sequelize-typescript-migration-lts

Idea: founded the best changes at each 27th fork from the main repository and merge them together.

• Use it from here by the name of sequelize-typescript-migration-lts

• Here is the Github discussion, any ideas/improves are very welcome.

Tutorial

youtube video

Installation

1npm i sequelize-typescript-migration-lts
2// Or
3yarn add sequelize-typescript-migration-lts

Thanks kimjbstar, mricharz, syon-development, viinzzz and lou2013 for the awesome lib.

General info

It is based on sequelize-typescript, not supports "sequelize" based model codes. and you need prior knowledge of migration of Sequelize.

Sequelize Migration Manual

This scans models and its decorators to find changes, and generates migration code with this changes so don't need to write up, down function manually. this is like "makemigration" in django framework.

After generate successfully, you can use "migrate" in Sequelize Sequelize Migration Manual

This refers to GitHub - flexxnn/sequelize-auto-migrations: Migration generator && runner for sequelize and its forks, and modified to typescript.

Sometimes, undo(down) action may not work, then you should modify manually. Maybe it's because of ordering of relations of models. That issue is currently in the works.

Compatibility

• Use version ~2.0.0 for sequelize@~6.0.0
• Use version ~1.0.0 for sequelize@~4.0.0

Usage Example

1import { join } from 'path'
2import { Sequelize } from "sequelize-typescript";
3import { SequelizeTypescriptMigration } from "sequelize-typescript-migration-lts";
4
5const sequelize: Sequelize = new Sequelize({
6  // .. options
7});
8
9await SequelizeTypescriptMigration.makeMigration(sequelize, {
10  outDir: join(__dirname, './migrations'),
11  migrationName: "add-awesome-field-in-my-table",
12  preview: false,
13});

let's see example, if you have this two models and run first makeMigration, it detects all table change from nothing.

1@Table
2export class CarBrand extends Model<CarBrand> {
3  @Column
4  name: string;
5
6  @Default(true)
7  @Column(DataType.BOOLEAN)
8  isCertified: boolean;
9
10  @Column
11  imgUrl: string;
12
13  @Column
14  orderNo: number;
15
16  @Column
17  carsCount: number;
18}

1@Table
2export class Car extends Model<Car> {
3  @Column
4  name: string;
5
6  @ForeignKey(() => CarBrand)
7  @Column
8  carBrandId: number;
9
10  @BelongsTo(() => CarBrand)
11  carBrand: CarBrand;
12}

then this code written to 00000001-noname.js in migrations path.

1"use strict";
2
3var Sequelize = require("sequelize");
4
5/**
6 * Actions summary:
7 *
8 * createTable "CarBrands", deps: []
9 * createTable "Cars", deps: [CarBrands]
10 *
11 **/
12
13var info = {
14  revision: 1,
15  name: "noname",
16  created: "2020-04-12T15:49:58.814Z",
17  comment: "",
18};
19
20var migrationCommands = [
21  {
22    fn: "createTable",
23    params: [
24      "CarBrands",
25      {
26        id: {
27          autoIncrement: true,
28          primaryKey: true,
29          allowNull: false,
30          type: Sequelize.INTEGER,
31        },
32        name: {
33          type: Sequelize.STRING,
34        },
35        isCertified: {
36          type: Sequelize.BOOLEAN,
37        },
38        imgUrl: {
39          type: Sequelize.STRING,
40        },
41        orderNo: {
42          type: Sequelize.INTEGER,
43        },
44        carsCount: {
45          type: Sequelize.INTEGER,
46        },
47        createdAt: {
48          allowNull: false,
49          type: Sequelize.DATE,
50        },
51        updatedAt: {
52          allowNull: false,
53          type: Sequelize.DATE,
54        },
55      },
56      {},
57    ],
58  },
59
60  {
61    fn: "createTable",
62    params: [
63      "Cars",
64      {
65        id: {
66          autoIncrement: true,
67          primaryKey: true,
68          allowNull: false,
69          type: Sequelize.INTEGER,
70        },
71        name: {
72          type: Sequelize.STRING,
73        },
74        carBrandId: {
75          onDelete: "NO ACTION",
76          onUpdate: "CASCADE",
77          references: {
78            model: "CarBrands",
79            key: "id",
80          },
81          allowNull: true,
82          type: Sequelize.INTEGER,
83        },
84        createdAt: {
85          allowNull: false,
86          type: Sequelize.DATE,
87        },
88        updatedAt: {
89          allowNull: false,
90          type: Sequelize.DATE,
91        },
92      },
93      {},
94    ],
95  },
96];
97
98var rollbackCommands = [
99  {
100    fn: "dropTable",
101    params: ["Cars"],
102  },
103  {
104    fn: "dropTable",
105    params: ["CarBrands"],
106  },
107];
108
109module.exports = {
110  pos: 0,
111  up: function (queryInterface, Sequelize) {
112    var index = this.pos;
113    return new Promise(function (resolve, reject) {
114      function next() {
115        if (index < migrationCommands.length) {
116          let command = migrationCommands[index];
117          console.log("[#" + index + "] execute: " + command.fn);
118          index++;
119          queryInterface[command.fn]
120            .apply(queryInterface, command.params)
121            .then(next, reject);
122        } else resolve();
123      }
124      next();
125    });
126  },
127  down: function (queryInterface, Sequelize) {
128    var index = this.pos;
129    return new Promise(function (resolve, reject) {
130      function next() {
131        if (index < rollbackCommands.length) {
132          let command = rollbackCommands[index];
133          console.log("[#" + index + "] execute: " + command.fn);
134          index++;
135          queryInterface[command.fn]
136            .apply(queryInterface, command.params)
137            .then(next, reject);
138        } else resolve();
139      }
140      next();
141    });
142  },
143  info: info,
144};

then you can apply this npx sequelize db:migrate --to 00000001-noname.js

Possible Usage Scenario

Make sure to have writeMigration in your System under development and that sequelize is all set up

If you change a model and re-run the backend there should be a new file under db/migrations, but the database won't update automatically. There are easy but important steps:

1. Rename the file's name as well as the content (Info: name), so that everyone knows what this migration is about
2. Migrate your database sequelize db:migrate
3. Re-Serve the backend. You Should see 'No changes found'.
4. Test the automatically created file's down function sequelize db:migrate:undo
5. If there are any troubles, fix the auto-generated file (ordering!)
6. Run sequelize db:migrate:undo and continue your amazing work

Documentation

Will be ready soon!

Contributors

• MohammadMojtaba Roshani
• Anthony Luzquiños
• Alexandr Cherednichenko