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Another working relationship sample
Fernando Correa de Oliveira edited this page Oct 2, 2018
·
11 revisions
use lib "lib";
use Red;
model Person {...}
model Post is rw {
has Int $.id is serial;
has Int $!author-id is referencing{ Person.id };
has Str $.title is column{ :unique };
has Str $.body is column;
has Person $.author is relationship{ .author-id };
has Bool $.deleted is column = False;
method delete { $!deleted = True; self.^save }
}
model Person is rw {
has Int $.id is serial;
has Str $.name is column;
has Post @.posts is relationship{ .author-id };
method active-posts { @!posts.grep: not *.deleted }
}
my $*RED-DEBUG = True;
my $*RED-DB = database "SQLite";
Person.^create-table;
Post.^create-table;
my $p = Person.^create: :name<Fernando>;
my $post = $p.posts.create: :title<Bla>, :body<BlaBle1>;
$p.posts.create: :title<Ble>, :body<BlaBle2>;
say $p.posts.map: *.title;
$post.delete;
say $p.active-posts.map: *.id;
SQL : CREATE TABLE person(
id integer NOT NULL primary key autoincrement,
name varchar(255) NULL
)
SQL : CREATE TABLE post(
body varchar(255) NULL,
id integer NOT NULL primary key autoincrement,
author_id integer NULL references person(id),
deleted integer NULL,
title varchar(255) NULL
)
SQL : INSERT INTO person(
name
)
VALUES(
'Fernando'
)
SQL : SELECT
id , name
FROM
person
WHERE
id = last_insert_rowid()
LIMIT 1
SQL : INSERT INTO post(
author_id,
title,
body,
deleted
)
VALUES(
1,
'Bla',
'BlaBle1',
0
)
SQL : SELECT
body , id , author_id as "author-id", deleted , title
FROM
post
WHERE
id = last_insert_rowid()
LIMIT 1
SQL : INSERT INTO post(
title,
deleted,
body,
author_id
)
VALUES(
'Ble',
0,
'BlaBle2',
1
)
SQL : SELECT
body , id , author_id as "author-id", deleted , title
FROM
post
WHERE
id = last_insert_rowid()
LIMIT 1
SQL : SELECT
title as "data"
FROM
post
WHERE
author_id = 1
(Bla Ble)
SQL : UPDATE post SET
deleted = 1
WHERE id = 1
SQL : SELECT
id as "data"
FROM
post
WHERE
author_id = 1 AND (deleted == 0 OR deleted IS NULL)
(2)