use Carp::Clan qw/^DBIx::Class/;
use aliased 'DBIx::Class::ResultSource::Table';
use aliased 'DBIx::Class::ResultClass::HashRefInflator';
+use String::TT qw(strip tt);
+use Scalar::Util qw(blessed);
use namespace::autoclean;
# how this works:
#
# deploying the postgres rules through SQLT may be a pain though.
-__PACKAGE__->mk_group_accessors(simple => qw(parent_source));
+__PACKAGE__->mk_group_accessors(simple => qw(parent_source additional_parents));
method new ($class: @args) {
my $new = $class->next::method(@args);
return $new;
}
+method add_additional_parent ($source) {
+ my ($our_pk, $their_pk) = map {
+ join('|',sort $_->primary_columns)
+ } ($self, $source);
+
+ confess "Can't attach additional parent ${\$source->name} - it has different PKs ($their_pk versus our $our_pk)"
+ unless $their_pk eq $our_pk;
+ $self->additional_parents([
+ @{$self->additional_parents||[]}, $source
+ ]);
+ $self->add_columns(
+ map {
+ $_ => # put the extra key first to default it
+ { originally_defined_in => $source->name, %{$source->column_info($_)}, },
+ } grep !$self->has_column($_), $source->columns
+ );
+ foreach my $rel ($source->relationships) {
+ my $rel_info = $source->relationship_info($rel);
+ $self->add_relationship(
+ $rel, $rel_info->{source}, $rel_info->{cond},
+ # extra key first to default it
+ {originally_defined_in => $source->name, %{$rel_info->{attrs}}},
+ );
+ }
+}
+
method schema (@args) {
my $ret = $self->next::method(@args);
if (@args) {
- $self->_attach_additional_sources;
+ if ($self->parent_source) {
+ my $schema = $self->schema;
+ my $parent_name = $self->parent_source->name;
+ my ($parent) =
+ grep { $_->name eq $parent_name }
+ map $schema->source($_), $schema->sources;
+ confess "Couldn't find attached source for parent $parent_name - did you use load_classes? This module is only compatible with load_namespaces"
+ unless $parent;
+ $self->parent_source($parent); # so our parent is the one in this schema
+ }
}
return $ret;
}
-method _attach_additional_sources () {
- my $raw_name = $self->_raw_source_name;
+method attach_additional_sources () {
+ my $raw_name = $self->raw_source_name;
my $schema = $self->schema;
# if the raw source is already present we can assume we're done
return if grep { $_ eq $raw_name } $schema->sources;
+
# our parent should've been registered already actually due to DBIC
# attaching subclass sources later in load_namespaces
+
my $parent;
if ($self->parent_source) {
my $parent_name = $self->parent_source->name;
map $schema->source($_), $schema->sources;
confess "Couldn't find attached source for parent $parent_name - did you use load_classes? This module is only compatible with load_namespaces"
unless $parent;
+ $self->parent_source($parent); # so our parent is the one in this schema
}
- my $table = Table->new({ name => '_'.$self->name });
- $table->add_columns(
- map { ($_ => { %{$self->column_info($_)} }) }
- grep { $self->column_info($_)->{originally_defined_in} eq $self->name }
- $self->columns
- );
+
+ # create the raw table source
+
+ my $table = Table->new({ name => $self->raw_table_name });
+
# we don't need to add the PK cols explicitly if we're the root table
- # since they already got added above
+ # since they'll get added below
+
+ my %pk_join;
+
if ($parent) {
- my %join;
foreach my $pri ($self->primary_columns) {
my %info = %{$self->column_info($pri)};
delete @info{qw(is_auto_increment sequence auto_nextval)};
$table->add_column($pri => \%info);
- $join{"foreign.${pri}"} = "self.${pri}";
+ $pk_join{"foreign.${pri}"} = "self.${pri}";
}
- $table->add_relationship('parent', $parent->source_name, \%join);
+ # have to use source name lookups rather than result class here
+ # because we don't actually have a result class on the raw sources
+ $table->add_relationship('parent', $parent->raw_source_name, \%pk_join);
+ $self->depends_on->{$parent->source_name} = 1;
}
+
+ foreach my $add (@{$self->additional_parents||[]}) {
+ $table->add_relationship(
+ 'parent_'.$add->name, $add->source_name, \%pk_join
+ );
+ $self->depends_on->{$add->source_name} = 1;
+ }
+
+ # add every column that's actually a concrete part of us
+
+ $table->add_columns(
+ map { ($_ => { %{$self->column_info($_)} }) }
+ grep { $self->column_info($_)->{originally_defined_in} eq $self->name }
+ $self->columns
+ );
$table->set_primary_key($self->primary_columns);
+
+ # we need to copy our rels to the raw object as well
+ # note that ->add_relationship on a source object doesn't create an
+ # accessor so we can leave that part in the attributes
+
+ # if the other side is a table then we need to copy any rels it has
+ # back to us, as well, so that they point at the raw table. if the
+ # other side is an MTI view then we need to create the rels to it to
+ # point at -its- raw table; we don't need to worry about backrels because
+ # it's going to run this method too (and its raw source might not exist
+ # yet so we can't, anyway)
+
+ foreach my $rel ($self->relationships) {
+ my $rel_info = $self->relationship_info($rel);
+
+ # if we got this from the superclass, -its- raw table will nail this.
