KiokuDB::Role::ID::Content - Content dependent object IDs

    package BLOB;
    use Moose;

    use Digest::SHA1;

    with qw(KiokuDB::Role::ID::Content);

    sub kiokudb_object_id {
        my $self = shift;
        sha1_hex($self->data);
    }

    has data => (
        isa => "Str",
        is  => "ro",
        required => 1,
    );

This is a role for KiokuDB::Role::Immutable objects whose IDs depend on their content, or in other words content addressable objects.

A canonical example is a string identified by its SHA-1 hash, as is demonstrated in the SYNOPSIS.

Objects which do this role are never updated in the database just like KiokuDB::Role::Immutable objects.

Additionally, it is not an error to insert such objects twice since the objects are assumed to be identical.