Hi, I am trying to use a hash of hashes in a package but can't quite figure out how to print all the hashes with an accessor.
I create the hash something like this:

sub init_hash {
  my ($self) = @_;
  $self->{a_hash}{item1} = {name => 'a', value => '1'};
  $self->{a_hash}{item2} = {name => 'b', value => '2'};
  $self->{a_hash}{item3} = {name => 'c', value => '3'};
  $self->{a_hash}{item4} = {name => 'd', value => '4'};
  1;
}
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So far so good, and now I can create an accessor to print one of the items from that hash like this:

sub print_item3 {
  my ($self) = @_;
  print $self->{a_hash}{item3}{name} . " : " . $self->{a_hash}{item3}{
+value} . "\n";
}
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This works and it prints the item, next I want to print the complete hash and so I try something like this:

sub print_all_hash {
  my ($self) = @_;
  foreach my $item (keys $self->{a_hash}) {
    print $self->{a_hash}{$item}{name} . " : " . $self->{a_hash}{$item
+}{value} . "\n";
  }
}
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But this doesn't work and throws an error:

Type of arg 1 to keys must be hash (not hash element)
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I have tried a number of variations but just can't get the syntax correct and so I am seeking a little help from you guys to put me on track.
Many thanks.