+ # if we got it from an additional parent, it's its problem.
+ next unless $rel_info->{attrs}{originally_defined_in} eq $self->name;
+
+ my $f_source = $schema->source($rel_info->{source});
+
+ # __PACKAGE__ is correct here because subclasses should be caught
+
+ my $one_of_us = $f_source->isa(__PACKAGE__);
+
+ my $f_source_name = $f_source->${\
+ ($one_of_us ? 'raw_source_name' : 'source_name')
+ };
+
+ $table->add_relationship(
+ '_'.$rel, $f_source_name, @{$rel_info}{qw(cond attrs)}
+ );
+
+ unless ($one_of_us) {
+ my $reverse = do {
+ # we haven't been registered yet, so reverse_ cries
+ # XXX this is evil and will probably break eventually
+ local @{$schema->source_registrations}
+ {map $self->$_, qw(source_name result_class)}
+ = ($self, $self);
+ $self->reverse_relationship_info($rel);
+ };
+ foreach my $rev_rel (keys %$reverse) {
+ $f_source->add_relationship(
+ '_raw_'.$rev_rel, $raw_name, @{$reverse->{$rev_rel}}{qw(cond attrs)}
+ );
+ }
+ }
+ }
+
$schema->register_source($raw_name => $table);
}
return $self->next::method(@args);
}
-method _raw_source_name () {
+method raw_source_name () {
my $base = $self->source_name;
- confess "Can't generate raw source name when we don't have a source_name"
+ confess "Can't generate raw source name for ${\$self->name} when we don't have a source_name"
unless $base;
return 'Raw::'.$base;
}
+method raw_table_name () {
+ return '_'.$self->name;
+}
+
method add_columns (@args) {
my $ret = $self->next::method(@args);
$_->{originally_defined_in} ||= $self->name for values %{$self->_columns};
return $ret;
}
+method add_relationship ($name, $f_source, $cond, $attrs) {
+ $self->next::method(
+ $name, $f_source, $cond,
+ { originally_defined_in => $self->name, %{$attrs||{}}, }
+ );
+}
+
+BEGIN {
+
+ # helper routines, constructed as anon subs so autoclean nukes them
+
+ use signatures;
+
+ *argify = sub (@names) {
+ map '_'.$_, @names;
+ };
+
+ *qualify_with = sub ($source, @names) {
+ my $name = blessed($source) ? $source->name : $source;
+ map join('.', $name, $_), @names;
+ };
+
+ *body_cols = sub ($source) {
+ my %pk; @pk{$source->primary_columns} = ();
+ map +{ %{$source->column_info($_)}, name => $_ },
+ grep !exists $pk{$_}, $source->columns;
+ };
+
+ *pk_cols = sub ($source) {
+ map +{ %{$source->column_info($_)}, name => $_ },
+ $source->primary_columns;
+ };
+
+ *names_of = sub (@cols) { map $_->{name}, @cols };
+
+ *function_body = sub ($name, $args, $body_parts) {
+ my $arglist = join(
+ ', ',
+ map "_${\$_->{name}} ${\uc($_->{data_type})}",
+ @$args
+ );
+ my $body = join("\n", '', map " $_;", @$body_parts);
+ return strip tt q{
+ CREATE OR REPLACE FUNCTION [% name %]
+ ([% arglist %])
+ RETURNS VOID AS $function$
+ BEGIN
+ [%- body %]
+ END;
+ $function$ LANGUAGE plpgsql;
+ };
+ };
+}
+
+BEGIN {
+
+ use signatures;
+
+ *arg_hash = sub ($source) {
+ map +($_ => \(argify $_)), names_of body_cols $source;
+ };
+
