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$self->{db}->{offer}->{product_id}->{name}

(($self->{db} || {})->{offer}||{})->{name}

$self->{db}->{users}->{ $user_id_1 }->limits->{ $user_id_2 };

eval{ $self->{$db}->{users}->{$user_id_1}->limits->{$user_id_2}; };