TORM

import { Torm, Model, field } from 'https://deno.land/x/torm/src/drivers/sqlite.ts'


class Book extends Model('book', {
  id:           field.number(),
  title:        field.string(),
  language:     field.string().default('english'),
  published_at: field.datetime().optional(),
}) {
  create = this.query`INSERT INTO book (title, language, published_at) VALUES (${[Book.params.title, Book.params.language, Book.params.published_at]})`.exec
  get = this.query`SELECT ${Book.result['*']} FROM book WHERE id = ${Book.params.id}`.one
}


class BookORM extends Torm {
  static migrations = { version: '1.0.0' }
  book = this.model(Book)
}

const db = new BookORM('books.db')
await db.init()
const info = db.book.create({ title: 'The Hobbit', published_at: new Date('September 21, 1937') })
const row = db.book.get({ id: info.last_insert_row_id })

console.log(row?.title, 'written in', row?.language, 'published on', row?.published_at)
// "The Hobbit written in english published on 1937-09-21T04:00:00.000Z"

import { Torm, Model, Migration, field } from 'https://deno.land/x/torm/src/drivers/sqlite.ts'

class Author extends Model('author', {
  id:           field.number(),
  name:         field.string(),
}) {
  create = this.query`INSERT INTO author (name) VALUES (${Author.params.name})`.exec
}

class Book extends Model('book', {
  id:           field.number(),
  title:        field.string(),
  language:     field.string().default('english'),
  published_at: field.datetime().optional(),
  author_id:    field.number().optional(),
}) {
  create = this.query`INSERT INTO book (title, language, published_at, author_id) VALUES (${[Book.params.title, Book.params.language, Book.params.published_at, Book.params.author_id]})`.exec
  get = this.query`SELECT ${Book.result['*']} FROM book WHERE id = ${Book.params.id}`.one
  set_author = this.query`UPDATE book SET author_id = ${Book.params.author_id} WHERE title = ${Book.params.title}`.exec
}

const InitializationMigration = Migration.create('1.1.0', `
  CREATE TABLE author (
    id INTEGER NOT NULL PRIMARY KEY,
    name TEXT NOT NULL
  );

  CREATE TABLE book (
    id INTEGER NOT NULL PRIMARY KEY,
    title TEXT NOT NULL,
    data TEXT,
    language TEXT NOT NULL,
    published_at TEXT,
    author_id INTEGER,
    FOREIGN KEY(author_id) REFERENCES author(id)
  )`)

// later on, we may add a author table
const AddAuthorIdColumnMigration = Migration.create('1.1.0', db => db.exec('ALTER TABLE book ADD COLUMN author_id TEXT REFERENCES author_id(id)'))

class BookORM extends Torm {
  static migrations = {
    version: '1.1.0',
    // an initialization migration is ran on init(), the first time the database is created
    initialization: InitializationMigration,
    // upgrades are ran when the connected database has an outdated version number
    // upgrades run in order of their semver versions.
    // The latest upgrade version _must_ match the version defined above
    upgrades: [AddAuthorIdColumnMigration],
  }

  book = this.model(Book)
  author = this.model(Author)
}

const db = new BookORM('books.db')
await db.init()
const info = db.author.create({ name: 'JR Tolkien' })
db.book.set_author({ title: 'The Hobbit', author_id: info.last_insert_row_id })

// As an example of how this can be used, this is a test where we can create a fresh database,
// and migrate an older database then we can compare that the two databases have identical table structures.
// This is a very useful sanity check when writing migrations
test('migration structure', async () => {
  const db_new = new BookORM('test/fixtures/migrations.db')
  await db_new.init()
  assert_equals('1.1.0', db_new.schemas.version())
  const tables_new = db_new.schemas.tables()

  const db_old = new BookORM('test/fixtures/migrations_1.0.0.db')
  await db_old.init()
  assert_equals('1.1.0', db_old.schemas.version())
  const tables_old = db_old.schemas.tables()
  assert_equals(tables_new, tables_old)
})