+ *rule_body = sub ($on, $to, $oldlist, $newlist) {
+ my $arglist = join(', ',
+ (qualify_with 'OLD', names_of @$oldlist),
+ (qualify_with 'NEW', names_of @$newlist),
+ );
+ $to = $to->name if blessed($to);
+ return strip tt q{
+ CREATE RULE _[% to %]_[% on %]_rule AS
+ ON [% on | upper %] TO [% to %]
+ DO INSTEAD (
+ SELECT [% to %]_[% on %]([% arglist %])
+ );
+ };
+ };
+}
+
+method root_table () {
+ $self->parent_source
+ ? $self->parent_source->root_table
+ : $self->schema->source($self->raw_source_name)
+}
+
+method view_definition () {
+ my $schema = $self->schema;
+ confess "Can't generate view without connected schema, sorry"
+ unless $schema && $schema->storage;
+ my $sqla = $schema->storage->sql_maker;
+ my @sources = my $table = $self->schema->source($self->raw_source_name);
+ my $super_view = $self->parent_source;
+ push(@sources, $super_view) if defined($super_view);
+ my @body_cols = map body_cols($_), @sources;
+ my @pk_cols = pk_cols $self;
+
+ # SELECT statement
+
+ my $select = $sqla->select(
+ ($super_view
+ ? ([ # FROM _tbl _tbl
+ { $table->name => $table->name },
+ [ # JOIN view view
+ { $super_view->name => $super_view->name },
+ # ON _tbl.id = view.id
+ { map +(qualify_with($super_view, $_), qualify_with($table, $_)),
+ names_of @pk_cols }
+ ]
+ ])
+ : ($table->name)),
+ [ (qualify_with $table, names_of @pk_cols), names_of @body_cols ],
+ ).';';
+
+ my ($now, $next) = grep defined, $super_view, $table;
+
+ # INSERT function
+
+ # NOTE: this assumes a single PK col called id with a sequence somewhere
+ # but nothing else -should- so fixing this should make everything work
+ my $insert_func =
+ function_body
+ $self->name.'_insert',
+ \@body_cols,
+ [
+ $sqla->insert( # INSERT INTO _tbl (foo, ...) VALUES (_foo, ...)
+ $now->name,
+ { arg_hash $now },
+ ),
+ ($next
+ ? $sqla->insert( # INSERT INTO super_view (id, ...)
+ # VALUES (currval('_root_tbl_id_seq'), ...)
+ $next->name,
+ {
+ (arg_hash $next),
+ id => \"currval('${\$self->root_table->name}_id_seq')",
+ }
+ )
+ : ()
+ )
+ ];
+
+ # note - similar to arg_hash but not quite enough to share code sanely
+ my $pk_where = { # id = _id AND id2 = _id2 ...
+ map +($_ => \"= ${\argify $_}"), names_of @pk_cols
+ };
+
+ # UPDATE function
+
+ my $update_func =
+ function_body
+ $self->name.'_update',
+ [ @pk_cols, @body_cols ],
+ [ map $sqla->update(
+ $_->name, # UPDATE foo
+ { arg_hash $_ }, # SET a = _a
+ $pk_where,
+ ), @sources
+ ];
+
+ # DELETE function
+
+ my $delete_func =
+ function_body
+ $self->name.'_delete',
+ [ @pk_cols ],
+ [ map $sqla->delete($_->name, $pk_where), @sources ];
+
+ my @rules = (
+ (rule_body insert => $self, [], \@body_cols),
+ (rule_body update => $self, \@pk_cols, \@body_cols),
+ (rule_body delete => $self, \@pk_cols, []),
+ );
+ return join("\n\n", $select, $insert_func, $update_func, $delete_func, @rules);
+}
+
1;
projects / dbsrgits/DBIx-Class-ResultSource-MultipleTableInheritance.git / blobdiff