---
name: "KiokuDB::Role::ID::Content"
section: "3pm"
platform: "linux"
package: "libkiokudb-perl"
version: "0.57-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/KiokuDB::Role::ID::Content"
---

# KiokuDB::Role::ID::Content(3pm)

Content dependent object IDs

## NAME

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

## VERSION

version 0.57

## SYNOPSIS

```
    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,
    );
```

## DESCRIPTION

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.

## AUTHOR

Yuval Kogman \<nothingmuch@woobling.org\>

## COPYRIGHT AND LICENSE

This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.