NAME

Nano - Object Persistence

ABSTRACT

Minimalist Object Persistence

SYNOPSIS

  package Person;

  use Moo;

  extends 'Nano::Node';

  has name => (
    is => 'ro',
    required => 1,
  );

  has friends => (
    is => 'ro',
    default => sub { People->new }
  );

  sub extroverted {
    my ($self) = @_;
    ($self->friends->count > 1) ? 1 : 0
  }

  sub introverted {
    my ($self) = @_;
    ($self->friends->count < 2) ? 1 : 0
  }

  package People;

  use Moo;

  extends 'Nano::Nodes';

  sub new_type {
    'Person'
  }

  sub extroverted {
    my ($self) = @_;

    $self->scope(sub {
      my ($person) = @_;
      $person->extroverted
    });
  }

  sub introverted {
    my ($self) = @_;

    $self->scope(sub {
      my ($person) = @_;
      $person->introverted
    });
  }

  package main;

  my $rachel = Person->new(
    id => 'rachel',
    name => 'rachel',
  );
  my $monica = Person->new(
    id => 'monica',
    name => 'monica',
  );
  my $phoebe = Person->new(
    id => 'phoebe',
    name => 'phoebe',
  );

  $rachel->friends->set($monica);
  $rachel->friends->set($phoebe);

  $monica->friends->set($rachel);
  $monica->friends->set($phoebe);

  $phoebe->friends->set($rachel);
  $phoebe->friends->set($monica);

  $rachel->save;
  $monica->save;
  $phoebe->save;

  $phoebe->friends->count; # 2
  $phoebe->friends->extroverted->count; # 2
  $phoebe->friends->introverted->count; # 0

  my $nano = Nano->new;

  my $friend = $nano->find('rachel');

DESCRIPTION

This package provides a minimalist framework for persisting objects (i.e. class instances) with as little effort as possible. This framework relies on the Zing toolkit which provides pluggable storage and serialization options.

LIBRARIES

This package uses type constraints from:

Nano::Types

ATTRIBUTES

This package has the following attributes:

env

  env(Env)

This attribute is read-only, accepts (Env) values, and is optional.

METHODS

This package implements the following methods:

dump

  dump(Object $object) : HashRef

The dump method returns a serialized hash representation for the object provided.

dump example #1
  my $nano = Nano->new;

  my $rachel = $nano->find('rachel');

  my $dump = $nano->dump($rachel);

find

  find(Str $name) : Node

The find method finds, inflates, and returns a prior persisted object for the ID provided.

find example #1
  my $nano = Nano->new;

  my $phoebe = $nano->find('phoebe');

hash

  hash(Str $name) : Str

The hash method returns a SHA-1 digest for the string provided.

hash example #1
  my $nano = Nano->new;

  my $email = 'me@example.com';

  $nano->hash($email);

keyval

  keyval(Str $name) : KeyVal

The keyval method returns a Zing::KeyVal object for the ID provided.

keyval example #1
  my $nano = Nano->new;

  my $keyval = $nano->keyval('rachel');

name

  name(Object $object) : Str

The name method returns the class name for the object provided.

name example #1
  my $nano = Nano->new;

  my $rachel = $nano->find('rachel');

  my $name = $nano->name($rachel);

object

  object(HashRef $object) : Object

The object method returns an object derived from a prior serialization representation.

object example #1
  my $nano = Nano->new;

  my $new_rachel = $nano->object({
    '$type' => 'node',
    '$name' => 'Person',
    '$data' => {
      'id' => 'rachel',
      'name' => 'rachel',
      'nano' => {
        '$skip' => 1
      },
      'friends' => {
        '$skip' => 1
      },
    },
  });

reify

  reify(Str $name, HashRef $data) : Object

The reify method constructs an object from the class name and data provided.

reify example #1
  my $nano = Nano->new;

  my $new_rachel = $nano->reify('Person', {
    id => 'rachel',
    name => 'rachel',
  });

table

  table(Str $name) : Table

The table method returns a Zing::Table object for the ID provided.

table example #1
  my $nano = Nano->new;

  my $rachel = $nano->find('rachel');

  my $table = $nano->table($rachel->friends->id);

AUTHOR

Al Newkirk, awncorp@cpan.org

LICENSE

Copyright (C) 2011-2019, Al Newkirk, et al.

This is free software; you can redistribute it and/or modify it under the terms of the The Apache License, Version 2.0, as elucidated in the "license file".

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