-package DBIx::Class::Relationship::BelongsTo;
+package # hide from PAUSE
+ DBIx::Class::Relationship::BelongsTo;
+
+# Documentation for these methods can be found in
+# DBIx::Class::Relationship
use strict;
use warnings;
+use DBIx::Class::_Util qw( dbic_internal_try dbic_internal_catch );
+use namespace::clean;
+
+our %_pod_inherit_config =
+ (
+ class_map => { 'DBIx::Class::Relationship::BelongsTo' => 'DBIx::Class::Relationship' }
+ );
sub belongs_to {
my ($class, $rel, $f_class, $cond, $attrs) = @_;
- eval "require $f_class";
- my %f_primaries;
- $f_primaries{$_} = 1 for eval { $f_class->primary_columns };
- my $f_loaded = !$@;
- # single key relationship
- if (not defined $cond) {
- $class->throw("Can't infer join condition for ${rel} on ${class}; unable to load ${f_class}") unless $f_loaded;
- my ($pri, $too_many) = keys %f_primaries;
- $class->throw("Can't infer join condition for ${rel} on ${class}; ${f_class} has multiple primary key") if $too_many;
- my $acc_type = ($class->has_column($rel)) ? 'filter' : 'single';
- $class->add_relationship($rel, $f_class,
- { "foreign.${pri}" => "self.${rel}" },
- { accessor => $acc_type, %{$attrs || {}} }
- );
+
+ # assume a foreign key constraint unless defined otherwise
+ $attrs->{is_foreign_key_constraint} = 1
+ if not exists $attrs->{is_foreign_key_constraint};
+ $attrs->{undef_on_null_fk} = 1
+ if not exists $attrs->{undef_on_null_fk};
+
+ # no join condition or just a column name
+ if (!ref $cond) {
+
+ my ($f_key, $guess);
+ if (defined $cond and length $cond) {
+ $f_key = $cond;
+ $guess = "caller specified foreign key '$f_key'";
+ }
+ else {
+ $f_key = $rel;
+ $guess = "using given relationship name '$rel' as foreign key column name";
+ }
+
+ $class->throw_exception(
+ "No such column '$f_key' declared yet on ${class} ($guess)"
+ ) unless $class->result_source->has_column($f_key);
+
+ $class->ensure_class_loaded($f_class);
+ my $f_rsrc = dbic_internal_try {
+ $f_class->result_source;
+ }
+ dbic_internal_catch {
+ $class->throw_exception(
+ "Foreign class '$f_class' does not seem to be a Result class "
+ . "(or it simply did not load entirely due to a circular relation chain): $_"
+ );
+ };
+
+ my $pri = $f_rsrc->_single_pri_col_or_die;
+
+ $cond = { "foreign.${pri}" => "self.${f_key}" };
+
}
- # multiple key relationship
+ # explicit join condition
else {
- my $cond_rel;
- for (keys %$cond) {
- if (m/\./) { # Explicit join condition
- $cond_rel = $cond;
- last;
+ if (ref $cond eq 'HASH') { # ARRAY is also valid
+ my $cond_rel;
+ # FIXME This loop is ridiculously incomplete and dangerous
+ # staving off changes until implmentation of the swindon consensus
+ for (keys %$cond) {
+ if (m/\./) { # Explicit join condition
+ $cond_rel = $cond;
+ last;
+ }
+ $cond_rel->{"foreign.$_"} = "self.".$cond->{$_};
}
- $cond_rel->{"foreign.$_"} = "self.".$cond->{$_};
+ $cond = $cond_rel;
}
- $class->add_relationship($rel, $f_class,
- $cond_rel,
- { accessor => 'single', %{$attrs || {}} }
- );
}
- return 1;
-}
-=head1 AUTHORS
+ my $acc_type = (
+ ref $cond eq 'HASH'
+ and
+ keys %$cond == 1
+ and
+ (keys %$cond)[0] =~ /^foreign\./
+ and
+ $class->result_source->has_column($rel)
+ ) ? 'filter' : 'single';
-Alexander Hartmaier <Alexander.Hartmaier@t-systems.at>
+ my $fk_columns = ($acc_type eq 'single' and ref $cond eq 'HASH')
+ ? { map { $_ =~ /^self\.(.+)/ ? ( $1 => 1 ) : () } (values %$cond ) }
+ : undef
+ ;
-Matt S. Trout <mst@shadowcatsystems.co.uk>
+ $class->add_relationship($rel, $f_class,
+ $cond,
+ {
+ is_depends_on => 1,
+ accessor => $acc_type,
+ $fk_columns ? ( fk_columns => $fk_columns ) : (),
+ %{$attrs || {}}
+ }
+ );
-=cut
+ return 1;
+}
1;