=head2 hashref_pk( )
-Calls hashref_array and returns a reference to a hash containing the primary key. For each key the corresponding value is a reference to a hash of the resultset inflated by L<DBIx::Class::ResultClass::HashRefInflator>.
+Calls L</hashref_array( )> and returns a reference to a hash containing the primary key. For each key the corresponding value is a reference to a hash of the resultset inflated by L<DBIx::Class::ResultClass::HashRefInflator>.
my $hashref_pk = $schema->resultset('User')->search( { } )->hashref_pk;
print Dumper $hashref_pk