DRY article - ProductService

ProductService.ts

interface User {
    id: string;
    isAdmin: boolean;
}

interface Product {
    id: string;
    title: string;
}

class ProductService {
    private db: DB<Product>;

    constructor() {
        this.db = new DB<Product>('product');
    }

    async create(user: User, product: Product): Promise<Product | undefined> {
        if (user.isAdmin) {
            console.log(`Create product.`);
            return this.db.create({user, product});
        }
        return undefined;
    }
    
    async read(user: User, product: Product): Promise<Product | undefined> {
        console.log(`Get product`);
        return this.db.get({user, product});
    }

    async update(user: User, product: Product): Promise<Product | undefined> {
        if (user.isAdmin) {
            console.log(`Update product.`);
            return this.db.update({user, product});
        }
        return undefined;
    }

    async delete(user: User, product: Product): Promise<Product | undefined> {
        if (user.isAdmin) {
            console.log(`Delete product.`);
            return this.db.delete({user, product});
        }
        return undefined;
    }
}