22: json

src/productCategories/productCategory.entity.ts

@@ -0,0 +1,19 @@
+import { Column, Entity, PrimaryGeneratedColumn, OneToMany } from 'typeorm';
+import Product from '../products/product.entity';
+
+@Entity()
+class ProductCategory {
+    @PrimaryGeneratedColumn()
+    public id: number;
+
+    @Column()
+    public name: string;
+
+    @OneToMany(
+        () => Product,
+        (product: Product) => product.category,
+    )
+    public products: Product[];
+}
+
+export default ProductCategory;

src/products/product.entity.ts

@@ -0,0 +1,23 @@
+import { Column, Entity, PrimaryGeneratedColumn, ManyToOne } from 'typeorm';
+import ProductCategory from '../productCategories/productCategory.entity';
+import { CarProperties } from './types/carProperties.interface';
+import { BookProperties } from './types/bookProperties.interface';
+
+@Entity()
+class Product {
+    @PrimaryGeneratedColumn()
+    public id: number;
+
+    @Column()
+    public name: string;
+
+    @ManyToOne(() => ProductCategory, (category: ProductCategory) => category.products)
+    public category: ProductCategory;
+
+    @Column({
+        type: 'jsonb'
+    })
+    public properties: CarProperties | BookProperties;
+}
+
+export default Product;

src/products/types/bookProperties.interface.ts

@@ -0,0 +1,4 @@
+export interface BookProperties {
+    authors: string[];
+    publicationYear: string;
+}

src/products/types/carProperties.interface.ts

@@ -0,0 +1,7 @@
+export interface CarProperties {
+    brand: string;
+    engine: {
+        fuel: string;
+        numberOfCylinders: number;
+    }
+}