feat(medusa): Added models + repo for products in multiple categories (#3083)

* chore: Added models + repo for products in multiple categories

* chore: remove join table model + repo

* chore: add foreign key constraints

* Update packages/medusa/src/migrations/1674455083104-product_category_product.ts

Co-authored-by: Oliver Windall Juhl <59018053+olivermrbl@users.noreply.github.com>

* chore: cascade on delete

Co-authored-by: Oliver Windall Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/medusa/src/models/product-category.ts

@@ -1,6 +1,7 @@
 import { generateEntityId } from "../utils/generate-entity-id"
 import { SoftDeletableEntity } from "../interfaces/models/soft-deletable-entity"
 import { kebabCase } from "lodash"
+import { Product } from "."
 import {
   BeforeInsert,
   Index,
@@ -12,6 +13,8 @@ import {
   TreeParent,
   TreeLevelColumn,
   JoinColumn,
+  ManyToMany,
+  JoinTable,
 } from "typeorm"
 
 @Entity()
@@ -49,6 +52,20 @@ export class ProductCategory extends SoftDeletableEntity {
   @TreeChildren({ cascade: true })
   category_children: ProductCategory[]
 
+  @ManyToMany(() => Product, { cascade: ["remove", "soft-remove"] })
+  @JoinTable({
+    name: "product_category_product",
+    joinColumn: {
+      name: "product_id",
+      referencedColumnName: "id",
+    },
+    inverseJoinColumn: {
+      name: "product_category_id",
+      referencedColumnName: "id",
+    },
+  })
+  products: Product[]
+
   @BeforeInsert()
   private beforeInsert(): void {
     this.id = generateEntityId(this.id, "pcat")

packages/medusa/src/models/product.ts

@@ -17,6 +17,7 @@ import { ProductCollection } from "./product-collection"
 import { ProductOption } from "./product-option"
 import { ProductTag } from "./product-tag"
 import { ProductType } from "./product-type"
+import { ProductCategory } from "./product-category"
 import { ProductVariant } from "./product-variant"
 import { SalesChannel } from "./sales-channel"
 import { ShippingProfile } from "./shipping-profile"
@@ -77,6 +78,20 @@ export class Product extends SoftDeletableEntity {
   })
   variants: ProductVariant[]
 
+  @ManyToMany(() => ProductCategory, { cascade: ["remove", "soft-remove"] })
+  @JoinTable({
+    name: "product_category_product",
+    joinColumn: {
+      name: "product_category_id",
+      referencedColumnName: "id",
+    },
+    inverseJoinColumn: {
+      name: "product_id",
+      referencedColumnName: "id",
+    },
+  })
+  categories: ProductCategory[]
+
   @Index()
   @Column()
   profile_id: string