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ModelInit.ts
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ModelInit.ts
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/**
* Keep this file in sync with the code in the "Usage" section in typescript.md
*/
import {
Association, DataTypes, HasManyAddAssociationMixin, HasManyCountAssociationsMixin,
HasManyCreateAssociationMixin, HasManyGetAssociationsMixin, HasManyHasAssociationMixin, Model,
ModelDefined, Optional, Sequelize
} from "sequelize";
const sequelize = new Sequelize("mysql://root:asd123@localhost:3306/mydb");
// These are all the attributes in the User model
interface UserAttributes {
id: number;
name: string;
preferredName: string | null;
}
// Some attributes are optional in `User.build` and `User.create` calls
interface UserCreationAttributes extends Optional<UserAttributes, "id"> {}
class User extends Model<UserAttributes, UserCreationAttributes>
implements UserAttributes {
public id!: number; // Note that the `null assertion` `!` is required in strict mode.
public name!: string;
public preferredName!: string | null; // for nullable fields
// timestamps!
public readonly createdAt!: Date;
public readonly updatedAt!: Date;
// Since TS cannot determine model association at compile time
// we have to declare them here purely virtually
// these will not exist until `Model.init` was called.
public getProjects!: HasManyGetAssociationsMixin<Project>; // Note the null assertions!
public addProject!: HasManyAddAssociationMixin<Project, number>;
public hasProject!: HasManyHasAssociationMixin<Project, number>;
public countProjects!: HasManyCountAssociationsMixin;
public createProject!: HasManyCreateAssociationMixin<Project>;
// You can also pre-declare possible inclusions, these will only be populated if you
// actively include a relation.
public readonly projects?: Project[]; // Note this is optional since it's only populated when explicitly requested in code
public static associations: {
projects: Association<User, Project>;
};
}
interface ProjectAttributes {
id: number;
ownerId: number;
name: string;
description?: string;
}
interface ProjectCreationAttributes extends Optional<ProjectAttributes, "id"> {}
class Project extends Model<ProjectAttributes, ProjectCreationAttributes>
implements ProjectAttributes {
public id!: number;
public ownerId!: number;
public name!: string;
public readonly createdAt!: Date;
public readonly updatedAt!: Date;
}
interface AddressAttributes {
userId: number;
address: string;
}
// You can write `extends Model<AddressAttributes, AddressAttributes>` instead,
// but that will do the exact same thing as below
class Address extends Model<AddressAttributes> implements AddressAttributes {
public userId!: number;
public address!: string;
public readonly createdAt!: Date;
public readonly updatedAt!: Date;
}
// You can also define modules in a functional way
interface NoteAttributes {
id: number;
title: string;
content: string;
}
// You can also set multiple attributes optional at once
interface NoteCreationAttributes
extends Optional<NoteAttributes, "id" | "title"> {}
Project.init(
{
id: {
type: DataTypes.INTEGER.UNSIGNED,
autoIncrement: true,
primaryKey: true,
},
ownerId: {
type: DataTypes.INTEGER.UNSIGNED,
allowNull: false,
},
name: {
type: new DataTypes.STRING(128),
allowNull: false,
},
description: {
type: new DataTypes.STRING(128),
allowNull: true,
},
},
{
sequelize,
tableName: "projects",
}
);
User.init(
{
id: {
type: DataTypes.INTEGER.UNSIGNED,
autoIncrement: true,
primaryKey: true,
},
name: {
type: new DataTypes.STRING(128),
allowNull: false,
},
preferredName: {
type: new DataTypes.STRING(128),
allowNull: true,
},
},
{
tableName: "users",
sequelize, // passing the `sequelize` instance is required
}
);
Address.init(
{
userId: {
type: DataTypes.INTEGER.UNSIGNED,
},
address: {
type: new DataTypes.STRING(128),
allowNull: false,
},
},
{
tableName: "address",
sequelize, // passing the `sequelize` instance is required
}
);
// And with a functional approach defining a module looks like this
const Note: ModelDefined<
NoteAttributes,
NoteCreationAttributes
> = sequelize.define(
"Note",
{
id: {
type: DataTypes.INTEGER.UNSIGNED,
autoIncrement: true,
primaryKey: true,
},
title: {
type: new DataTypes.STRING(64),
defaultValue: "Unnamed Note",
},
content: {
type: new DataTypes.STRING(4096),
allowNull: false,
},
},
{
tableName: "notes",
}
);
// Here we associate which actually populates out pre-declared `association` static and other methods.
User.hasMany(Project, {
sourceKey: "id",
foreignKey: "ownerId",
as: "projects", // this determines the name in `associations`!
});
Address.belongsTo(User, { targetKey: "id" });
User.hasOne(Address, { sourceKey: "id" });
async function doStuffWithUser() {
const newUser = await User.create({
name: "Johnny",
preferredName: "John",
});
console.log(newUser.id, newUser.name, newUser.preferredName);
const project = await newUser.createProject({
name: "first!",
ownerId: 123,
});
const ourUser = await User.findByPk(1, {
include: [User.associations.projects],
rejectOnEmpty: true, // Specifying true here removes `null` from the return type!
});
// Note the `!` null assertion since TS can't know if we included
// the model or not
console.log(ourUser.projects![0].name);
}