如何在 Sequelize 中使用 TypeScript

Question

我已經使用 Fastify 用 Node、PostgreSQL、Sequelize 編寫了我的服務器應用程序。

現在我想使用 TypeScript。 誰能告訴我如何開始使用 TypeScript 重寫我的服務器應用程序。

Answer 1

使用裝飾器是你應該盡可能避免的事情，它們不是 ECMAScript 標准。 他們甚至被視為遺產。 這就是為什么我要向您展示如何在打字稿中使用 sequelize。

我們只需要遵循文檔： https : //sequelize.org/v5/manual/typescript.html但因為它不是很清楚，或者至少對我來說。 我花了一段時間才明白。

那里說你需要安裝這棵樹的東西

 * @types/node
 * @types/validator // this one is not need it
 * @types/bluebird

npm i -D @types/node @types/bluebird

那么讓我們假設您的項目如下所示：

myProject
--src
----models
------index.ts
------user-model.ts
------other-model.ts
----controllers
----index.ts
--package.json

讓我們先創建用戶模型

`./src/models/user-model.ts`
import { BuildOptions, DataTypes, Model, Sequelize } from "sequelize";

export interface UserAttributes {
    id: number;
    name: string;
    email: string;
    createdAt?: Date;
    updatedAt?: Date;
}
export interface UserModel extends Model<UserAttributes>, UserAttributes {}
export class User extends Model<UserModel, UserAttributes> {}

export type UserStatic = typeof Model & {
    new (values?: object, options?: BuildOptions): UserModel;
};

export function UserFactory (sequelize: Sequelize): UserStatic {
    return <UserStatic>sequelize.define("users", {
        id: {
            type: DataTypes.INTEGER,
            autoIncrement: true,
            primaryKey: true,
        },
        email: {
            type: DataTypes.STRING,
            allowNull: false,
            unique: true,
        },
        name: {
            type: DataTypes.STRING,
            allowNull: false,
        },
        createdAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
        updatedAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
    });
}

現在只是為了播放箭頭讓我們創建 another-model.ts

`./src/models/another-model.ts`

import { BuildOptions, DataTypes, Model, Sequelize } from "sequelize";

export interface SkillsAttributes {
    id: number;
    skill: string;
    createdAt?: Date;
    updatedAt?: Date;
}
export interface SkillsModel extends Model<SkillsAttributes>, SkillsAttributes {}
export class Skills extends Model<SkillsModel, SkillsAttributes> {}

export type SkillsStatic = typeof Model & {
    new (values?: object, options?: BuildOptions): SkillsModel;
};

export function SkillsFactory (sequelize: Sequelize): SkillsStatic {
    return <SkillsStatic>sequelize.define("skills", {
        id: {
            type: DataTypes.INTEGER,
            autoIncrement: true,
            primaryKey: true,
        },
        skill: {
            type: DataTypes.STRING,
            allowNull: false,
            unique: true,
        },
        createdAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
        updatedAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
    });
}

我們的實體完成了。 現在數據庫連接。

打開./src/models/index.ts那里我們將放置 seqelize 實例

`./src/models/index.ts`

import * as sequelize from "sequelize";
import {userFactory} from "./user-model";
import {skillsFactory} from "./other-model";

export const dbConfig = new sequelize.Sequelize(
    (process.env.DB_NAME = "db-name"),
    (process.env.DB_USER = "db-user"),
    (process.env.DB_PASSWORD = "db-password"),
    {
        port: Number(process.env.DB_PORT) || 54320,
        host: process.env.DB_HOST || "localhost",
        dialect: "postgres",
        pool: {
            min: 0,
            max: 5,
            acquire: 30000,
            idle: 10000,
        },
    }
);

// SOMETHING VERY IMPORTANT them Factory functions expect a
// sequelize instance as parameter give them `dbConfig`

export const User = userFactory(dbConfig);
export const Skills = skillsFactory(dbConfig);

// Users have skills then lets create that relationship

User.hasMay(Skills);

// or instead of that, maybe many users have many skills
Skills.belongsToMany(Users, { through: "users_have_skills" });

// the skill is the limit!

在我們的 index.ts 添加，如果你只是想打開連接

  db.sequelize
        .authenticate()
        .then(() => logger.info("connected to db"))
        .catch(() => {
            throw "error";
        });

或者如果你想創建它們表

  db.sequelize
        .sync()
        .then(() => logger.info("connected to db"))
        .catch(() => {
            throw "error";
        });

有些像這樣

 
import * as bodyParser from "body-parser";
import * as express from "express";
import { dbConfig } from "./models";
import { routes } from "./routes";
import { logger } from "./utils/logger";
import { timeMiddleware } from "./utils/middlewares";

export function expressApp () {
    dbConfig
        .authenticate()
        .then(() => logger.info("connected to db"))
        .catch(() => {
            throw "error";
        });

    const app: Application = express();
    if (process.env.NODE_ENV === "production") {
        app.use(require("helmet")());
        app.use(require("compression")());
    } else {
        app.use(require("cors")());
    }

    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({ extended: true, limit: "5m" }));
    app.use(timeMiddleware);
    app.use("/", routes(db));

    return app;
}

再一次，天空是極限。 如果您這樣做，您將擁有自動完成功能的所有功能。 這里有一個例子： https : //github.com/EnetoJara/resume-app

Answer 2

使用續集打字稿。 將您的表和視圖轉換為擴展 Model 對象的類。

使用類中的注釋來定義您的表。

 import {Table, Column, Model, HasMany} from 'sequelize-typescript'; @Table class Person extends Model<Person> { @Column name: string; @Column birthday: Date; @HasMany(() => Hobby) hobbies: Hobby[]; }

通過創建對象創建到 DB 的連接：

const sequelize = new Sequelize(configuration...). 

然后將您的表注冊到此對象。

sequelize.add([Person])

如需進一步參考，請檢查此模塊。 續集打字稿