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package My::Schema;

...
#...

1;

CREATE TABLE a (u integer, PRIMARY KEY (u));
CREATE TABLE t (i integer, j integer, u integer, Primary key (i,j), co
+nstraint fkey1 foreign key (u) references a (u));
CREATE TABLE s (j integer, r1 integer, r2 integer, constraint fkey for
+eign key (r1,r2) references t (i,j));

  DB<2> x @relationships
0  HASH(0x261359c)
...
      'cond' => HASH(0x3bfdd8c)
         'foreign.u' => 'self.u'
      'source' => 'My::Schema::Result::A'