught
179 my $one_of_us = $f_source->isa(__PACKAGE__);
181 my $f_source_name = $f_source->${\
182 ($one_of_us ? 'raw_source_name' : 'source_name')
185 $table->add_relationship(
186 '_'.$rel, $f_source_name, @{$rel_info}{qw(cond attrs)}
189 unless ($one_of_us) {
191 # we haven't been registered yet, so reverse_ cries
192 # XXX this is evil and will probably break eventually
193 local @{$schema->source_registrations}
194 {map $self->$_, qw(source_name result_class)}
196 $self->reverse_relationship_info($rel);
198 foreach my $rev_rel (keys %$reverse) {
199 $f_source->add_relationship(
200 '_raw_'.$rev_rel, $raw_name, @{$reverse->{$rev_rel}}{qw(cond attrs)}
206 $schema->register_source($raw_name => $table);
209 method set_primary_key (@args) {
210 if ($self->parent_source) {
211 confess "Can't set primary key on a subclass";
213 return $self->next::method(@args);
216 method raw_source_name () {
217 my $base = $self->source_name;
218 confess "Can't generate raw source name for ${\$self->name} when we don't have a source_name"
220 return 'Raw::'.$base;
223 method raw_table_name () {
224 return '_'.$self->name;
227 method add_columns (@args) {
228 my $ret = $self->next::method(@args);
229 $_->{originally_defined_in} ||= $self->name for values %{$self->_columns};
233 method add_relationship ($name, $f_source, $cond, $attrs) {
235 $name, $f_source, $cond,
236 { originally_defined_in => $self->name, %{$attrs||{}}, }
242 # helper routines, constructed as anon subs so autoclean nukes them
246 *argify = sub (@names) {
250 *qualify_with = sub ($source, @names) {
251 my $name = blessed($source) ? $source->name : $source;
252 map join('.', $name, $_), @names;
255 *body_cols = sub ($source) {
256 my %pk; @pk{$source->primary_columns} = ();
257 map +{ %{$source->column_info($_)}, name => $_ },
258 grep !exists $pk{$_}, $source->columns;
261 *pk_cols = sub ($source) {
262 map +{ %{$source->column_info($_)}, name => $_ },
263 $source->primary_columns;
266 *names_of = sub (@cols) { map $_->{name}, @cols };
268 *function_body = sub ($name, $args, $body_parts) {
271 map "_${\$_->{name}} ${\uc($_->{data_type})}",
274 my $body = join("\n", '', map " $_;", @$body_parts);
276 CREATE OR REPLACE FUNCTION [% name %]
278 RETURNS VOID AS $function$
282 $function$ LANGUAGE plpgsql;
291 *arg_hash = sub ($source) {
292 map +($_ => \(argify $_)), names_of body_cols $source;
295 *rule_body = sub ($on, $to, $oldlist, $newlist) {
296 my $arglist = join(', ',
297 (qualify_with 'OLD', names_of @$oldlist),
298 (qualify_with 'NEW', names_of @$newlist),
300 $to = $to->name if blessed($to);
302 CREATE RULE _[% to %]_[% on %]_rule AS
303 ON [% on | upper %] TO [% to %]
305 SELECT [% to %]_[% on %]([% arglist %])
311 method root_table () {
313 ? $self->parent_source->root_table
314 : $self->schema->source($self->raw_source_name)
317 method view_definition () {
318 my $schema = $self->schema;
319 confess "Can't generate view without connected schema, sorry"
320 unless $schema && $schema->storage;
321 my $sqla = $schema->storage->sql_maker;
322 my $table = $self->schema->source($self->raw_source_name);
323 my $super_view = $self->parent_source;
324 my @all_parents = my @other_parents = @{$self->additional_parents||[]};
325 push(@all_parents, $super_view) if defined($super_view);
326 my @sources = ($table, @all_parents);
327 my @body_cols = map body_cols($_), @sources;
328 my @pk_cols = pk_cols $self;
332 my $am_root = !($super_view || @other_parents);
334 my $select = $sqla->select(
337 : ([ # FROM _tbl _tbl
338 { $table->name => $table->name },
342 { $parent->name => $parent->name },
343 # ON _tbl.id = view.id
344 { map +(qualify_with($parent, $_), qualify_with($table, $_)),
350 [ (qualify_with $table, names_of @pk_cols), names_of @body_cols ],
353 my ($now, @next) = grep defined, $super_view, $table, @other_parents;
357 # NOTE: this assumes a single PK col called id with a sequence somewhere
358 # but nothing else -should- so fixing this should make everything work
361 $self->name.'_insert',
364 $sqla->insert( # INSERT INTO tbl/super_view (foo, ...) VALUES (_foo, ...)
369 $sqla->insert( # INSERT INTO parent (id, ...)
370 # VALUES (currval('_root_tbl_id_seq'), ...)
374 id => \"currval('${\$self->root_table->name}_id_seq')",
380 # note - similar to arg_hash but not quite enough to share code sanely
381 my $pk_where = { # id = _id AND id2 = _id2 ...
382 map +($_ => \"= ${\argify $_}"), names_of @pk_cols
389 $self->name.'_update',
390 [ @pk_cols, @body_cols ],
392 $_->name, # UPDATE foo
393 { arg_hash $_ }, # SET a = _a
402 $self->name.'_delete',
404 [ map $sqla->delete($_->name, $pk_where), @sources ];
407 (rule_body insert => $self, [], \@body_cols),
408 (rule_body update => $self, \@pk_cols, \@body_cols),
409 (rule_body delete => $self, \@pk_cols, []),
411 return join("\n\n", $select, $insert_func, $update_func, $delete_func, @rules);